U.S. patent application number 15/262395 was filed with the patent office on 2017-01-12 for sustained release of guaifenesin.
The applicant listed for this patent is Reckitt Benckiser LLC. Invention is credited to Ralph W. Blume, Robert D. Davis, Donald Jeffrey Keyser.
Application Number | 20170007543 15/262395 |
Document ID | / |
Family ID | 46204789 |
Filed Date | 2017-01-12 |
United States Patent
Application |
20170007543 |
Kind Code |
A1 |
Davis; Robert D. ; et
al. |
January 12, 2017 |
SUSTAINED RELEASE OF GUAIFENESIN
Abstract
The invention relates to a novel pharmaceutical sustained
release formulation of guaifenesin. The formulation may comprise a
hydrophilic polymer, preferably a hydroxypropyl methylcellulose,
and a water-insoluble polymer, preferably an acrylic resin, in a
ratio range of about one-to-one (1:1) to about nine-to-one (9:1),
more preferably a range of about three-to-two (3:2) to about
six-to-one (6:1), and most preferably in a range of about
two-to-one (2:1) to about four-to-one (4:1) by weight. This
formulation capable of providing therapeutically effective
bioavailability of guaifenesin for at least twelve hours after
dosing in a human subject. The invention also relates to a modified
release product which has two portions: a first portion having an
immediate release formulation of guaifenesin and a second portion
having a sustained release formulation of guaifenesin. The modified
release product has a maximum guaifenesin serum concentration
equivalent to that of an immediate release guaifenesin tablet, and
is capable of providing therapeutically effective bioavailability
of guaifenesin for at least twelve hours after dosing in a human
subject.
Inventors: |
Davis; Robert D.;
(Arlington, TX) ; Blume; Ralph W.; (Fort Worth,
TX) ; Keyser; Donald Jeffrey; (Southlake,
TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Reckitt Benckiser LLC |
Parsippany |
NJ |
US |
|
|
Family ID: |
46204789 |
Appl. No.: |
15/262395 |
Filed: |
September 12, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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12940781 |
Nov 5, 2010 |
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15262395 |
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10406557 |
Apr 4, 2003 |
7838032 |
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12940781 |
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10121706 |
Apr 15, 2002 |
6955821 |
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10406557 |
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09559542 |
Apr 28, 2000 |
6372252 |
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10121706 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61K 31/485 20130101;
A61K 9/5084 20130101; A61K 31/137 20130101; A61K 31/495 20130101;
A61K 9/2027 20130101; A61K 31/485 20130101; A61K 31/137 20130101;
A61K 31/495 20130101; A61K 9/2054 20130101; A61K 2300/00 20130101;
A61P 11/10 20180101; A61K 2300/00 20130101; A61K 2300/00 20130101;
A61K 31/09 20130101; A61K 9/2086 20130101; A61K 9/209 20130101 |
International
Class: |
A61K 9/20 20060101
A61K009/20; A61K 31/09 20060101 A61K031/09 |
Claims
1-36. (canceled)
37. A single dose drug product, comprising: 1200 mg total
guaifenesin in both first and second portions; said first portion
being an immediate release form that releases said guaifenesin in a
human subject's stomach; and said second portion being in a
sustained release form that releases said guaifenesin in a human
patient's intestine, said sustained release form being a matrix
comprising 0.5-4.0 wt % of a hydrophilic polymer and a
water-insoluble polymer having said second portion of guaifenesin
admixed therein, said hydrophilic polymer and said water-insoluble
polymer being present in a weight ratio of from 1:1 to 9:1, said
hydrophilic polymer being selected from the group consisting of
acacia, gum tragacanth, locust bean gum, guar gum, karaya gum,
methylcellulose, hydroxymethylcellulose, hydroxypropyl
methylcellulose, hydroxypropyl cellulose, hydroxyethylcellulose,
carboxymethylcellulose, agar, pectin, carrageen, alginate,
carboxypolymethylene, gelatin, casein, zein, bentonite, magnesium
aluminum silicate, polysaccharide, modified starch derivative and
combinations thereof, and said water-insoluble polymer being
selected from the group consisting of polyacrylic acids, acrylic
resins, acrylic latex dispersions, cellulose acetate phthalate,
polyvinyl acetate phthalate, hydroxypropyl methylcellulose
phthalate and combinations thereof, wherein from 63% to 72% of said
total amount of guaifenesin is absorbed into said human subject's
bloodstream within 3 hours after administration under fasted
conditions, guaifenesin is absorbed into the bloodstream such that
the single dose drug product can be appropriately dosed once in a
12-hour period, and said single dose drug product optionally
comprising at least one additional drug selected from the group
consisting of an antitussive, a decongestant, an antihistamine, an
analgesic and combinations thereof.
38. The drug product according to claim 37, wherein from 67% to 72%
of the total amount of guaifenesin absorbed into the bloodstream is
absorbed within 3 hours after administration under fasted
conditions.
39. The drug product according to claim 37, wherein 63% of the
total amount of guaifenesin absorbed into the bloodstream is
absorbed within 3 hours after administration under fasted
conditions.
40. The drug product according to claim 37, wherein 67% of the
total amount of guaifenesin absorbed into the bloodstream is
absorbed within 3 hours after administration under fasted
conditions.
41. The drug product according to claim 37, wherein 72% of the
total amount of guaifenesin absorbed into the bloodstream is
absorbed within 3 hours after administration under fasted
conditions.
42. The drug product according to claim 37, wherein the first and
second portions are discrete.
43. The drug product according to claim 42, which is in a form of a
bi-layer tablet.
44. The drug product according to claim 42, wherein said first and
second portions are both in the form of beads or granules.
45. The drug product according to claim 42, wherein said
hydrophilic polymer and said water-insoluble polymer are present in
a weight ratio of from 3:2 to 6:1.
46. The drug product according to claim 42, wherein said
hydrophilic polymer and said water-insoluble polymer are present in
a weight ratio of from 2:1 to 4:1.
47. The drug product according to claim 37, which comprises more
than 0.5 and less than 10 total wt. % of said hydrophilic
polymer.
48. The drug product according to claim 45, which comprises more
than 1 and less than 7 total wt. % of said hydrophilic polymer.
49. The drug product according to claim 46, which comprises more
than 2 and less than 6 total wt. % of said hydrophilic polymer.
50. The drug product according to claim 47, which comprises more
than 0.5 and less than 2.5 total wt. % of said water insoluble
polymer.
51. The drug product according to claim 48, which comprises more
than 0.75 and less than 1.5 total wt. % of said water insoluble
polymer.
52. The drug product according to claim 49, which comprises more
than 0.9 and less than 1.25 total wt. % of said water insoluble
polymer.
53. The drug product according to claim 51, wherein said matrix
comprises 1 to 2 wt. % of said hydrophilic polymer.
54. The drug product according to claim 52, wherein said matrix
comprises 1 to 2 wt. % of said hydrophilic polymer.
55. The drug product according to claim 45, wherein said
hydrophilic polymer is selected from the group consisting of
methylcellulose, hydroxymethylcellulose, hydroxypropyl methyl
cellulose, hydroxypropyl cellulose, hydroxyethylcellulose,
carboxymethyl cellulose and combinations thereof.
56. The drug product according to claim 46, wherein said
hydrophilic polymer comprises hydroxypropyl methylcellulose.
57. The drug product according to claim 54, wherein said
hydrophilic polymer is selected from the group consisting of
methylcellulose, hydroxymethylcellulose, hydroxypropyl methyl
cellulose, hydroxypropyl cellulose, hydroxyethylcellulose,
carboxymethyl cellulose and combinations thereof.
58. The drug product according to claim 57, wherein said sustained
release form comprises 75 to 95 weight percent guaifenesin.
59. The drug product according to claim 58, wherein said immediate
release form comprises 47 to 58 weight percent guaifenesin.
60. The drug product according to claim 59, wherein said sustained
release form comprises 75 to 80 weight percent guaifenesin.
61. The drug product according to claim 60, comprising said
additional drug, wherein said additional drug is selected from the
group consisting of dextromethorphan hydrobromide, codeine,
hydrocodone, phenylephrine hydrochloride, phenylpropanolamine
hydrochloride, pseudoephedrine hydrochloride, ephedrine,
chlorpheniramine maleate, brompheniramine maleate, phenindamine
tartrate, pyrilamine maleate, doxylamine succinate,
phenyltoloxamine citrate, diphenhydramine hydrochloride,
promethazine, clemastine fumarate, aspirin, ibuprofen, naprosin,
acetaminophen and combinations thereof.
62. The drug product according to claim 61, wherein said additional
drug is contained within said sustained release form.
63. The drug product according to claim 61, wherein said additional
drug is contained within said immediate release form.
64. The drug product according to claim 61, wherein the ratio of
total guaifenesin to said at least one additional drug is 1:1 to
20:1 by weight.
65. The drug product according to claim 64, wherein the ratio of
total guaifenesin to said at least one additional drug is 2:1 to
15:1 by weight.
66. The drug product according to claim 65, wherein the ratio of
total guaifenesin to said at least one additional drug is 8:1 to
12:1 by weight.
67. The drug product according to claim 37, wherein the ratio of
guaifenesin in the sustained release form to the guaifenesin in the
immediate release form is 1:1 to 15:1 by weight.
68. The drug product according to claim 67, wherein the ratio of
guaifenesin in the sustained release form to the guaifenesin in the
immediate release form is 3:2 to 11:1 by weight.
69. The drug product according to claim 68, wherein the ratio of
guaifenesin in the sustained release form to the guaifenesin in the
immediate release form is 5:1 to 9:1 by weight.
70. The drug product according to claim 67, wherein the ratio of
said at least one additional drug in the sustained release form to
said at least one additional drug in the immediate release form is
1:1 to 19:1 by weight.
71. The drug product according to claim 68, wherein the ratio of
said at least one additional drug in the sustained release form to
said at least one additional drug in the immediate release form is
3:2 to 9:1 by weight.
72. The drug product according to claim 69, wherein the ratio of
said at least one additional drug in the sustained release form to
said at least one additional drug in the immediate release form is
3:1 to 4:1 by weight.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 10/406,557, filed Apr. 4, 2003, which is a
continuation-in-part of U.S. patent application Ser. No.
10/121,706, filed Apr. 15, 2002, now U.S. Pat. No. 6,955,821, which
is a continuation-in-part of U.S. patent application Ser. No.
09/559,542, filed Apr. 28, 2000, now U.S. Pat. No. 6,372,252. All
prior applications are hereby incorporated in their entirety by
reference.
BACKGROUND OF THE INVENTION
[0002] The invention is directed to a sustained release formulation
for oral administration comprising guaifenesin and optionally at
least one additional drug and methods of manufacture thereof. In
particular, the invention is directed to a sustained release
formulation which maintains a therapeutically effective blood
concentration of guaifenesin and optionally the additional drug for
a duration of about twelve hours. The invention further relates to
formulations which demonstrate a maximum serum concentration
equivalent to an immediate release tablet, while maintaining
therapeutically effective blood concentration for about twelve
hours.
[0003] Sustained release pharmaceutical formulations provide a
significant advantage over immediate release formulations to both
clinicians and their patients. Sustained release dosage forms
provide for fewer daily dose administrations than their immediate
release counterparts. For example, a standard dosage regimen for a
400 mg immediate release drug with a short half-life, such as
guaifenesin, requires administration three times within twelve
hours to maintain adequate bioavailability to achieve the desired
therapeutic effect. This results in a series of three serum
concentration profiles in the patient showing a rapid increase of
drug followed by a similar rapid decrease. As a result, patients
are provided with only a short window of the appropriate blood
concentration of the medicament for optimum therapy. A 1200 mg
sustained release dosage form, on the other hand, may require
administration once every twelve hours to achieve therapeutic
effect. Sustained release dosage forms generally control the rate
of drug absorption, to avoid excessive drug absorption while
maintaining effective blood concentration of the drug to provide a
patient with a consistent therapeutic effect over an extended
duration of time.
[0004] Besides reducing the frequency of dosing and providing a
more consistent therapeutic effect, sustained release dosage forms
generally help reduce side effects caused by a drug. Because
sustained release dosage forms deliver the drug in slow,
incremental amounts versus the cyclic high and low concentrations
of immediate release formulations, it is easier for a patient's
body to digest the drug, thereby avoiding undesirable side-effects.
For patients who self-administer therapies, sustained release
dosage forms generally result in greater compliance due to the
lower frequency of dosing, lower quantity of dosage units to be
consumed, and reduced undesired side-effects.
[0005] Generally, sustained release formulations contain drug
particles mixed with or covered by a polymer material, or blend of
materials, which is resistant to degradation or disintegration in
the stomach and/or in the intestine for a selected period of time.
Release of the drug may occur by leeching, erosion, rupture,
diffusion or similar actions depending upon the nature of the
polymer material or polymer blend used.
[0006] Conventionally, pharmaceutical manufacturers have used
hydrophilic hydrocolloid gelling polymers such as hydroxypropyl
methylcellulose, hydroxypropyl cellulose, or Pullulan to formulate
sustained release tablets or capsules. These polymers first form a
gel when exposed to an aqueous environment of low pH thereby slowly
diffusing the active medicament which is contained within the
polymer matrix. When the gel enters a higher pH environment such as
that found in the intestines, however, it dissolves resulting in a
less controlled drug release. To provide better sustained release
properties in higher pH environments, some pharmaceutical
manufacturers use polymers which dissolve only at higher pHs, such
as acrylic resins, acrylic latex dispersions, cellulose acetate
phthalate, and hydroxypropyl methylcellulose phthalate, either
alone or in combination with hydrophilic polymers.
[0007] Generally, these formulations are prepared by combining the
medicament with a finely divided powder of the hydrophilic polymer,
or the hydrophilic and water-insoluble polymers. These ingredients
are mixed and granulated with water or an organic solvent and the
granulation is dried. The dry granulation is then usually further
blended with various pharmaceutical additives and compressed into
tablets.
[0008] Although these types of formulations have been successfully
used to manufacture dosage forms which demonstrate sustained
release properties, these formulations generally do not have the
desired release profile or serum concentration of medicament over
an extended period of time. These sustained release formulations
generally result in a delay in the appearance of drug in the blood
stream, thereby delaying therapeutic effect. Additionally, when the
drug does appear, its maximum serum concentration (C.sub.max) is
lower than the maximum concentration required for the most
effective therapeutic result. Furthermore, most formulations which
claim twelve hour potency release almost all of their drug within
six to eight hours, making the formulation less therapeutically
effective towards the end of the twelve hour period. To prevent
blood serum concentrations of drug from falling below a
therapeutically effective level (C.sub.min) at extended time
periods, many manufacturers increase the drug strength of the
dosage form. The increase in drug strength, however, results in a
concomitant increase in side-effects.
[0009] Other pharmaceutical manufacturers have made tablets and
capsules containing a combination of an immediate release
formulation and a sustained release formulation to improve the
release profile of certain sustained release dosage forms. Although
this solution improves the C.sub.max and length of time before the
drug appears in the blood stream in some formulations, the extended
therapeutic effect is not improved.
[0010] Furthermore, medicaments have different solubility
properties and pH dependencies which affect dissolution rate and
bioavailability. Bioavailability can also be affected by a number
of factors such as the amounts and types of adjuvants used, the
granulation process, compression forces (in tablet manufacturing),
surface area available for dissolution and environmental factors
such as agitation in the stomach and the presence or absence of
food. Due to these numerous factors, specific formulations play an
important role in the preparation of prolonged action solid dosage
forms, particularly in the preparation of solid dosage forms which
achieve appropriate bioavailability for optimum therapeutic
effect.
[0011] Guaifenesin, 3-(2-methoxyphenoxy)-1,2-propanediol, is an
expectorant which increases respiratory tract fluid secretions and
helps to loosen phlegm. By reducing the viscosity of secretions,
guaifenesin increases the efficiency of a cough reflex and of
ciliary action in removing accumulated secretions from trachea and
bronchi. Guaifenesin is readily absorbed from the intestinal tract
and is rapidly metabolized and excreted in urine. guaifenesin has a
typical plasma half-life of approximately one hour. The rapid
metabolism and excretion of guaifenesin provides only a short
window of therapeutic effectiveness when immediate release dosage
is used.
[0012] Pseudoephedrine hydrochloride is an orally active
sympathomimetic amine and exerts a decongestant action on the nasal
mucosa. Pseudoephedrine produces peripheral effects similar to
those of ephedrine and central effects similar to, but less intense
than, amphetamines. It has the potential for excitatory effects. At
the recommended oral dose, it has little or no pressor effect in
normotensive adults. Pseudoephedrine has been shown to have a mean
elimination half-life of 4-6 hours.
[0013] The need exists for a sustained release dosage form of
guaifenesin alone and in combinations which are capable of
sustaining therapeutic effective for extended periods of time.
Further the need exists for sustained release dosage forms of
guaifenesin alone and in combination which results in a C.sub.max
equivalent to that of an immediate release formulation, appears in
the blood stream as quickly as an immediate release formulation,
and sustains the therapeutic effect.
SUMMARY OF THE INVENTION
[0014] The invention relates to strategies and designs in
formulations of modified release guaifenesin and guaifenesin
combination dosage forms. This invention provides sustained release
pharmaceutical formulation comprising guaifenesin and at least one
additional drug. The sustained release formulation (SR) may
comprise a combination of at least one hydrophilic polymer and at
least one water-insoluble polymer. The total weight ratio of
hydrophilic polymer to water-insoluble polymer may be in a range of
about one-to-one (1:1) to about nine-to-one (9:1), more preferably
in a range of about three-to-two (3:2) to about six-to-one (6:1),
and most preferably in a range of about two-to-one (2:1) to about
four-to-one (4:1). When a tablet comprising the sustained release
formulation is exposed to an aqueous medium of low pH, such as that
found in the stomach, the polymer combination gels causing
guaifenesin and the drug(s) to diffuse from the gel. When the
tablet passes to the intestines where an aqueous medium of higher
pH is present, the gel begins to dissolve, thereby releasing
guaifenesin and/or the drug(s) in controlled amounts. The tablet is
capable of releasing therapeutically effective amounts of
guaifenesin over an extended period, e.g. twelve or more hours and
at least one additional drug immediately, over an extended period,
or both.
[0015] This invention also encompasses a modified release
composition which comprises two portions (e.g. a bi-layer tablet,
or capsule), an immediate release formulation (IR) and a sustained
release formulation (SR). Each formulation comprises a specific
quantity of guaifenesin and may optionally contain at least one
additional drug. The immediate release formulation is formulated to
dissolve in aqueous acidic medium, such as that found in the
stomach, to quickly release guaifenesin contained within the
portion, and optionally quickly release the at least one additional
drug. The sustained release portion may comprise a combination of
hydrophilic polymer and a water-insoluble polymer in a ratio range
of about one-to-one (1:1) to about nine-to-one (9:1), more
preferably a range of about three-to-two (3:2) to about six-to-one
(6:1), and most preferably from about two-to-one (2:1) to about
four-to-one (4:1). Likewise, the sustained release portion may also
contain the additional drug(s).
[0016] The invention also relates to sustained release preparations
of the type described above in the form of capsules having beads or
granules of both immediate release formulation and beads or
granules of sustained release formulation. The beads may comprise a
mixture of discrete beads each having only one of the SR or IR
formulations or may comprise beads containing both SR and IR
formulations associated in a single bead, or combinations of the
foregoing. Alternatively, the sustained release formulation may
comprise a core that is coated by a layer of the immediate release
formulation to form a single tablet. For purpose of illustration
only, the invention will be described in detail in the context of
the bi-layered tablet embodiment. It should be understood that for
either the immediate release and/or the sustained release portion
the guaifenesin and optionally the additional drug may be mixed
within the same matrix portion or comprise separate release
portions which are then either compressed or mixed for capsules
(e.g. comprise separate beads or granules) etc.
[0017] A bi-layer tablet demonstrates a maximum serum concentration
(C.sub.max) and time of availability in the blood stream that are
equivalent to an immediate release tablet. The bi-layer tablet also
provides sustained release of guaifenesin over about a twelve hour
period from one dose. The bi-layer tablet further maintains serum
concentration levels of guaifenesin at a therapeutically effective
level for about a twelve hour period without an increase in dosage
strength. As the bi-layer tablet may also contain at least one
additional drug, the additional drug can be formulated within the
sustained release formulation, immediate release formulation, or
both. In one embodiment, the bi-layer tablet maintains serum
concentration levels of at least one additional drug at a
therapeutically effective level for about a twelve hour period
without an increase in dosage strength.
[0018] In another embodiment, the tablets and capsules of the
invention provide a C.sub.min which is above the necessary
therapeutically effective level for a period of 10 hours, more
preferably 12 or more hours. In a more preferred embodiment, a
tablet or capsule of the invention provides the above describe
C.sub.min characteristics and provides the necessary C.sub.max to
mimic a immediate release product to obtain symptom relief. In a
more preferred embodiment, the delivery system provides the above
describe C.sub.min characteristics and provides the necessary
C.sub.max to mimic a immediate release product to obtain symptom
relief within a substantially similar T.sub.max period to a
immediate release profile.
[0019] In another embodiment of the invention, the delivery system
provides a C.sub.max which does not result in a equivalent
C.sub.max of an immediate release product but does provide a
C.sub.max which is therapeutically effect to relieve systems while
reducing the likelihood of side effects due to an increased
C.sub.max.
[0020] The invention also relates to methods of manufacturing
sustained release formulations and bi-layer tablets. An example of
a manufacturing method for a sustained release formulation
comprises mixing a hydrophilic polymer and active ingredients in a
mixer, adding water to the mixture and continuing to mix and chop,
drying the mixture to obtain hydrophilic polymer encapsulated
granules, milling and screening the resulting granulation, and
blending it with various pharmaceutical additives, additional
hydrophilic polymer, and water insoluble polymer. The formulation
may then be tableted and may further be film coated with a
protective coating which rapidly dissolves or disperses in gastric
juices.
[0021] An example of a bi-layer tablet manufacturing method
comprises blending a quantity of guaifenesin and optionally, at
least one drug with various excipients, colorants, and/or other
pharmaceutical additives to form an immediate release formulation,
separately blending another quantity of guaifenesin and optionally
at least one drug with a hydrophilic polymer, a water-insoluble
polymer, and various excipients, colorants, and/or other
pharmaceutical additives to form a sustained release formulation,
and compressing a quantity of the immediate release formulation
with a quantity of the sustained release formulation to form a
bi-layer tablet. The tablet may then optionally be coated with a
protective coating which rapidly dissolves or disperses in gastric
juices.
[0022] Other objects, advantages and embodiments of the invention
are described below and will be obvious from this description and
practice of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] FIG. 1 is a flow diagram depicting steps in a wet
granulation method for manufacturing the sustained release
formulation.
[0024] FIG. 2 is a flow diagram depicting steps in a dry
granulation method for manufacturing the sustained release
formulation.
[0025] FIG. 3 is a flow diagram depicting steps in a method for
manufacturing the bi-layer tablet.
[0026] FIG. 4 is a graph demonstrating the dissolution profiles of
tablets comprising two different sustained release
formulations.
[0027] FIG. 5 is a graph demonstrating the dissolution profiles of
a commercially available immediate release dosage form and two
sustained release dosage forms of guaifenesin.
[0028] FIG. 6 is a graph demonstrating the plasma concentration of
guaifenesin over time in healthy human volunteers who were dosed
with three different guaifenesin formulations; a commercial
immediate release formulation, and two different sustained release
formulations (Lot 7B-32 and Lot 7B-31).
[0029] FIG. 7 is a graph demonstrating the plasma concentration of
guaifenesin over time in healthy human volunteers from a
commercially available immediate release tablet, a non-layered
modified release tablet of the invention, and two bi-layered
modified release tablets of the invention (one comprising 600 mg of
immediate release formulation and 600 mg of sustained release
formulation and the other one comprising 400 mg of immediate
release formulation and 800 mg of sustained release
formulation).
[0030] FIG. 8 is a graph demonstrating the dissolution profiles of
four sustained release tablets: one tablet is non-layered,
comprising 1200 mg of sustained release formulation; another tablet
is bi-layered, comprising 600 mg of sustained release formulation
and 600 mg of immediate release formulation; another tablet is
bi-layered, comprising 800 mg of sustained release formulation and
400 mg of immediate release formulation; and yet another tablet is
bi-layered comprising 1000 mg of sustained release formulation and
200 mg of immediate release formulation.
[0031] FIG. 9 is a graph demonstrating the plasma concentration of
guaifenesin over an averaged 12 hour interval (taken from 11 twelve
hour intervals over 5.5 days) in healthy human volunteers from an
immediate release tablet and a bi-layered modified release tablet
of the invention.
[0032] FIG. 10 is a graph demonstrating the plasma concentration of
guaifenesin over time (the last twelve hour interval of the 11
twelve hour intervals described above) in healthy human volunteers
from an immediate release tablet and a bi-layered modified release
tablet of the invention.
[0033] FIG. 11 is a graph demonstrating the averaged plasma
concentration of guaifenesin over a 16 hour period in 27 healthy
human volunteers from 600 mg bi-layered modified release tablets of
the invention administered to fasting volunteers, 1200 mg
bi-layered modified release tablets of the invention administered
to fasting volunteers, and 1200 mg bi-layered modified release
tablets of the invention administered to volunteers who had been
fed a high fat meal.
[0034] FIG. 12 is a graph demonstrating the dissolution profile of
dextromethorphan HBr as measured by three different batches of a
1200 mg guaifenesin-60 mg dextromethorphan tablet over a 12 hour
period as measured by the weight percentage of dextromethorphan HBr
dissolved over time.
[0035] FIG. 13 is a graph demonstrating the plasma concentration of
guaifenesin following the administration of 1200 mg guaifenesin and
60 mg dextromethorphan HBr to volunteers separately and in
formulations of the invention.
[0036] FIG. 14 is a graph demonstrating the plasma concentrations
of dextromethorphan HBr following the administration of 1200 mg
guaifenesin and 60 mg dextromethorphan HBr to volunteers in three
different formulations.
[0037] FIG. 15 is a graph demonstrating the plasma concentrations
of the metabolite dextrorphan following the administration of 1200
mg guaifenesin and 60 mg dextromethorphan HBr to volunteers in
three different formulations.
[0038] FIG. 16 is a graph demonstrating the dissolution profile of
pseudoephedrine HCl in three different batches of a 1200 mg
guaifenesin-120 mg pseudoephedrine HCl tablet formulation over a 12
hour period as measured by the percent pseudoephedrine HCl
dissolved over time.
[0039] FIG. 17 is a graph demonstrating the plasma concentration of
guaifenesin following the administration of 1200 mg guaifenesin and
120 mg pseudoephedrine HCl to volunteers separately and in
formulations of the invention.
[0040] FIG. 18 is a graph demonstrating the plasma concentration of
pseudoephedrine HCl following the administration of 1200 mg
guaifenesin and 120 mg pseudoephedrine HCl to volunteers in three
different formulations.
[0041] FIG. 19 is a graph demonstrating the plasma concentration of
three different 1200 mg guaifenesin dosages in groups A, B, and C
of example 12.
[0042] FIG. 20 is a graph demonstrating the plasma concentration of
three different 120 mg pseudoephedrine dosages in groups A, B, and
C of example 12.
[0043] FIG. 21 is a graph demonstrating the plasma concentration of
three different 1200 mg guaifenesin dosages for treatments A, B,
and C of example 13.
[0044] FIG. 20 is a graph demonstrating the plasma concentration of
three different 120 mg pseudoephedrine dosages for treatments A, B,
and C of example 13.
[0045] FIG. 21 depicts guaifenesin concentrations of various
formulations and dosage strength.
[0046] FIG. 22 depicts pseudoephedrine plasma concentrations
following administration of two different dose strengths of
pseudoephedrine, as well as, different formulations.
[0047] FIG. 23 depicts guaifenesin concentrations following
administration of 1200 mg of guaifenesin with 120 mg
pseudoephedrine hydrochloride in two different formulations
following a high-fat meal.
[0048] FIG. 24 depicts pseudoephedrine concentrations following
administration of 1200 mg of guaifenesin with 120 mg
pseudoephedrine hydrochloride in two different formulations
following a high-fat meal.
[0049] FIG. 25 depicts steady-state guaifenesin plasma
concentrations following administration of 11 doses of 120 mg
pseudoephedrine with 1200 mg of guaifenesin in two different
formulations.
[0050] FIG. 26 depicts steady-state pseudoephedrine plasma
concentrations following administration of 11 doses of 120 mg
pseudoephedrine with 1200 mg of guaifenesin in two different
formulations.
[0051] FIG. 27 depicts guaifenesin plasma concentrations following
administration of 1200 mg of guaifenesin with and without the
co-administration of 120 mg of pseudoephedrine.
[0052] FIG. 28 depicts pseudoephedrine plasma concentrations
following administration of 120 mg of pseudoephedrine with and
without the co-administration of 1200 mg of guaifenesin.
[0053] FIG. 29 depicts guaifenesin plasma concentrations following
administration of an experimental 1200 mg guaifenesin-120 mg
pseudoephedrine formulation to volunteers under fed and fasted
conditions.
[0054] FIG. 30 depicts pseudoephedrine plasma concentrations
following administration of an experimental 1200 mg guaifenesin-120
mg pseudoephedrine formulation to volunteers under fed and fasted
conditions.
[0055] FIG. 31 depicts guaifenesin dissolution profiles for various
batches associated with the studies.
[0056] FIG. 32 depicts pseudoephedrine dissolution profiles for
various batches associated with the studies.
[0057] FIG. 33 depicts a process flow diagram for the manufacture
of guaifenesin DC (95%).
[0058] FIG. 34 depicts a process flow diagram for a
guaifenesin/pseudoephedrine product (1200/120 mg) tablets.
[0059] FIG. 35 depicts a process flow diagram for
guaifenesin/pseudoephedrine product (600/60 mg) tablets.
DETAILED DESCRIPTION OF THE INVENTION
[0060] The invention relates to sustained release formulations of
guaifenesin. In a preferred embodiment, the formulations also
comprise at least one additional drug in immediate release form,
sustained release form, or both. Each formulation comprises a
specific quantity of guaifenesin and may optionally contain at
least one additional drug. The immediate release formulation is
formulated to dissolve in aqueous acidic medium, such as that found
in the stomach, to provide rapid release of the guaifenesin and
optionally the at least one additional drug. In a preferred
embodiment, the sustained release formulation comprises a
combination of a hydrophilic polymer and a water-insoluble polymer
in a ratio range of about one-to-one (1:1) to about nine-to-one
(9:1), more preferably a range of about three-to-two (3:2) to about
six-to-one (6:1), and most preferably in a range of about
two-to-one (2:1) to about four-to-one (4:1).
[0061] In a preferred embodiment the hydrophilic polymers are
selected from acacia, gum tragacanth, locust bean gum, guar gum, or
karaya gum, methylcellulose, hydroxomethylcellulose, hydroxypropyl
methylcellulose, hydroxypropyl cellulose, hydroxyethylcellulose,
carboxymethylcellulose, agar, pectin, carrageen, alginates,
carboxypolymethylene, gelatin, casein, zein, bentonite, magnesium
aluminum silicate, polysaccharides, and modified starch
derivatives. In a more preferred embodiment the hydrophilic
polymers are selected from cellulose ethers. In a most preferred
embodiment the hydrophilic polymers are selected from hydroxypropyl
methylcelluloses such as Methocel (E10M). Preferred total amounts
of the hydrophilic polymer include more than 0.5% and less than 10%
by weight for a 1200 mg tablet. More preferably hydrophilic polymer
amounts includes more than 1.0% and less than 7.0%, more than 2%
and less than 6.0%. These amounts include the hydrophilic polymer
in the Guaifenesin DC described below. The hydrophilic polymer
added separately to form the release-delaying matrix is preferably
from about 0.5% to 4.0% and more preferably from about 1.0% to
2.0%. It should be recognized that these amounts may be
proportionally present in a 600 mg tablet or any desired
formulation strength.
[0062] In a preferred embodiment the water-insoluble polymers are
selected from polyacrylic acids, acrylic resins, acrylic latex
dispersions, cellulose acetate phthalate, polyvinyl acetate
phthalate, hydroxypropyl methylcellulose phthalate. In a more
preferred embodiment the water-insoluble polymers are selected from
acrylic resins. In a most preferred embodiment the water-insoluble
polymers are selected from Carbomer acrylic resins such as Carbomer
934P. Preferred amounts of the water-insoluble polymer include more
than about 0.5% and less than about 2.5% by weight for a 1200 mg
tablet. More preferably hydrophilic polymer amounts includes more
than about 0.75% and less than about 1.5%, and most preferably more
than about 0.9% and less than 1.25%. It should be recognized that
these amounts may be proportionally present in a 600 mg tablet or
any desired formulation strength.
[0063] The invention also relates to sustained release preparations
of the type described above in the form of bi-layered tablets or
capsules having a combination of beads or granules of immediate
release formulation and beads or granules of sustained release
formulation. Alternatively, the sustained release formulation may
comprise a core that is coated by a layer of immediate release
formulation to form a single tablet. For purpose of illustration
only, the invention will be described in detail in the context of
the bi-layered tablet embodiment. When the embodiment is a
bi-layered tablet, the tablet is made of two portions: one portion
comprising a sustained release formulation and a second portion
comprising an immediate release formulation. In a preferred
embodiment, the at least one additional drug can be present within
the sustained release formulation, the immediate release
formulation, or both depending upon the desired effect.
[0064] For instance, in a preferred embodiment of the present
invention has the following ingredients and proportions in the
sustained release layer (mg/tablet): 1052.6 mg Guaifenesin DC (95%)
[1000.0 mg of Guaifenesin, USP and 52.6 mg of hydroxypropyl
methylcellulose, USP]; 120.0 mg Pseudoephedrine HCL, USP; 30.0 mg
hydroxypropyl methylcellulose, USP [Methocel E10M, USP]; 15.0 mg
Carbomer 934P, NF [Carbopol 974P]; 0.4 mg FD&C Red #40 Aluminum
Lake (14-16%); and 10.0 mg magnesium stearate, NF for a total
sustained release weight of 1228.0 mg. In a preferred embodiment
the immediate release layer has the following proportions: 210.5 mg
Guaifenesin DC (95%) [200.0 mg of guaifenesin, USP and 10.5 mg of
hydroxypropyl methylcellulose, USP]; 117.5 mg of microcrystalline
cellulose, NF [Avicel PH102]; 30.0 mg of sodium starch glycolate,
NF [EXPLOTAB]; and 1.0 mg magnesium stearate, NF for a total
immediate release weight of 359.0 mg.
[0065] In another preferred embodiment a 1200 mg Guaifenesin/120 mg
Pseudoephedrine Tablet has the following ingredients and
proportions:
TABLE-US-00001 Representative Representative Amount Batch
(kg).sup.1 Batch (kg).sup.1 Component (mg/tablet) IR Layer SR Layer
Guaifenesin DC (95%).sup.2 1263.1 280.00 947.376 Hydroxypropyl 30.0
N/A 27.000 methylcellulose (Methocel .TM.) Pseudoephedrine 120.0
N/A 108.0 hydrochloride Microcrystalline 117.50 156.28 N/A
cellulose Sodium starch glycolate 30.0 39.90 N/A Carbomer 934P 15.0
N/A 13.500 Magnesium stearate 11.0 1.33 9.000 FD&C Red #40 0.4
N/A 0.360 Aluminum Lake (14-16%) Water, purified N/A.sup.3
N/A.sup.3 N/A.sup.3 Total Weight 1587.0 477.51 1105.236 .sup.1Based
on batch size of 900,000 tablets .sup.2Guaifenesin direct
compression used in the manufacturing process consists of 95%
Guaifenesin, USP, 5% hydroxpropyl methylcellulose, USP (Methocel
.TM. E10M) granulated with Purified water, USP (49.21 Kg).
.sup.3Water is removed during processing of Guaifenesin DC 95%.
[0066] In another preferred embodiment a 600 mg Guaifenesin/60 mg
Pseudoephedrine Tablet has the following ingredients and
proportions:
TABLE-US-00002 Representative Representative Amount Batch
(kg).sup.1 Batch (kg).sup.1 Component (mg/tablet) IR Layer SR Layer
Guaifenesin DC (95%).sup.2 631.55 280.00 947.376 Hydroxypropyl 15.0
N/A 27.000 methylcellulose (Methocel .TM.) Pseudoephedrine 60.0 N/A
108.0 hydrochloride, USP Microcrystalline 58.75 156.28 N/A
cellulose Sodium starch glycolate 15.0 39.90 N/A Carbomer 934P 7.5
N/A 13.500 Magnesium stearate 5.50 1.33 9.000 D&C Yellow #6 0.8
N/A 1.440 Aluminum Lake (15-18%) Water, purified N/A.sup.3
N/A.sup.3 N/A.sup.3 Total Weight 794.1 477.51 1106.316 .sup.1Based
on batch size of 1,800,000 tablets .sup.2guaifenesin direct
compression used in the manufacturing process consists of 95%
guaifenesin, USP, 5% hydroxpropyl methylcellulose, USP (Methocel
.TM. E10M) granulated with purified water, USP (49.21 Kg).
.sup.3Water is removed during processing of Guaifenesin DC 95%.
[0067] In another example, a 1200 mg Guaifenesin/120 mg
Pseudoephedrine Tablet may also have the following properties:
TABLE-US-00003 Description 1200 mg bi-layer tablet Average Tablet
Weight 1587.0 mg .+-. 3% (1539.4 mg-1634.6 mg) Tablet Thickness
0.321''-0.341'' Tablet Hardness 25-45 SCU Friability NMT 0.8% Loss
on Drying NMT 2.0% (moisture) NMT 31.74 mg/unit dose
Assay-guaifenesin 1140.0-1260.0 mg/tablet (95.0-105.0%)
Assay-Pseudoephedrine 116.6 to 128.4 mg/tablet hydrochloride
(93.0-107.0%) Guaifenesin The retention time of the peak obtained
from the Assay Identification A preparation matches that of the
Standard preparation. Guaifenesin (Identification B) A deep-cherry
red to purpose color is produced. Pseudoephedrine hydrochloride The
retention time of the peak obtained from the Assay Identification A
preparation matches that of the Standard preparation.
Pseudoephedrine hydrochloride The IR spectrum matches that of the
standard in the 2510 cm.sup.-1 to Identification B 2400 range
cm.sup.-1. Dose Uniformity % RSD NMT 6.0% (% RSD NMT 7.8% for Level
II) All individual values between 85.0-115.0% (For Level II, one
value is allowed outside 85.0-115.0%, but none outside 75.0-125.0%)
Dissolution: 1 Hour: NMT 45% Guaifenesin 2 Hour: 36-56% 6 Hour:
61-81% 12 Hour: NLT 85% Dissolution: 1 Hour: NMT 53%
Pseudoephedrine hydrochloride 2 Hour: 48-68% 6 Hour: NLT 75% 12
Hour: NLT 85%
[0068] In another example, a 600 mg Guaifenesin/60 mg
Pseudoephedrine Tablet may also have the following properties:
TABLE-US-00004 Description 600 mg bi-layer tablet Average Tablet
Weight 794.1 mg .+-. 3% (766.4 mg-821.8 mg) Tablet Thickness
0.247''-0.262'' Tablet Hardness 17-32 SCU Friability NMT 0.8% Loss
on Drying NMT 2.0% (moisture) NMT 15.88 mg/unit dose
Assay-Guaifenesin 570.0-630.0 mg/tablet(95.0-105.0%)
Assay-Pseudoephedrine 58.2 to 61.8 mg/tablet hydrochloride
(93.0-107.0%) Guaifenesin The retention time of the peak obtained
from the Assay Identification A preparation matches that of the
Standard preparation. Guaifenesin A deep-cherry red to purpose
color is produced. Identification B Pseudoephedrine hydrochloride
The retention time of the peak obtained from the Assay
Identification A preparation matches that of the Standard
preparation. Pseudoephedrine hydrochloride The IR spectrum matches
that of the standard in the 2510 cm.sup.-1 to Identification B 2400
range cm.sup.-1. Dose Uniformity % RSD NMT 6.0% (% RSD NMT 7.8% for
Level II) All individual values between 85.0-115.0% (For Level II,
one value is allowed outside 85.0-115.0%, but none outside
75.0-125.0%) Dissolution: 1 Hour: NMT 48% Guaifenesin 2 Hour:
41-61% 6 Hour: 73-93% 12 Hour: NLT 90% Dissolution: 1 Hour: NMT 58%
Pseudoephedrine hydrochloride 2 Hour: 56-76% 6 Hour: NLT 80% 12
Hour: NLT 85%
[0069] Embodiments of the invention, include a SCU that is
preferably less than 43, more preferably less than 41, more
preferably less than 38, more preferably less than 37, and more
preferably between 32 and 35. SCU is also preferably greater than
21, more preferably greater than 24, more preferably greater than
28, and more preferably greater than 31.
[0070] The weight of 10 bi-layer tablets (1200 mg/120 mg) is
preferably less than 16.4 g, more preferably less than 16.35 g,
more preferably less than 16.29 g, more preferably less than 16.22
g, more preferably less than 16.16 g, more preferably less than
16.10 g, more preferably less than 16.04 g, and more preferably
between 15.71 g and 16.03 g. The weight of 10 bi-layer tablets is
also preferably greater than 15.35 g, more preferably greater than
15.40 g, more preferably greater than 15.46 g, more preferably
greater than 15.53 g, more preferably greater than 15.59 g, more
preferably greater than 15.65 g.
[0071] Other embodiments and characteristics of the invention are
describe in further detail below.
[0072] Sustained Release Formulation
[0073] In one embodiment of the invention, a sustained release
formulation comprises guaifenesin and optionally at least one drug
both mixed with a polymer blend which comprises at least one
hydrophilic polymer and at least one water-insoluble polymer. In a
further embodiment, the sustained release formulation may comprise
a combination of guaifenesin and at least one additional drug,
wherein the additional drug may be selected from, but is not
limited to, an antitussive such as dextromethorphan hydrobromide,
codeine, hydrocodone, a decongestant such as phenylephrine
hydrochloride, phenylpropanolamine hydrochloride, pseudoephedrine
hydrochloride or ephedrine, an antihistamine such as
chlorpheniramine maleate, brompheniramine maleate, phenindamine
tartrate, pyrilamine maleate, doxylamine succinate,
phenyltoloxamine citrate, diphenhydramine hydrochloride,
promethazine, and clemastine fumerate, an analgesic such as
aspirin, ibuprofen, naprosin, and acetaminophen, or combinations
thereof. Preferably, the drug is dextromethorphan hydrobromide,
pseudoephedrine hydrochloride, or a combination thereof.
[0074] The sustained release matrix utilizes polymers as described
below to achieve the required delay release profile in vivo. To
obtain the release profile proper mixing and formulation is
required. For instance, too much hydrophilic polymer will result in
too quick of a release and not allow for 12 hour relief while too
much hydrophobic polymer will result in inadequate C.sub.max for
relief of symptoms. Therefore, the selection of polymers, the
amounts utilized in total and the amount utilized in comparison to
each other provide a matrix which is then formulated according to
the below methods to provide the appropriate release profile.
[0075] Hydrophilic polymers suitable for use in the sustained
release formulation include: one or more natural or partially or
totally synthetic hydrophilic gums such as acacia, gum tragacanth,
locust bean gum, guar gum, or karaya gum, modified cellulosic
substances such as methylcellulose, hydroxomethylcellulose,
hydroxypropyl methylcellulose, hydroxypropyl cellulose,
hydroxyethylcellulose, carboxymethylcellulose; proteinaceous
substances such as agar, pectin, carrageen, and alginates; and
other hydrophilic polymers such as carboxypolymethylene, gelatin,
casein, zein, bentonite, magnesium aluminum silicate,
polysaccharides, modified starch derivatives, and other hydrophilic
polymers known to those of skill in the art or a combination of
such polymers.
[0076] These hydrophilic polymers gel and dissolve slowly in
aqueous acidic media thereby allowing the guaifenesin and at least
one drug to diffuse from the gel in the stomach. When the gel
reaches the intestines, where the guaifenesin and the drug are
fairly absorbable, it dissolves in controlled quantities in the
higher pH medium to allow sustained release of guaifenesin and at
least one drug throughout the digestive tract. Preferred
hydrophilic polymers are the hydroxypropyl methylcelluloses such as
those manufactured by The Dow Chemical Company and known as
Methocel ethers. In one preferred embodiment of a sustained release
formulation the hydrophilic polymer is a Methocel ether known as
Methocel E10M.
[0077] Water-insoluble polymers which are suitable for use in the
sustained release formulation are polymers which generally do not
dissolve in solutions of a pH below 5, and dissolve more slowly in
basic solutions than the hydrophilic polymer. Because the polymer
is insoluble in low pH environments such as those found in gastric
fluid, it aids in retarding drug release in those regions.
Likewise, because the polymer dissolves more slowly in solutions of
higher pH than hydrophilic polymers, it aids in retarding drug
release throughout the intestines. This overall delayed release
results in a more uniform serum concentration of guaifenesin.
[0078] The water-insoluble polymers suitable for use in this
invention include for example: polyacrylic acids, acrylic resins,
acrylic latex dispersions, cellulose acetate phthalate, polyvinyl
acetate phthalate, hydroxypropyl methylcellulose phthalate, and
other polymers common to those of skill in the art. In a preferred
embodiment, a sustained release formulation comprises the acrylic
resin Carbopol 974P supplied by BF Goodrich.
[0079] A sustained release formulation of invention may further
comprise pharmaceutical additives including, but not limited to:
lubricants such as magnesium stearate, calcium stearate, zinc
stearate, powdered stearic acid, hydrogenated vegetable oils, talc,
polyethylene glycol, and mineral oil; colorants; binders such as
sucrose, lactose, gelatin, starch paste, acacia, tragacanth,
povidone polyethylene glycol, Pullulan and corn syrup; glidants
such as colloidal silicon dioxide and talc; surface active agents
such as sodium lauryl sulfate, dioctyl sodium sulfosuccinate,
triethanolamine, polyoxyethylene sorbitan, poloxalkol, and
quarternary ammonium salts; preservatives and stabilizers;
excipients such as lactose, mannitol, glucose, fructose, xylose,
galactose, sucrose, maltose, xylitol, sorbitol, chloride, sulfate
and phosphate salts of potassium, sodium, and magnesium; and/or any
other pharmaceutical additives known to those of skill in the art.
Colorants include, but are not limited to, Emerald Green Lake,
FD&C Red No. 40, FD&C Yellow No. 6, D&C Yellow No. 10,
or FD&C Blue No. 1 and other various certified color additives
(See 21 CFR, Part 74). In one preferred embodiment, a sustained
release formulation further comprises magnesium stearate and
Emerald Green Lake. In another preferred embodiment, a sustained
release formulation further comprises magnesium stearate and
FD&C Blue No. 1 Aluminum Lake Dye.
[0080] In another embodiment the sustained release formulation
comprises at least two drugs, one of which is guaifenesin, at least
one hydrophilic polymer, at least one water-insoluble polymer, and
at least one pharmaceutical additive which permits dissolution of
drugs in a therapeutically effective profile for an extended period
of time. It is preferred that the drug profile provide a
therapeutically effective profile for greater than 10 hours, more
preferably greater than 12 hours, and most preferably greater than
14 hours. In a preferred embodiment, a sustained release
formulation comprises from about 75% to about 95% guaifenesin by
weight, from about 1% to about 15% by weight of an additional drug,
from about 0.5% to about 10% hydroxypropyl methylcellulose, from
about 0.5% to about 2.5% acrylic resin, from about 0.4% to about
1.5% magnesium stearate, and from about 0.01% to about 1% colorant
by weight. In a more preferred embodiment, a sustained release
formulation comprises from about 75% to about 80% guaifenesin by
weight, from about 3% to about 10% by weight of an additional drug,
from about 3% to about 6% hydroxypropyl methylcellulose, from about
1% to about 1.5% acrylic resin, from about 0.7% to about 1%
magnesium stearate, and from about 0.03% to about 0.13% colorant by
weight.
[0081] The sustained release formulation controls the release of
guaifenesin and optionally at least one additional drug into the
digestive tract over an extended period of time resulting in an
improved profile when compared to immediate release combinations.
guaifenesin solubility is effected by the pH of the environment in
which it is present (i.e. stomach versus intestinal tract). In a
more acidic environment, such as the stomach, guaifenesin is less
soluble while in a higher pH environment, such as the intestines,
guaifenesin is readily soluble. The pH changes throughout the
digestive tract effect the dissolution rate of guaifenesin and are
partially determinate of the concentrations of guaifenesin attained
in the blood and tissues.
[0082] To maintain a blood concentration of guaifenesin which
provides good therapeutic effect, the release, or dissolution, of
guaifenesin from a formulation matrix is preferably retarded and/or
controlled through the intestines. The hydrophilic and
water-insoluble polymers of the sustained release formulation gel
when exposed to media of low pH. This gel matrix allows the
sustained release drugs, e.g. guaifenesin alone or in combination
with a second drug to diffuse at a controlled rate when exposed to
a higher pH environment.
[0083] When using drugs approved by the Food and Drug
Administration (FDA), the sustained release formulation may be
formulated to mimic the blood serum profile of guaifenesin and
optionally the additional drug(s) as described in the clinical
documents filed with the FDA or as required by the FDA. In other
words, the sustained release formulation releases at least one
additional drug at a similar rate to the commercially available
formulation, thereby providing a therapeutically effective amount
of the additional drug.
[0084] In a preferred embodiment, a sustained release formulation
comprises a hydrophilic polymer and a water-insoluble polymer in a
ratio of about one-to-one (1:1) to about nine-to-one (9:1), more
preferably the range is about three-to-two (3:2) to about
six-to-one (6:1), and most preferably the range of hydrophilic
polymer to water-insoluble polymer is about two-to-one (2:1) to
about four-to-one (4:1). In another embodiment, the sustained
release formulation comprises not more than about 10% hydrophilic
polymer, preferably, not more than 6%, and in a more preferred
embodiment, the sustained release formulation also comprises not
more than 2.5% of the water-insoluble polymer by weight. In another
preferred embodiment, the water-hydrophilic polymer is
hydroxypropyl methylcellulose and the water-insoluble polymer is
acrylic resin. The ratios result in a serum concentration profile
of guaifenesin that provides an optimal therapeutic concentration
for about twelve hours.
[0085] A sustained release formulation may be manufactured
according to any appropriate method known to those of skill in the
art of pharmaceutical manufacture. In one embodiment, guaifenesin
and a hydrophilic polymer may be mixed in a mixer with an aliquot
of water to form a wet granulation. The granulation may be dried to
obtain hydrophilic polymer encapsulated granules of guaifenesin.
The resulting granulation may be milled, screened, then blended
with various pharmaceutical additives, water insoluble polymer, and
additional hydrophilic polymer. The formulation may then tableted
and may further be film coated with a protective coating which
rapidly dissolves or disperses in gastric juices.
[0086] In a preferred embodiment the method of preparing a
sustained release formulation comprises loading approximately 126
kg of guaifenesin and about 2 kg of Methocel E10M into a high shear
mixer. The Methocel E10M and guaifenesin may be mixed for about
seven minutes at a mixing speed of about 150 RPM and a chopper
speed of about 2000 RPM. The mixing and chopping speeds may then be
increased to about 200 RPM and 3000 RPM respectively for about five
minutes while about 49 kg of water are added to the mixer contents.
The mixer may be run for two additional minutes to complete
granulation. In a further preferred embodiment, the shut off for
the mixer load is set to 21 kilowatts.
[0087] The wet granulation may be emptied into a fluid bed bowl and
placed into a fluid bed dryer set to a dryer air flow of 900 CFM
and an inlet temperature of about 50.degree. C. to about 55.degree.
C. until the outlet temperature increases at a rate of 1.degree. C.
per minute. The air flow may then be decreased to 600 CFM, and the
inlet temperature may be decreased to 43.degree. C. until the
granulation is dried to a moisture content of no more than 0.5%. In
another preferred embodiment, the outlet temperature is set to a
cut-off of 48.degree. C. In yet another preferred embodiment, an
agitator in the fluid bed bowl may be run intermittently during
drying. The dried granulation may be passed through a mill fitted
with a suitable screen size so that not more than about 30% of the
resulting granulation comes through a 100 mesh screen and not more
than about 10% of the resulting granulation is retained on a 10
mesh screen. In one preferred embodiment, the dried granulation may
be passed through a mill fitted with a 0.109'' size screen at a
mill speed of about 500 to about 1500 RPM and a screw feed rate of
about 35 to about 45 RPM. The resulting screened granulation is
about 95% guaifenesin and is called G Guaifenesin DC (Direct
Compressed) herein after. Screened granulation may be transferred
to a 10 cubic foot V blender, combined with about another 0.6 kg of
Methocel E10M, about 0.3 kg of a colorant such as Emerald Green
Lake or FD&C BLUE No. 1, about 0.7 kg of magnesium stearate,
and about 1.3 kg of Carbopol 974P. The combination may be blended
for about three minutes.
[0088] In another preferred embodiment the method of preparing a
sustained release formulation comprises loading about 101 kg to
about 150 kg of guaifenesin, about 4.5 kg to about 18 kg of the
additional drug, about 4.5 kg to about 5 kg of Methocel E10M, about
1.5 kg to about 2.25 kg of Carbopol.RTM. 974P, and about 40 g to
about 240 g of colorant into a high shear mixer. If at this time
water is to be added, then about 1 kg to about 1.5 kg of magnesium
stearate is added as well. The ingredients may be mixed for about
ten to about 12 minutes at a mixing speed of about 150 RPM and a
chopper speed of about 2000 RPM. The mixing and chopping speeds may
then be increased to about 200 RPM and 3000 RPM, respectively, for
about five minutes while optionally about 29 kg of water are added
to the mixer contents. If no water is added, then from about 1 kg
to about 1.5 kg of magnesium stearate can be added at this time.
The mixer may be run for ten additional minutes to complete
granulation. In a further preferred embodiment, the shut off for
the mixer load is set to 21 kilowatts.
[0089] The wet granulation may be emptied into a fluid bed bowl and
placed into a fluid bed dryer set to a dryer air flow of 900 CFM
and an inlet temperature of about 38.degree. C. to about 48.degree.
C. until the outlet temperature increases at a rate of 1.degree. C.
per minute. The air flow may then be decreased to 600 CFM, and the
inlet temperature may be decreased to 43.degree. C. until the
granulation is dried to a moisture content of no more than 0.5%. In
another preferred embodiment, the outlet temperature is set to a
cut-off of 48.degree. C. In yet another preferred embodiment, an
agitator in the fluid bed bowl may be run intermittently during
drying. The dried granulation may be passed through a mill fitted
with a suitable screen size so that not more than about 30% of the
resulting granulation comes through a 100 mesh screen and not more
than about 10% of the resulting granulation is retained on a 10
mesh screen. In one preferred embodiment, the dried granulation may
be passed through a mill fitted with a size screen of about 0.109''
to about 0.125'' at a mill speed of about 500 to about 1500 RPM and
a screw feed rate of about 35 to about 45 RPM.
[0090] The resulting formulations may further be compressed on a
tablet compressor machine using tooling to form tablets. The
tablets may be any appropriate weight, size, and shape depending on
the desired dosage strength of tablet. In one embodiment, these
tablets may further be loaded into a coating pan and film coated
with Opadry Y-S-3-714 (supplied by Colorcon, Inc.) and air dried in
the pan.
[0091] In another embodiment, the method of preparing a sustained
release formulation comprises blending the drugs, hydrophilic
polymer, water insoluble polymer, and any pharmaceutical additives.
The resulting blend may then be compressed into tablets and, if
desired, film coated with a protective coating which rapidly
dissolves or disperses in gastric juices. In a preferred embodiment
of such a method, about 126 kg of Guaifenesin DC (about 95%
purity), about 2.6 kg of Methocel E10M, about 1.3 kg of Carbopol
974P and about 0.333 kg of a colorant such as Emerald Green Lake or
FD&C BLUE No. 1 may be loaded into a 10 cubic foot V Blender.
The ingredients may be blended for about 20 minutes at which time
about 0.6 kg of magnesium stearate may be added to the blended
ingredients. This mixture may be blended for about another 10
minutes. The resulting formulation may further be compressed on a
tablet compressor machine using tooling to form tablets. The
tablets may be any appropriate weight, size, and shape depending on
the desired dosage strength of the tablet. These tablets may
further be loaded into a coating pan and film coated with Opadry
Y-S-3-714 (supplied by Colorcon, Inc.) and air dried in the
pan.
[0092] One embodiment of the invention uses the following general
methods of manufacturing. To make the Gualfenesin DC (95%)
intermediate granulation is conducted. The granulator is charged
with purified water USP. The guaifenesin USP is added into the
granulator. Next the hydroxypropyl methylcelluose USP (Methocel El
OM) is added. The guaifenesin intermediate is dried with the air
inlet temperature set about 5.degree. C., until the air outlet
temperature reached approximately 48.degree. C. A sample may then
be taken for in-process control testing (moisture analysis). After
the material reaches the target moisture level, discharge the blend
and proceed to milling. The dried granulation is then added to the
milling machine and the milling process initiated. Again a sample
may be taken for in-process control testing (moisture and sieve
analysis). The milled material is collected into tared fiber drums,
double-lined with plastic bags and containing a desiccant pouch
between the inner and outer plastic bags, then transferred to
blending. The batches are blended in a 60-cu. foot blender for at
least 10 minutes. Again, a sample may be taken for in-process
control testing (description, moisture, blend assay and sieve
analysis). The final sieve analysis for milled Guaifenesin DC
preferably will be as follows: not more than about 2 to 10%
retained on a 10-mesh screen (2.00 mm), not less than about 50 to
60% retained on the 20-mesh through 100-mesh screens (150 .mu.m),
not less than about 4 to 6% will pass through a 100-mesh screen,
and not more than about 15-20% will pass through a 140-mesh screen
(106 .mu.m). When at least 50%, and preferably at least 60% of the
Guaifenesin DC has a particle size in the range of from about 2 mm
to about 150 .mu.m, this facilitates both processability and
achievement of the desired in vivo release profiles for the single
entity and combination drugs described herein. The final
Guaifenesin DC (95%) granulation is collected into tared fiber
drums, double-lined with double-lined with plastic bags and
containing a desiccant pouch between the inner and outer plastic
bags.
[0093] In one embodiment the immediate release layer is produced
according to the following general procedures. The released
components, Guaifenesin DC (95%) and microcrystalline cellulose, NF
(Avicel.RTM. PH102), are weighed and blended in a PK V-blender for
about 20 minutes. Then sodium starch glycolate, NF (Explotab.RTM.),
is added to the blender and blend for about 10 minutes. Next
magnesium stereate, NF, is added to the blender and blended for
approximately an additional 10 minutes. Sample may then be taken
for in-process control testing (description, blend assay and sieve
analysis).
[0094] In one embodiment the sustained release layer is produced
according to the following general procedures. The released
components, Guaifenesin DC (95%) and pseudoephedrine HCl, USP,
previously screened through a No. 20 screen, are weighed and
blended for ten minutes with hydroxypropyl methylcellulose, USP
(Methocel E10M), Carbomer 934P and the appropriate colorant (FD
& C Red No. 40 aluminum lake dye for 1200 mg guaifenesin/120 mg
pseudoephedrine HCl tablets or FD & C Yellow No. 6 aluminum
lake dye for 600 mg guaifenesin/60 mg pseudoephedrine HCl tablets).
Next, an additional amounts of Guaifenesin DC (95%), previously
screened through a No. 10 screen, is added and blended for about
ten minutes. Then magnesium stereate, NF, previously screened
through a No. 20 screen, is added and blended for about ten
minutes. Again, samples may be taken for in-process control testing
(description, sieve analysis, and blend assay for both guaifenesin
and pseudoephedrine HCl). Tablet Compression involved loading each
blend OR and SR) into its respective hopper on the bi-layer tablet
compressor and then compressed according to the described
parameters.
[0095] Tablets comprising a sustained release formulation were
prepared and tested for both in vitro and in vivo release
characteristics as described in Examples 1, 2, and 3 below. In the
in vitro testing, the dissolution rates of these tablets were
compared against modified release tablets formulated without
acrylic resin (Example 1), and three commercially available
tablets, one being an immediate release formulation and the other
two being modified release formulations. Tablets comprising the
sustained release formulation demonstrated a slower, more
controlled release of guaifenesin over a twelve hour period than
any of the other tablets (see e.g., Example 1 and 2, and FIGS. 4
and 5).
[0096] In the in vivo testing, serum concentrations of subjects
taking tablets comprising the sustained release formulation were
compared with serum concentrations of subjects taking immediate
release guaifenesin tablets and modified release guaifenesin
tablets formulated without acrylic resin (see Example 3 and FIG.
6). Tablets comprising the sustained release formulation
demonstrated improved sustained release and therapeutic
concentration over an extended time period compared to the other
two formulations. Additionally, in the subjects taking tablets
comprising the sustained release formulation, it took longer for
guaifenesin to appear in the blood stream and the maximum
guaifenesin serum concentration (C.sub.max) was less than half that
of the subjects who took the immediate release tablets.
[0097] Modified Release Formulation
[0098] To improve the C.sub.max and guaifenesin appearance speed in
patients while maintaining therapeutic effect for about twelve
hours, a portion of a sustained release formulation as described
above may be combined with a portion of an immediate release
formulation in a modified release product. In a preferred
embodiment, at least one additional drug can be present within the
sustained release formulation, the immediate release formulation,
or both depending upon the desired effect. When using drugs
approved by the Food and Drug Administration (FDA), the sustained
release formulation, immediate release formulation, or both may be
formulated to mimic the blood serum profile of the additional drug
as described in the clinical documents filed with the FDA or as
required by the FDA. In other words, the sustained and/or immediate
release formulations of the modified release formulation may
release the at least one additional drug at a similar rate to the
commercially available formulation, thereby providing a
therapeutically effective amount of the additional drug.
[0099] The modified release formulation can be in the form of
bi-layered tablets, capsules having a combination of beads or
granules of immediate release formulation and sustained release
formulation, or a tablet wherein the sustained release formulation
comprises a core that is coated by a layer of the immediate release
formulation. For purpose of illustration only, the invention will
be described in detail in the context of the bi-layered tablet
embodiment.
[0100] The immediate release formulation may comprise guaifenesin
and various pharmaceutical additives such as lubricants, colorants,
binders, glidants, surface active agents, preservatives,
stabilizers, as described above and/or any other pharmaceutical
additives known to those of skill in the art. In one embodiment,
the immediate release layer comprises at least one drug. In another
embodiment, the immediate release layer comprises at least two
drugs. In a more preferred embodiment, an immediate release
formulation comprises guaifenesin, microcrystalline cellulose,
sodium starch glycolate, and magnesium stearate. In another more
preferred embodiment, an immediate release formulation comprises
guaifenesin, at least one additional drug, microcrystalline
cellulose, hydroxypropyl methylcellulose, sodium starch glycolate,
and magnesium stearate. In yet another preferred embodiment, an
immediate release formulation may comprise about 47% to about 58%
guaifenesin, about 32% to about 42% microcrystalline cellulose,
about 3% to about 8% sodium starch glycolate, and about 0.3% to
about 0.5% magnesium stearate by weight. In yet another preferred
embodiment, an immediate release formulation comprises about 47% to
about 58% guaifenesin, about 3% to about 5% of at least one
additional drug, about 32% to about 42% microcrystalline cellulose,
about 2% to about 5% hydroxypropyl methylcellulose, about 3% to
about 8% sodium starch glycolate, and about 0.3% to about 0.5%
magnesium stearate by weight.
[0101] The bi-layer tablet may be manufactured according to any
method known to those of skill in the art. The resulting tablet
comprises the two portions compressed against one another so that
the face of each portion is exposed as either the top or bottom of
the tablet, or the resulting tablet may comprise the sustained
release portion in the center coated by the immediate release
portion so that only the immediate release portion is exposed. In a
preferred embodiment, a bi-layer tablet comprises the two portions
compressed against one another so that the face of each portion is
exposed.
[0102] In a preferred method of manufacturing the bi-layer tablets,
a sustained release formulation is prepared according to either a
wet granulation or dry granulation method as described above. The
immediate release formulation may be prepared by simply blending
the guaifenesin with any pharmaceutical additives. If at least one
additional drug is present, then water may be added to the
formulation, as described above. In a further preferred embodiment,
appropriate quantities of Guaifenesin DC, microcrystalline
cellulose, and sodium starch glycolate are blended in a 10 cubic
foot blender for about twenty minutes. An appropriate quantity of
magnesium stearate is then added to the ingredients and blended for
about ten more minutes to make an immediate release formulation.
Portions of the sustained release formulation and immediate release
formulation are then compressed by a tablet compressor machine
capable of forming bi-layer tablets. In one embodiment, these
tablets may further be coated with a protective film which rapidly
disintegrated or dissolves in gastric juices.
[0103] The tablets may be made with any ratio of guaifenesin to at
least one additional drug which results in a blood profile
demonstrating appropriate therapeutic effect over extended time
periods. As discussed above, the additional drug may be present in
an amount sufficient to mimic the blood serum profile of the
commercially available formulation of the drug and not to exceed
the maximum dose approved by the FDA for the treatment, prevention,
or amelioration of a particular illness or disease. In one
embodiment, the ratio of total guaifenesin to at least one
additional drug is about 1:1 to about 20:1 by weight, preferably,
the ratio is about 2:1 to about 15:1 by weight, and more
preferably, the ratio of guaifenesin to at least one additional
drug is about 8:1 to about 12:1 by weight. When present in the
immediate release layer, the amount of the at least one additional
drug should be sufficient to match the drug release profile of the
additional drug within the sustained release profile.
[0104] In a preferred embodiment, the tablets are made with any
ratio of guaifenesin to pseudoephedrine which results in a blood
profile demonstrating appropriate therapeutic effect over extended
time periods. As discussed above, the pseudoephedrine is present in
an amount sufficient to mimic the blood serum profile of the
commercially available formulation of the drug and not to exceed
the maximum dose approved by the FDA for the treatment, prevention,
or amelioration of a particular illness or disease. In one
embodiment, the ratio of total guaifenesin to pseudoephedrine is
about 1:1 to about 20:1 by weight, preferably, the ratio is about
2:1 to about 15:1 by weight, and more preferably, the ratio of
guaifenesin to pseudoephedrine is about 8:1 to about 12:1 by
weight. In another embodiment the pseudoephedrine is only present
in the immediate release layer.
[0105] The tablets may be made with any ratio of sustained release
to immediate release formulation which results in a blood profile
demonstrating appropriate therapeutic effect over extended time
periods. In one embodiment, the bi-layer tablets comprise
guaifenesin distributed within the sustained release formulation
and the immediate release formulation wherein the ratio of
guaifenesin in the SR to guaifenesin in the IR is about 1:1 to
about 15:1 by weight, preferably the ratio is about 3:2 to about
11:1, and more preferably, the ratio of guaifenesin distributed
within the sustained release formulation and the immediate release
formulation is about 5:1 to about 9:1 by weight, respectively. For
example, in a 1200 mg bi-layer modified release guaifenesin tablet,
there may be about 200 mg of guaifenesin in the immediate release
layer and about 1000 mg of guaifenesin in the sustained release
layer.
[0106] The tablets may be made with at least one additional drug
only within the sustained release formulation or with the
additional drug only in the immediate release formulation.
Optionally, the tablets may be made with at least one additional
drug distributed within the sustained release formulation and the
immediate release formulation. In one embodiment, the bi-layer
tablets comprise an additional drug distributed within the
sustained release formulation and immediate release formulation
wherein the ratio of additional drug in the SR to additional drug
in the IR is about 1:1 to about 19:1 by weight, preferably the
ratio is about 3:2 to about 9:1, and more preferably the ratio is
about 3:1 to about 4:1 by weight, respectively.
[0107] In one preferred embodiment of manufacturing a 1200 mg
bi-layer sustained release guaifenesin tablet, about 105 kg of
Guaifenesin DC, about 2.5 kg of Methocel E10M, about 1.25 kg of
Carbopol 974P, and about 0.333 kg of Emerald Green Lake or FD&C
Blue No. 1 in a 10 cubic foot P.K. blender for about twenty
minutes. About 0.6 kg of magnesium stearate may then be added and
blending continued for about another ten minutes to prepare the
sustained release formulation. Approximately 21 kg of Guaifenesin
DC, approximately 11.75 kg of microcrystalline cellulose, and
approximately 3 kg of sodium starch glycolate may be blended in a 3
cubic foot P.K. blender for about twenty minutes. Approximately 0.1
kg of magnesium stearate may then be added and blending continued
for about another ten minutes to prepare the immediate release
formulation. The two formulations may then be compressed to make
bi-layer tablets wherein about 75% of each tablet may be sustained
release formulation and about 25% of each tablet may be immediate
release formulation. The tablets may be any dosage strength, size,
or shape. In a preferred embodiment, 1200 mg tablets are round and
about 5/8 inch in diameter, about 0.28 inch-0.31 inch in thickness,
weigh about 1.46 grams and have a hardness range of about 15-40
SCU. In another preferred embodiment, 600 mg tablets are round and
about 1/2 inch in diameter, about 0.218 inch-0.230 inch in
thickness, weigh about 0.729 grams and have a hardness range of
about 12-30 SCU.
[0108] In another preferred embodiment of manufacturing a 1200 mg
bi-layer sustained release guaifenesin tablet, about 101 kg of
Guaifenesin DC, about 4.5 kg of at least one additional drug such
as dextromethorphan, about 5 kg of Methocel E10M, about 1.5 kg of
Carbopol 974P, and about 0.04 kg of FD&C Blue No. 1 are blended
in a 10 cubic foot Day mixer for about twelve minutes. Thereafter,
about 29 kg of water is added and the mixture is blended for an
additional 10 minutes, followed by drying. About 1 kg of magnesium
stearate may then be added and blending continued for about another
ten minutes to prepare the sustained release formulation. About
45.6 kg of GUAIFENESIN, about 3.6 kg of at least one additional
drug such as dextromethorphan, about 40.32 kg of microcrystalline
cellulose, and approximately 3 kg of sodium starch glycolate are
blended in a 3 cubic foot Day mixer for about 12 minutes.
Thereafter, about 36 kg of water is added and the mixture is
blended for an additional 10 minutes, followed by drying. About
0.48 kg of magnesium stearate may then be added and blending
continued for about another ten minutes to prepare the immediate
release formulation. The two formulations may then be compressed to
make bi-layer tablets wherein about 75% of each tablet may be
sustained release formulation and about 25% of each tablet may be
immediate release formulation. The tablets may be any dosage
strength, size, or shape. In a preferred embodiment, 1200 mg
tablets are round and about 5/8 inch in diameter, about 0.31
inch-0.34 inch in thickness, weigh about 15.3 grams and have a
hardness range of about 15-35 SCU. In another preferred embodiment,
600 mg tablets are round and about 1/2 inch in diameter, about 0.22
inch-0.26 inch in thickness, weigh about 7.65 grams and have a
hardness range of about 15-65 SCU.
[0109] The immediate release portion of the bi-layer tablet is
formulated to dissolve in aqueous media of low pH, such as that
found in the stomach, to quickly release the guaifenesin contained
within the portion. This results in rapid bioavailability of a high
concentration of guaifenesin. As demonstrated in Example 6 and
FIGS. 9 and 10 below, the immediate release portion of the bi-layer
tablet results in a maximum serum concentration (C.sub.max) and
time of maximum serum concentration (T.sub.max) equivalent to the
C.sub.max obtained when the first of three doses of a standard
immediate release formulation having one third the amount of
guaifenesin is dosed every four hours over a 12 hour period.
[0110] The sustained release portion gels when exposed to media of
low pH allowing the sustained release portion of the tablet to be
passed into the intestinal tract. In the intestines, the gelled
sustained release portion is exposed to a higher pH environment,
causing the gel to slowly dissolve, thereby allowing guaifenesin to
diffuse and dissolve out of the gelled matrix. This results in
controlled bioavailability over an extended time period (i.e. eight
to twelve or more hours) causing the tablet to provide extended
therapeutic effect. As shown in Example 6 and FIGS. 9 and 10, the
half-life of the modified release bi-layer tablet is increased to
more than 3 hours and the tablet has an AUC.sub.inf (the area under
a plasma concentration versus time curve from time 0 to infinity)
of greater than 8000 hr-ng/mL.
[0111] As demonstrated in Example 7 and FIG. 11, the bi-layer
tablets of the invention had a further surprising result in that a
600 mg tablet had a T.sub.max equivalent to that of a 1200 mg and a
C.sub.max and AUC.sub.inf approximately half of a 1200 mg tablet.
Thus, without adjusting or changing the composition of the
sustained release formulation or bi-layer tablet, a lower dosage
strength guaifenesin tablet of the invention exhibits a plasma
concentration profile that is approximately directly proportional
to that of a higher dosage strength guaifenesin tablet. As further
demonstrated in Example 7 and FIG. 11, the bi-layer tablets
resulted in that the C.sub.max and AUC.sub.inf of a 1200 mg tablet
administered to volunteers who had been fasting and the C.sub.max
and AUC.sub.inf of a 1200 mg tablet administered to volunteers who
had consumed a high fat meal were approximately equivalent. Thus, a
bi-layer tablet of the invention demonstrates a reduced food
effect, being approximately equally effective when administered to
a patient on an empty or full stomach. Similar results were
obtained for combination formulations for instance as described in
Examples 8-17.
[0112] Several combination formulations were also compared to
commercial drugs for bioavailability. For instance, Example 8 shows
three batches of the 1200 mg guaifenesin/60 mg dextromethorphan HBr
which were dissolved to determine the amount of dextromethorphan
HBr released over time. Generally, the formulations had 1200 mg of
guaifenesin and 60 mg dextromethorphan HBr and were studied over a
12 hour period. The released amount of dextromethorphan HBr was
determined as a weight percent of dissolved dextromethorphan in
contrast to the total weight of dextromethorphan prior to
dissolution. After 1 hour about 46% to 47% of the dextromethorphan
had dissolved. After 2 hours the about 59% to 60% had dissolved,
after 6 hours 73% to 76% had dissolved, and after 12 hours about
86% to 89% by weight of the dextromethorphan had dissolved. Thus,
the formulations of the invention reproducibly release
dextromethorphan over time. (see, FIG. 12). While, example 9, for
instance demonstrates the in vivo bioavailability of a sustained
release guaifenesin with dextromethorphan.
[0113] Various combination guaifenesin/pseudoephedrine compositions
were also examined to determine their dissolution rates and
bioavailability. Examples 10 and 11, provide a formulations of
guaifenesin and pseudoephedrine in the sustained release portion of
a bi-layered tablet. Results demonstrated that combining the drugs
into a single tablet according to methods of the invention did not
effect their dissolution profile or their in vivo release
profile.
[0114] The two prototype lots of example 12 showed similar in vitro
release to market Mucinex.TM. and Sudafed.RTM.. In particular,
Formulation B (lot PB01-K61) produced optimal bioavailability for
both guaifenesin and pseudoephedrine and was therefore used in
subsequent bioavailability studies.
[0115] Example 13 compared combination products for
guaifenesin/pseudoephedrine HCL) of 1200/120 mg strength,
Formulation B (lot PB01-M65A2) and of 600/60 mg strength,
Formulation C (lot PB01-A12A) to commercial Mucinex.TM. and
Sudafed.RTM. 12 Hour. The 1200/120 mg strength showed
bioequivalence for ratios of both C.sub.max and AUC.sub.inf with a
90% confidence interval, which is contained in the 80-125% range.
Further, the 600/60 mg strength demonstrated proportional dosage
pharmacokinetics.
[0116] Example 14 compared reference Mucinex.TM. and Sudafed.RTM.
12 Hour to a 1200/120 mg strength test formulation (lot PB01-M65A3)
for steady-state bioavailability in a 11 day twice-daily dose
regime. The test formulation was bioequivalent (within the 80-125%
range with a 90% confidence interval) when compared to the
reference formulation. Therefore, for both guaifenesin and
pseudoephedrine, the steady state for C.sub.max and AUC.sub.ss were
bioequivalent.
[0117] Examples 15 and 17 compared the effect of a high fat meal
for both reference formulations and combination formulations of the
invention. The test formulation (lot PB01-M65) was not
bioequivalent with regard to C.sub.max for guaifenesin but was for
the pseudoephedrine portion when compared to the reference.
However, the AUC.sub.inf was bioequivalent for both guaifenesin and
pseudoephedrine within the 80-125% range.
[0118] Example 16 compared single-dose relative bioavailability and
interaction potential of guaifenesin and pseudoephedrine
administered as Mucinex.TM. and Sudafed.RTM. 12 Hour alone or in
combination. The results demonstrate that the pharmacokinetics of
guaifenesin and pseudoephedrine are unaffected with regard to both
AUC.sub.inf and C.sub.max in the presence or absence of one another
(ratios within 80-125%). This further confirms the results of the
other examples which demonstrate bioequivalence for the combination
formulations of the invention.
[0119] These studies demonstrate the compositions of the invention
provide systemic levels of drug over a 12-hour period.
Additionally, the studies demonstrate the bioequivalence of the
combination formulations.
[0120] Comparison to FDA Approved Drugs
[0121] When using drugs approved by the Food and Drug
Administration (FDA), the sustained release formulation alone or in
combination with an immediate release component may be formulated
to mimic the blood serum profile of guaifenesin and optionally the
additional drug(s) as described in the clinical documents filed
with the FDA or as required by the FDA. This information may be
found at http://www.fda.gov/cder/foi/nda/2002/21-282_Mucinex.htm
which is hereby incorporated by reference in its entirety. For
instance, a single dose 400 mg immediate release tablet has a
C.sub.max of 2,463.+-.1033, a T.sub.max of 0.5, an AUC.sub.0-12
8,382.+-.3,282, an AUC.sub.inf 8,529.+-.3,362, and a T.sub.1/2 of
0.78.+-.0.09. Alternatively, multiple doses of a 400 mg immediate
release tablet has a C.sub.max of 2,278.+-.791, a T.sub.max of 0.5,
an AUC.sub.0-12 7,751.+-.2,697, C.sub.min0 112.+-.52, and a
C.sub.min12 137.+-.98. Preferably, the formulations result in a
maximum serum concentration (C.sub.max) and/or time of maximum
serum concentration (T.sub.max) equivalent to the C.sub.max
obtained when the first of three doses of a standard immediate
release formulation having one third the amount of guaifenesin is
dosed every four hours over a 12 hour period. In other words, the
sustained release formulation releases both the guaifenesin and at
least one additional drug at a similar rate to the commercially
available formulation, thereby providing a therapeutically
effective amount of both drugs. Alternatively, the parameters may
be calculated through any of the following or combinations thereof:
C.sub.max, C.sub.min, T.sub.max, AUC.sub.inf, AUC.sub.0-t,
AUC.sub.ss and T.sub.1/2. Unless otherwise specified, all reference
to AUC.sub.0-t in the specification and claims shall refer to data
which corresponds to a time (t) of 24 hours. The parameters may
also be calculated from in vivo studies such as those presented
herein where equivalence is determined from the mean and a 80-125%
range with a 90% confidence level and/or one standard deviation
from the mean. FIGS. 31 and 32 demonstrate specification ranges for
various batch compositions of the invention.
[0122] Additionally the C.sub.max for either guaifenesin, the
additional drug(s) or both is preferably between 80% and 125% of
the FDA approved mean, more preferably between 90% and 115%, and
most preferably between 95% and 115%. These ranges do not have to
adjust commensurately, that is to say the mean may for instance
preferably be between 90% and 125% of the FDA mean depending on the
formulation. Alternatively, the low end of the C.sub.max for
guaifenesin is preferably greater than 640 ng/mL, more preferably
800 ng/mL, more preferably 1000 ng/mL, and most preferably 1250
ng/mL depending on the formulation. The high end of the C.sub.max
for guaifenesin is preferably less than 3750 ng/mL, more preferably
3000 ng/mL, more preferably 2750 ng/mL, and most preferably 2500
ng/mL depending on the formulation. For a 1200 mg tablet the range
is preferably between 1000 ng/mL and 3750 ng/mL, 1200 ng/mL and
3500 ng/mL, 1350 ng/mL and 3000 ng/mL, and 1450 ng/mL and 2750
ng/mL. For a 600 mg tablet the range is preferably between 320
ng/mL and 1875 ng/mL, 400 ng/mL and 1500 ng/mL, 500 ng/mL and 1375
ng/mL, and 625 ng/mL and 1250 ng/mL.
[0123] Alternatively, the low end of the C.sub.max for
pseudoephedrine is preferably greater than 150 ng/mL, more
preferably 175 ng/mL, more preferably 200 ng/mL, and most
preferably 250 ng/mL depending on the formulation. The high end of
the C.sub.max for pseudoephedrine is preferably less than 500
ng/mL, more preferably 450 ng/mL, more preferably 400 ng/mL, and
most preferably 375 ng/mL depending on the formulation. For a 120
mg tablet the range is preferably between 150 ng/mL and 500 ng/mL,
175 ng/mL and 500 ng/mL, 200 ng/mL and 450 ng/mL, 250 ng/mL and 400
ng/mL, and 300 ng/mL and 375 ng/mL. For a 60 mg tablet the range is
preferably between 75 ng/mL and 250 ng/mL, 88 ng/mL and 250 ng/mL,
100 ng/mL and 225 ng/mL, 125 ng/mL and 200 ng/mL, and 150 ng/mL and
188 ng/mL.
[0124] The C.sub.min is another aspect which is often not met by
various extended release drugs found on the market. Formulations of
the invention provide a C.sub.min which maintains it therapeutic
effectiveness for a period of at least 10 hours, more preferably 12
hours and most preferably 14 or more hours. Additionally the
C.sub.min for either guaifenesin, the additional drug(s) or both is
preferably between 80% and 125% of the FDA approved mean, more
preferably between 90% and 115%, and most preferably between 95%
and 115%. These ranges do not have to adjust commensurately, that
is to say the mean may for instance preferably be between 90% and
125% of the FDA mean depending on the formulation. Alternatively,
the low end of the C.sub.min for guaifenesin is preferably greater
than 40 ng/mL, more preferably 50 ng/mL, more preferably 60 ng/mL,
and most preferably 70 ng/mL depending on the formulation. The high
end of the C.sub.min for guaifenesin is preferably less than 200
ng/mL, more preferably 175 ng/mL, more preferably 150 ng/mL, and
most preferably 125 ng/mL depending on the formulation. The
C.sub.min range for either a 1200 or a 600 mg tablet may be
selected from 50 ng/mL and 150 ng/mL, 50 ng/mL and 125 ng/mL, 60
ng/mL, 125 ng/mL, 70 ng/mL and 125 ng/mL, 80 ng/mL and 125 ng/mL,
between 35 ng/mL and 75 ng/mL, 40 ng/mL and 70 ng/mL, 45 ng/mL and
65 ng/mL, and 50 ng/mL and 60 ng/mL.
[0125] Alternatively, the low end of the C.sub.min for
pseudoephedrine is preferably greater than 75 ng/mL, more
preferably 100 ng/mL, more preferably 125 ng/mL, and most
preferably 150 ng/mL depending on the formulation. The high end of
the C.sub.min for pseudoephedrine is preferably less than 300
ng/mL, more preferably 250 ng/mL, more preferably 225 ng/mL, and
most preferably 200 ng/mL depending on the formulation. The
C.sub.min range for either a 120 mg or 60 mg tablet may be selected
from 75 ng/mL and 300 ng/mL, 100 ng/mL and 250 ng/mL, 125 ng/mL and
225 ng/mL, 150 ng/mL and 200 ng/mL.
[0126] Formulations of the invention provide a T.sub.max for either
guaifenesin, the additional drug(s) or both which is preferably
between 80% and 125% of the FDA approved mean, more preferably
between 90% and 115%, and most preferably between 95% and 115%.
These ranges do not have to adjust commensurately, that is to say
the mean may for instance preferably be between 90% and 125% of the
FDA mean depending on the formulation. Alternatively, the low end
of the T.sub.max for guaifenesin is preferably greater than 0.6
hours, more preferably 0.8 hours, more preferably 0.9 hours, more
preferably 1.0 hours, and most preferably 1.1 hours depending on
the formulation. The high end of the T.sub.max for guaifenesin is
preferably less than 3.0 hours, more preferably 2.5 hours, more
preferably 2.25 hours, and most preferably 2 hours depending on the
formulation. The T.sub.max range may also be selected from between
0.6 hours and 3.0 hours, 0.8 hours and 2.5 hours, 0.9 hours and
2.25 hours, 1.0 hours and 2 hours, and 1.1 hours and 2 hours.
[0127] Alternatively, the low end of the T.sub.max for
pseudoephedrine is preferably greater than 3.75 hours, more
preferably 4.0 hours, more preferably 4.25 hours, more preferably
4.5 hours, and most preferably 4.75 hours depending on the
formulation. The high end of the T.sub.max for pseudoephedrine is
preferably less than 9.0 hours, more preferably 8.5 hours, more
preferably 8.0 hours, and most preferably 7.5 hours depending on
the formulation. The T.sub.max range may also be selected from
between 3.75 hours and 9.0 hours, 4.0 hours and 8.5 hours, 4.25
hours and 8.0 hours, 4.5 hours and 7.5 hours, and 4.75 hours and
7.5 hours.
[0128] Formulations of the invention provide a AUC.sub.inf for
either guaifenesin, the additional drug(s) or both which is
preferably between 80% and 125% of the FDA approved mean, more
preferably between 90% and 115%, and most preferably between 95%
and 115%. These ranges do not have to adjust commensurately, that
is to say the mean may for instance preferably be between 90% and
125% of the FDA mean depending on the formulation. Alternatively,
the low end of the AUC.sub.inf for guaifenesin is preferably
greater than 4,000 hr-ng/mL, more preferably 5,000 hr-ng/mL, more
preferably 5,500 hr-ng/mL, and most preferably 6,000 hr-ng/mL
depending on the formulation. The high end of the AUC.sub.inf for
guaifenesin is preferably less than 12,500 hr-ng/mL, more
preferably 10,000 hr-ng/mL, more preferably 9,500 hr-ng/mL, and
most preferably 9,000 hr-ng/mL depending on the formulation. For a
1200 mg tablet the AUC.sub.inf range may be selected from between
4,000 hr-ng/mL and 12,500 hr-ng/mL, 5,000 hr-ng/mL and 10,000
hr-ng/mL, 5,500 hr-ng/mL and 9,500 hr-ng/mL, and 6,000 hr-ng/mL and
9,000 hr-ng/mL. For a 600 mg tablet the AUC.sub.inf range may be
selected from between 2,000 hr-ng/mL and 6,250 hr-ng/mL, 2,500
hr-ng/mL and 5,000 hr-ng/mL, 2,250 hr-ng/mL and 4,750 hr-ng/mL, and
3,000 hr-ng/mL and 4,500 hr-ng/mL.
[0129] Alternatively, the low end of the AUC.sub.inf for
pseudoephedrine is preferably greater than 2,500 hr-ng/mL, more
preferably 2,800 hr-ng/mL, more preferably 3,500 hr-ng/mL, and most
preferably 3,750 hr-ng/mL depending on the formulation. The high
end of the AUC.sub.inf for pseudoephedrine is preferably less than
6,000 hr-ng/mL, more preferably 5,800 hr-ng/mL, more preferably
5,500 hr-ng/mL, and most preferably 5,000 hr-ng/mL depending on the
formulation. For a 120 mg tablet the AUC.sub.inf may be selected
from between 2,500 hr-ng/mL and 6,000 hr-ng/mL, 2,800 hr-ng/mL and
5,800 hr-ng/mL, 3,500 hr-ng/mL and 5,500 hr-ng/mL, and 3,750
hr-ng/mL and 5,000 hr-ng/mL. For a 60 mg tablet the AUC.sub.inf may
be selected from between 1,250 hr-ng/mL and 3,000 hr-ng/mL, 1,400
hr-ng/mL and 2,900 hr-ng/mL, 1,750 hr-ng/mL and 2,750 hr-ng/mL, and
1,875 hr-ng/mL and 2,500 hr-ng/mL.
[0130] Formulations of the invention provide a AUC.sub.0-t for
either guaifenesin, the additional drug(s) or both which is
preferably between 80% and 125% of the FDA approved mean, more
preferably between 90% and 115%, and most preferably between 95%
and 115%. These ranges do not have to adjust commensurately, that
is to say the mean may for instance preferably be between 90% and
125% of the FDA mean depending on the formulation. Alternatively,
the low end of the AUC.sub.0-t for guaifenesin is preferably
greater than 3,200 hr-ng/mL, more preferably 3,700 hr-ng/mL, more
preferably 4,000 hr-ng/mL, and most preferably 4,500 hr-ng/mL
depending on the formulation. The high end of the AUC.sub.0-t for
guaifenesin is preferably less than 11,250 hr-ng/mL, more
preferably 10,500 hr-ng/mL, more preferably 9,500 hr-ng/mL, more
preferably 9,000 hr-ng/mL, and most preferably 8,500 hr-ng/mL
depending on the formulation. For a 1200 mg tablet the AUC.sub.0-t
may be selected from between 3,200 hr-ng/mL and 11,250 hr-ng/mL,
3,700 hr-ng/mL and 10,500 hr-ng/mL, 4,000 hr-ng/mL and 9,500
hr-ng/mL, 4,250 hr-ng/mL and 9,000 hr-ng/mL, and 4,500 hr-ng/mL and
8,500 hr-ng/mL. For a 600 mg tablet the AUC.sub.0-t may be selected
from between 1,600 hr-ng/mL and 5,625 hr-ng/mL, 1,850 hr-ng/mL and
5,250 hr-ng/mL, 2,000 hr-ng/mL and 4,750 hr-ng/mL, 2,125 hr-ng/mL
and 4,500 hr-ng/mL, and 2,250 hr-ng/mL and 4,250 hr-ng/mL.
[0131] Alternatively, the low end of the AUC.sub.0-t for
pseudoephedrine is preferably greater than 2,000 hr-ng/mL, more
preferably 2,200 hr-ng/mL, more preferably 2,500 hr-ng/mL, and most
preferably 2,800 hr-ng/mL depending on the formulation. The high
end of the AUC.sub.0-t for pseudoephedrine is preferably less than
6,000 hr-ng/mL, more preferably 5,750 hr-ng/mL, more preferably
5,500 hr-ng/mL, more preferably 5,250 hr-ng/mL, and most preferably
5,000 hr-ng/mL depending on the formulation. For a 120 mg tablet
the AUC.sub.0-t may be selected from between 2,000 hr-ng/mL and
6,000 hr-ng/mL, 2,200 hr-ng/mL and 5,750 hr-ng/mL, 2,500 hr-ng/mL
and 5,500 hr-ng/mL, 2,700 hr-ng/mL and 5,250 hr-ng/mL, and 2,800
hr-ng/mL and 5,000 hr-ng/mL. For a 60 mg tablet the AUC.sub.0-t may
be selected from between 1,000 hr-ng/mL and 3,000 hr-ng/mL, 1,100
hr-ng/mL and 2,875 hr-ng/mL, 1,250 hr-ng/mL and 2,750 hr-ng/mL,
1,350 hr-ng/mL and 2,625 hr-ng/mL, and 1,400 hr-ng/mL and 2,500
hr-ng/mL.
[0132] Formulations of the invention provide a AUC.sub.ss for
either guaifenesin, the additional drug(s) or both which is
preferably between 80% and 125% of the FDA approved mean, more
preferably between 90% and 115%, and most preferably between 95%
and 115%. These ranges do not have to adjust commensurately, that
is to say the mean may for instance preferably be between 90% and
125% of the FDA mean depending on the formulation. Alternatively,
the low end of the AUC.sub.ss for guaifenesin is preferably greater
than 5000 hr-ng/mL, more preferably 5600 hr-ng/mL, more preferably
6000 hr-ng/mL, and most preferably 6500 hr-ng/mL depending on the
formulation. The high end of the AUC.sub.ss for guaifenesin is
preferably less than 9000 hr-ng/mL, more preferably 8750 hr-ng/mL,
more preferably 8250 hr-ng/mL, and most preferably 8000 hr-ng/mL
depending on the formulation. The AUC.sub.ss for a 1200 mg tablet
may be selected from between 5000 hr-ng/mL and 9000 hr-ng/mL, 5600
hr-ng/mL and 8750 hr-ng/mL, 6000 hr-ng/mL and 8000 hr-ng/mL, and
6500 hr-ng/mL and 8250 hr-ng/mL. The AUC.sub.ss for a 600 mg tablet
may be selected from between 2,500 hr-ng/mL and 4,500 hr-ng/mL,
2,800 hr-ng/mL and 4,375 hr-ng/mL, 3,000 hr-ng/mL and 4,000
hr-ng/mL, and 3,250 hr-ng/mL and 4,125 hr-ng/mL.
[0133] Alternatively, the low end of the AUC.sub.ss for
pseudoephedrine is preferably greater than 2,100 hr-ng/mL, more
preferably 2,400 hr-ng/mL, more preferably 2,650 hr-ng/mL, and most
preferably 2,800 hr-ng/mL depending on the formulation. The high
end of the AUC.sub.ss for pseudoephedrine is preferably less than
5,500 hr-ng/mL, more preferably 5,000 hr-ng/mL, more preferably
4,500 hr-ng/mL, and most preferably 4,000 hr-ng/mL depending on the
formulation. The AUC.sub.ss for a 120 mg tablet may be selected
from between 2,100 hr-ng/mL and 5,500 hr-ng/mL, 2,400 hr-ng/mL and
5,000 hr-ng/mL, 2,650 hr-ng/mL and 4,500 hr-ng/mL, and 2,800
hr-ng/mL 4,000 hr-ng/mL. The AUC.sub.ss for a 60 mg tablet may be
selected from between 1,050 hr-ng/mL and 2,250 hr-ng/mL, 1,200
hr-ng/mL and 2,500 hr-ng/mL, 1,325 hr-ng/mL and 2,250 hr-ng/mL, and
1,400 hr-ng/mL 2,000 hr-ng/mL.
[0134] Formulations of the invention provide a T.sub.1/2 for either
guaifenesin, the additional drug(s) or both which is preferably
between 80% and 125% of the FDA approved mean, more preferably
between 90% and 115%, and most preferably between 95% and 115%.
These ranges do not have to adjust commensurately, that is to say
the mean may for instance preferably be between 90% and 125% of the
FDA mean depending on the formulation. Alternatively, the low end
of the T.sub.1/2 for guaifenesin is preferably greater than 0.7
hours, more preferably 0.9 hours, more preferably 1.1 hours, more
preferably 1.3 hours, and most preferably 1.4 hours depending on
the formulation. The high end of the T.sub.1/2 for guaifenesin is
preferably less than 7.25 hours, more preferably 6.0 hours, more
preferably 5.0 hours, and most preferably 3.5 hours depending on
the formulation. The T.sub.1/2 for a 1200 mg tablet may be selected
from between 0.7 hours and 7.25 hours, 0.9 hours and 6.0 hours, 1.1
hours and 5.0 hours, 1.3 hours and 3.5 hours, and 1.4 hours and 3.5
hours. The T.sub.1/2 for a 600 mg tablet may be selected from
between 0.35 hours and 3.63 hours, 0.45 hours and 3.0 hours, 0.55
hours and 2.5 hours, 0.65 hours and 1.75 hours, and 0.70 hours and
1.75 hours.
[0135] Alternatively, the low end of the T.sub.1/2 for
pseudoephedrine is preferably greater than 3.2 hours, more
preferably 3.6 hours, more preferably 4.0 hours, more preferably
4.2 hours, and most preferably 4.5 hours depending on the
formulation. The high end of the T.sub.1/2 for pseudoephedrine is
preferably less than 8.0 hours, more preferably 7.5 hours, more
preferably 7.0 hours, and most preferably 6.25 hours depending on
the formulation. The T.sub.1/2 for a 120 mg tablet may be selected
from between 3.2 hours and 8.0 hours, 3.6 hours and 7.5 hours, 4.0
hours and 7.0 hours, 4.2 hours and 6.25 hours, and 4.5 hours and
6.25 hours. The T.sub.1/2 for a 60 mg tablet may be selected from
between 1.60 hours and 4.0 hours, 1.80 hours and 3.75 hours, 2.0
hours and 3.5 hours, 2.1 hours and 3.13 hours, and 2.25 hours and
3.13 hours.
[0136] Examples of other sustained release/immediate release
formulations with and without additional drugs are discussed
further in the examples which follow.
EXAMPLES
[0137] The invention is further defined by reference to the
following examples describing in detail the compositions and
methods of the invention. It will be apparent to those skilled in
the art that many modifications, both to materials and methods, may
be practiced without departing from the purpose and interest of
this invention.
[0138] For the in vivo study portions, the following general
procedures were used for sample analysis unless otherwise
indicated. Blood samples (5-10 mLs with sodium heparin as
anticoagulant) were taken prior to dosing and at specific intervals
after dosing. (typically between 12 and 16 hours). All blood
samples were chilled and centrifuged within 30 minutes of being
drawn. The plasma was separated, transferred to a polypropylene
tube, frozen at -20.degree. C. or below and stored frozen until
being shipped for drug analysis. The plasma samples were then
analyzed by a fully validated HPLC method. This resulting plasma
concentration v. time data was subjected to pharmacokinetic
analysis using non-compartmental analysis with Winnonlin 1.5.
[0139] When necessary, volunteers were then given at least a seven
day washout period (where no guaifenesin was administered to them
under the study) prior to being crossed-over to the next treatment
group. Generally, the subjects weighed within 15% of their Ideal
Body Weight as defined by the 1983 Metropolitan Life chart.
Example 1
[0140] A batch of sustained release guaifenesin tablets, Lot No.
7LB-31FC, with the following composition was prepared:
TABLE-US-00005 Components Weight per Tablet Guaifenesin DC 1260 mg
Methocel E10M 30 mg Emerald Green Lake 4 mg Magnesium Stearate 6.8
mg Opadry Y-S-3-7413 13.01 mg
[0141] Another batch of sustained release guaifenesin tablets, Lot
No. 7LB-32FC, with the following composition was prepared:
TABLE-US-00006 Components Weight per Tablet Guaifenesin DC 1260 mg
Methocel E10M 30 mg Carbopol 974P 15 mg Emerald Green Lake 4 mg
Magnesium Stearate 6.8 mg Opadry Y-S-3-7413 13.16 mg
[0142] Six tablets from Lot 7LB-31FC and six tablets from Lot
7LB-32FC were tested for in vitro guaifenesin release using an
Acid/Base dissolution (slightly modified USP 23/NF 18<711>
Drug Release using Apparatus 2). Six dissolution vessels of a USP
calibrated Hanson dissolution bath, equipped with shafts and
paddles, were filled with 675 mL of 0.1N hydrochorlic acid at
37.0.degree. C. The bath and vessels were maintained at a
temperature of 37.0.+-.0.5.degree. C. throughout the 12 hour
dissolution test. The paddles were set to rotate at 50 RPM and
slowly lowered into the vessels. One tablet of lot 7LB-31 was then
dropped into each vessel.
[0143] At the one hour and two hour intervals of testing, 5 mL
samples of dissolution solution were withdrawn from each vessel and
filtered through a 10 micron polyethylene filter into glass HPLC
vials. Immediately after the two hour samples were withdrawn, 225
mL of 0.2M sodium phosphate tribasic was added to each vessel to
increase the solution pH to about 6.8. The dissolution was run for
ten additional hours, 2.0 mL samples being withdrawn from each
vessel at the four, eight, 10, and 12 hour intervals. The filtered
samples were then run on an HPLC to determine percent guaifenesin
released.
[0144] The same dissolution testing procedure was performed for lot
7LB-32 FC. The lots gave dissolution profiles shown below and
depicted in FIG. 4. Lot 7LB-31
TABLE-US-00007 Vessel No. 1 hr. 2 hr. 4 hr. 8 hr. 10 hr. 12 hr. 1
26 38 55 77 84 88 2 27 39 54 75 81 86 3 22 37 50 73 78 85 4 23 33
47 64 73 79 5 25 36 52 75 81 86 6 24 35 49 74 81 87 Average 24.5
36.3 51.2 73.0 79.7 85.2
Lot 7LB-32FC
TABLE-US-00008 [0145] Vessel No. 1 hr. 2 hr. 4 hr. 8 hr. 10 hr. 12
hr. 1 25 36 42 54 59 64.0 2 24 35 42 55 61 66 3 26 38 45 59 65 69 4
24 35 42 54 60 65 5 24 36 43 54 59 64 6 23 34 38 50 55 59 Average
24.3 35.7 42.0 54.3 59.8 64.5
[0146] Both formulations demonstrated sustained release of
guaifenesin over a 12 hour period. Lot 7LB-32FC demonstrated
identical release properties to Lot 7LB-31FC in 0.1N HCl. In
buffered solution, however, Lot 7LB-32FC, the lot comprising a 2:1
ratio of Methocel E10M to Carbopol 974P, demonstrated a
statistically slower release than Lot 7LB-31FC, comprising Methocel
E10M and no Carbopol 974P. A slower release rate in vitro
translates to a slower, more controlled release with longer drug
action in vivo--a favorable characteristic for pharmaceutical
products containing a high concentration of an active ingredient
with a short half-life (e.g. guaifenesin).
Example 2
[0147] A dissolution study was run to compare dissolution profiles
of lots 7LB-32FC and 7LB-31FC with currently available guaifenesin
dosage forms. One immediate release tablet, ORGANIDIN NR, and two
sustained release tablets, HUMIBID L.A. and DURATUSS, were
subjected to the same dissolution study as described for lots
7LB-31FC and 7LB-32FC in Example 1 above. The following is a
summary of the results which are also depicted in FIG. 5.
TABLE-US-00009 Duratuss Organidin NR Humibid LA % guaifenesin %
guaifenesin released % guaifenesin released released 1 hr. 100 36
24 2 hr. 103 51 35 4 hr. 104 72 47 8 hr. 103 91 75 10 hr. 103 96 86
12 hr. 105 100 92
[0148] The immediate release Organidin released 100% of guaifenesin
content within the first hour of dissolution. The two commercial
sustained release dosage forms demonstrated a slower release of
guaifenesin. However, both the Humibid LA and Duratuss released
guaifenesin more rapidly than either Lot 7LB-31FC or 7LB-32FC,
particularly after the eight hour interval. Both Humibid LA and
Duratuss would, therefore, exhibit a faster rate of release and
thus a shorter lived therapeutic effect in vivo.
Example 3
[0149] The in vivo behavior of sustained release tablets of Lot
7LB-31FC and Lot 7LB-32FC from Example 1 were compared to the in
vivo behavior of an immediate release formulation (Organidin NR).
The open-label study involved 9 healthy volunteers averaging
38.+-.11.01 years of age with a range of 23 years to 55 years of
age. The subjects weighed 175.56.+-.24.22 lbs. with a range of 143
to 210 lbs. One subject was female and the remainder were male.
Each subject received either one 1200 mg dose of 7LB-31FC, 7LB-32FC
or a commercial 400 mg immediate release tablet (every four hours
for 3 doses).
[0150] The results of the pharmacokinetic parameters analysis are
described below and depicted in FIG. 6.
TABLE-US-00010 AUC.sub.0-12 AUC.sub.inf Sub- T.sub.max C.sub.max
(hr- T.sub.1/2 (hr- ject Formulation (hr.) (ng/mL) ng/mL) (hrs.)
ng/mL) 1 7LB-31FC 2.00 827.02 4817.20 4.64 6339.25 2 7LB-31FC 1.50
834.65 4695.89 2.71 5291.71 3 7LB-31FC 1.50 802.44 4142.14 3.44
4728.33 4 7LB-32FC 0.75 625.48 3034.31 5.78 5134.35 5 7LB-32FC 1.00
1052.00 5872.46 5.99 8298.33 6 7LB-32FC 2.00 1372.00 7924.35 5.53
9557.78 7 Organidin NR 0.50 2140.00 6921.94 0.86 7009.68 8
Organidin NR 4.25 18.17.00 6598.26 0.73 6674.65 9 Organidin NR 0.50
2831.00 9389.76 0.81 9570.91 Mean 7LB-31FC 1.67 821.37 4551.74 3.59
5453.10 Mean 7LB-32FC 1.25 1016.49 5610.37 5.77 7663.49 Mean
Organidin 1.75 2262.67 7636.65 0.80 7751.74 NR Ratio 7LB-31FC/IR
95.43 36.30 59.60 448.27 70.35 (%) Ratio 7LB-32FC/IR 71.43 44.92
73.47 718.92 98.86 (%)
[0151] Subjects given the 1200 mg formulation 7LB-32FC reached
maximum plasma guaifenesin concentrations of 1016 ng/mL in 1.25
hours and had an AUC.sub.inf of 7663 hr-ng/mL. The subjects given
formulation 7LB-31FC reached maximum plasma guaifenesin
concentrations of 821 ng/mL in 1.67 hours and had an AUC.sub.inf of
5453 hr-ng/mL. The subjects given the immediate release
formulation, Organidin NR, reached maximum plasma guaifenesin
concentrations of 2263 ng/mL in 1.75 hours (2 subjects peaked at
0.5 hours after the first dose and the third peaked at 0.25 hours
after the second dose at 4 hours) and had an AUC.sub.inf of 7752
hr-ng/mL. The two controlled release formulations demonstrated
sustained release in that their half-lives were longer, 5.77 hours
for the 7LB-32FC and 3.59 hours for the 7LB-31 FC compared to 0.8
hours for the immediate release formulation, Organidin NR.
[0152] Both formulations 7LB-32FC (with both Methocel E10M and
Carbopol 974P) and 7LB-31FC (with Methocel E10M only) control the
release of guaifenesin from the tablet compared to the immediate
release Organidin NR. Formulation 7LB-32FC, the formulation
containing a 6:1 ratio of Methocel E10M to Carbopol 974P, had the
longest half life at 5.77 hours with the largest AUC.sub.inf
between the two sustained release formulation. However, both
sustained release formulations have a C.sub.max less than half of
the C.sub.max of the immediate release Organidin NR.
Example 4
[0153] Three different sustained release tablet lots of guaifenesin
alone were prepared: i) Formulation I--1200 mg SR; ii) Formulation
II--400 mg IR and 800 mg SR; and iii) Formulation III--600 mg IR
and 600 mg SR.
Non-Layered Tablet (Sustained Release)
TABLE-US-00011 [0154] Formulation I Components Weight per Tablet
Guaifenesin DC 1260 mg Methocel E10M 40 mg Carbopol 974P 20 mg
Emerald Green Lake 4 mg Magnesium Stearate 6.8 mg
Bi-Layered Tablets (Sustained Release and Immediate Release)
Immediate Release Layer
TABLE-US-00012 [0155] Formulation II Formulation III Components
Weight per Tablet Weight per Tablet Guaifenesin DC 421 mg 630.8 mg
Microcrystalline Cellulose 40 mg 353 mg (Avicel) Sodium Starch
Glycolate 60 mg 90.1 mg (Explotab) Magnesium Stearate 2 mg 3 mg
Sustained Release Layer
TABLE-US-00013 [0156] Formulation II Formulation III Components
Weight per Tablet Weight per Tablet Guaifenesin DC 842 mg 630.8 mg
Methocel E10M 27 mg 40 mg Carbopol 974P 13.5 mg 20 mg Emerald Green
Lake 3 mg 4 mg Magnesium Stearate 4.5 mg 6.8 mg
[0157] The in vivo behavior of each of the three sustained release
tablets and a commercial immediate release formulation (Organidin
NR) were compared. The open-label study involved 15 healthy
volunteers averaging 31.67.+-.11.89 years of age with a range of 20
years to 51 years of age. The subjects weighed 162.00.+-.25.05 lbs.
with a range of 123 to 212 lbs. All 15 subjects were administered
400 mg of the immediate release formulation every 4 hours for a
total of 12 hours in on one day. On another day, 5 subjects were
administered Sustained Formulation I, another 5 subjects were
administered Sustained Formulation II, and yet another 5 subjects
were administered Sustained Formulation III.
[0158] The results of the pharmacokinetic parameters analysis are
described below and depicted in FIG. 7.
TABLE-US-00014 AUC.sub.0-12 AUC.sub.inf T.sub.max C.sub.max (hr-
T.sub.1/2 (hr- Formulation (hr.) (ng/mL) ng/mL) (hrs.) ng/mL) Mean
Organidin NR 0.90 2609.40 8768.40 1.28 9082.78 Mean Formulation I
2.30 1631.40 5549.30 2.88 6044.93 Mean Formulation II 2.30 2415.40
7304.38 1.48 7509.78 Mean Formulation III 1.95 2938.00 8904.62 2.05
9161.03
[0159] Sustained Formulations II and III exhibited a C.sub.max more
comparable to the immediate release formulation and an increased
AUC.sub.inf from that of the non-layered Sustained Formulation I.
The half-lives of both Sustained Formulation II and III were
reduced from the half-life of Sustained Formulation I. These
bi-layer tablets, however, showed an improved serum concentration
of guaifenesin and an increased overall concentration with
time.
Example 5
[0160] A dissolution study was run to compare dissolution profiles
of Formulation I, Formulation II and Formulation III prepared as
defined in Example 4 above, and Formulation W, a bi-layer tablet
lot with 200 mg IR and 1000 mg SR prepared with the following
composition:
Immediate Release Layer
TABLE-US-00015 [0161] Formulation IV Components Weight per Tablet
Guaifenesin DC 211 mg Microcrystalline Cellulose 118 mg (Avicel)
Sodium Starch Glycolate 30 mg (Explotab) Magnesium Stearate 1
mg
Sustained Release Layer
TABLE-US-00016 [0162] Formulation IV Components Weight per Tablet
Guaifenesin DC 1053 mg Methocel E10M 25 mg Carbopol 974P 12.5 mg
Emerald Green Lake 3.3 mg Magnesium Stearate 5.7 mg
The following is a summary of the results which are also depicted
in FIG. 8.
TABLE-US-00017 Formulation I Formulation II Formulation III
Formulation IV % released % released % released % released 1 hr. 22
45 38 29 2 hr. 34 54 46 38 4 hr. 43 65 56 48 6 hr. 50 70 61 53 8
hr. 58 73 66 60 10 hr. 62 78 70 66 12 hr. 66 81 75 71
[0163] Formulation I, the non bi-layered tablet, demonstrated the
slowest release of guaifenesin. Formulation II and Formulation III
had the fastest rates of release and would, therefore, exhibit a
faster rate of release and thus a shorter lived therapeutic effect
in vivo. Formulation IV has a rate of release which was faster than
Formulation I, comprising no immediate release blend, but slower
than Formulation II and Formulation III, both comprising more
immediate release blend than Formulation IV.
Example 6
[0164] The in vivo behavior of Formulation IV bi-layered tablets,
prepared as described above in Example 5, was compared to an
immediate release formulation (Organidin NR). The open-label,
multiple dose, randomized, 2-way crossover study involved 26
healthy volunteers averaging 31.31.+-.9.81 years of age with a
range of 19 years to 50 years of age. The subjects weighed
166.77.+-.29.83 lbs. The subjects were placed into one of two
treatment groups. Group 1 received Formulation IV tablet with 240
mL of water after an overnight fast every 12 hours for 5 days and a
single dose on day 6. Group 2 received 400 mg of Organidin NR
(2.times.200 mg tablets) with 240 mL of water every 4 hours for 5
days and one 400 mg dose every four hours for a total of 3 doses on
day 6.
[0165] Blood samples (5 mL with sodium heparin as anticoagulant)
were taken prior to dosing on days 1, 4, 5, and 6. On Day 1,
additional blood samples (5 mL with sodium heparin as
anticoagulant) were also obtained at 0.5, 0.75, 1, 1.5, 2, 3, 4,
4.5, 4.75, 5, 5.5, 6, 7, 8, 8.5, 8.75, 9, 9.5, 10. 11, and 12 hours
after the initial dose. On Day 6, additional blood samples (5 mL
with sodium heparin as anticoagulant) were also obtained at 0.5,
0.75, 1, 1.5, 2, 3, 4, 4.5, 4.75, 5, 5.5, 6, 7, 8, 8.5, 8.75, 9,
9.5, 10, 11, 12, 14, 16, and 24 hours after the initial dose.
[0166] The results of the pharmacokinetic parameters analysis are
below.
Averaged Testing--11 Twelve-Hour Intervals
TABLE-US-00018 [0167] AUC.sub.0-12 AUC.sub.inf T.sub.max C.sub.max
(hr- T.sub.1/2 (hr- Formulation (hr.) (ng/mL) ng/mL) (hrs.) ng/mL)
Mean Organidin NR 1.69 2463.20 8381.93 0.78 8528.51 Mean
Formulation IV 1.05 2111.38 7875.68 3.31 8686.08
The results of the testing are depicted in FIG. 9.
Steady State Testing
TABLE-US-00019 [0168] AUC.sub.0-12 AUC.sub.inf T.sub.max C.sub.max
(hr- T.sub.1/2 (hr- Formulation (hr.) (ng/mL) ng/mL) (hrs.) ng/mL)
Mean Organidin NR 2.03 2278.20 7751.23 0.88 7962.14 Mean
Formulation IV 0.86 2349.6 8202.47 3.61 9259.24
[0169] The results of the testing are depicted in FIG. 10.
[0170] The 200/1000 mg bi-layered tablet exhibited a C.sub.max and
a AUC.sub.inf equivalent to that of the immediate release blend, a
short T.sub.max and an extended half-life. Thus, a bi-layered
tablet with 200 mg guaifenesin in the immediate release formulation
and 1000 mg of guaifenesin in the sustained release formulation
results in a tablet which delivers a high serum concentration in a
short period of time, yet maintains an effective concentration of
guaifenesin in the blood stream for a full twelve hours.
Example 7
[0171] A study was performed to examine the relative
bioavailability of two different dosage strengths of modified
release guaifenesin formulations of the invention as well as the
effect of food on the relative bioavailability of a guaifenesin
formulation of the invention in normal, healthy male and/or female
volunteers. Two batches of guaifenesin bi-layer tablets, one 600 mg
and one 1200 mg, were prepared.
Immediate Release Layer
TABLE-US-00020 [0172] 600 mg Tablet 1200 mg Tablet Weight per
Weight per Components 200,000 Tablets 100,000 Tablets Guaifenesin
DC 21.05 kg 21.05 kg Microcrystalline Cellulose 11.75 kg 11.75 kg
(Avicel PH102) Sodium Starch Glycolate 3.00 kg 3.00 kg (Explotab)
Magnesium Stearate 0.10 kg 0.10 kg
Sustained Release Layer
TABLE-US-00021 [0173] 600 mg Tablet 1200 mg Tablet Weight per
Weight per Components 200,000 Tablets 100,000 Tablets Guaifenesin
DC 105.27 kg 105.27 kg Hydroxypropyl Methyl 2.50 kg 2.50 kg
Cellulose (Methocel E10M) Carbomer (Carbopol 974P) 1.25 kg 1.25 kg
FD&C Blue No. 1 0.33 kg 0.33 kg Aluminum Lake Dye Magnesium
Stearate 0.57 kg 0.57 kg
[0174] The 600 mg and 1200 mg tablets were similarly prepared, the
with the exception of the number of tablets produced from the
amount of materials used.
[0175] The in vivo behaviors of a 600 mg tablet administered to
volunteers in the fasting state (about 10 hours pre-dose until
about 4 hours after dosing), the 1200 mg tablet administered to
volunteers in the fasting state (about 10 hours pre-dose until
about 4 hours after dosing), and the 1200 mg tablet administered to
volunteers after a high fat meal (consumed within 30 minutes of
dosing) were compared. The open-label study involved 27 healthy
volunteers between the ages of 18 and 55. The 27 volunteers were
divided into 3 treatment groups, 9 receiving the 600 mg tablet, 9
receiving the 1200 mg tablet while fasting, and 9 receiving a 1200
mg tablet after consuming a high fat meal for Period 1 of the
trial. After completion of Period 1, the volunteers were
crossed-over for Period 2 (e.g. so that the 9 volunteers who had
been receiving the 600 mg tablet in Period 1 received the 1200 mg
tablet while fasting in Period 2). After completion of Period 2,
the volunteers were crossed-over again into their 3rd and final
treatment group (i.e. the 9 volunteers who received the 1200 mg
tablet while fasting in Period 2 and the 600 mg tablet while
fasting in Period 1 received the 1200 mg tablet after consumption
of a high fat meal in Period 3). Each volunteer was administered
one dose of the appropriate tablet and then monitored over a 16
hour period.
[0176] Blood samples were taken about one hour prior to dosing and
at specific intervals up to 16 hours after dosing (at 0.25, 0.5,
0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12, 14, and 16 hours). The results
of the pharmacokinetic parameters analysis are described below and
in FIG. 11.
TABLE-US-00022 AUC.sub.0-12 AUC.sub.inf T.sub.max C.sub.max (hr-
T.sub.1/2 (hr- Formulation (hr.) (ng/mL) ng/mL) (hrs.) ng/mL) Mean
600 mg Fasted 0.81 1074.26 3623.03 2.33 3676.23 Mean 1200 mg Fasted
0.94 1948.62 7483.20 3.33 7912.61 Mean 1200 mg Fed 2.18 1988.08
7424.20 0.91 7425.29
[0177] The 600 mg tablet demonstrated a serum profile approximately
directly proportional to the serum profile of the 1200 mg tablet.
The C.sub.max of the 600 mg tablet was about 55% that of the 1200
mg tablet. The AUC.sub.0-12 of the 600 mg tablet was about 48% that
of the 1200 mg tablet and the AUC.sub.inf of the 600 mg tablet was
about 46% that of the 1200 mg. improved serum concentration of
guaifenesin and an increased overall concentration with time, their
half-life was compromised.
[0178] The 1200 mg tablet demonstrated that the bi-layer tablets of
the invention greatly reduce the food effect in bioavailability and
serum concentration of guaifenesin. The C.sub.max of the 1200 mg
tablet administered after a high fat meal (fed tablet) was about
102% of the C.sub.max of the 1200 mg tablet administered after
fasting (fasted tablet). The AUC.sub.0-12 of the 1200 mg fed tablet
was about 99% that of the fasted tablet and the AUC.sub.inf of the
1200 mg fed tablet was about 94% that of the fasted tablet.
Example 8
[0179] In an example of a combination drug formulation, two batches
of guaifenesin/dextromethorphan HBr bi-layer tablets were prepared:
i) 600 mg/30 mg dextromethorphan and ii) 1200 mg/60 mg. In the 30
mg dextromethorphan tablet 7.5 mg was within the immediate release
layer and 22.5 mg within the sustained release layer. The 60 mg
dextromethorphan tablet comprised double the dextromethorphan
respectively.
[0180] Sustained Release Layer
TABLE-US-00023 600 mg/30 mg 1200 mg/60 mg Weight per Weight per
200,000 tablets 100,000 tablets Components (kg) (kg) Guaifenesin,
USP 101.00 101.00 Dextromethorphan HBr 4.50 4.50 Carbopol 974P, NF
1.50 5.00 Microcrystalline Cellulose 5.00 1.50 (Methocel E10M)
D&C Yellow No. 10 0.04 0.04 Aluminum Lake (14-18%) Magnesium
Stearate 1.00 1.0
[0181] Immediate Release Layer
TABLE-US-00024 600 mg/30 mg 1200 mg/60 mg Weight per Weight per
480,000 tablets 240,000 tablets Components (kg) (kg) Guaifenesin,
USP 45.60 45.60 Dextromethorphan HBr 3.60 3.60 Sodium Starch
Glycolate, 3.60 3.60 NF (Explotab) Microcrystalline Cellulose 40.32
40.32 (Avicel PH102) Methocel E10M, USP 2.40 2.40 Magnesium
Stearate, NF 0.48 0.48
[0182] The following is a summary of 1200 mg guaifenesin/60 mg
dextromethorphan HBr Dissolution Rate for three different batches
also depicted in FIG. 12.
TABLE-US-00025 PB01-H30 (clinical batch) PB01-H43 PB01-H44 %
released % released % released 1 hr 46 47 47 2 hr 59 60 61 6 hr 73
74 76 12 hr 86 87 89
[0183] The in vivo behavior of the 1200 mg guaifenesin and 60 mg
tablet was studied by measuring the plasma concentration of
guaifenesin, dextromethorphan HBr, and the metabolite dextrorphan.
FIGS. 13-15 illustrate the plasma concentration for each drug or
metabolite in two formulations, Formulation B and Formulation C,
during a 24 hour period. Immediately after administration the
plasma concentration of guaifenesin peaks in about an hour,
followed by a gradual plasma concentration decrease over 24 hours.
Immediately after administration, guaifenesin plasma concentration
never decreased to less than 200 ng/mL over 12 hours. Thereafter,
guaifenesin plasma concentration gradually decreased over the next
12 hours. Plasma concentration of dextromethorphan HBr peaks at
about 6 hours at about 12 ng/mL and the concentration is maintained
for the following 19 hours.
[0184] Formulations B and C of FIG. 13, exhibited guaifenesin
release profiles similar to the reference formulation. The
reference formulation for FIG. 13 was Formulation IV of Example 5.
Formulation B comprised 77% guaifenesin by weight, 3.8% by weight
dextromethorphan, 9.1% by weight microcrystalline cellulose, 1.9%
by weight Methocel E10M, and 0.9% Carbopol.RTM. 974P. Formulation C
comprised 76.5% by weight guaifenesin, 3.8% by weight
dextromethorphan, 9.7% by weight microcrystalline cellulose, 1.9%
by weight Methocel E10M, and 0.9% by weight Carbopol.RTM. 974P.
Formulations B and C exhibited similar behavior and had a
guaifenesin release profile similar to the reference formulation.
Accordingly, the combination formulations of the invention did not
interfere with the release of guaifenesin. In particular, after 12
hours Formulation C released a greater dose of guaifenesin than the
reference formulation.
[0185] Formulations B and C of FIG. 13 were compared against a
reference consisting of an extended release formulation of
dextromethorphan commercially available under the name Delsym sold
by Celltech. The comparison was carried out to determine the
behavior of guaifenesin-dextromethorphan formulations of the
invention as compared to separately administered combination
formulations of dextromethorphan. Formulations B and C had longer
dextromethorphan release profiles than the reference, as shown in
FIG. 14. Additionally, the combined formulations of the inventions
had no detrimental effect upon the release profile of
dextromethorphan.
[0186] Another method to monitor dextromethorphan plasma
concentrations is to measure the plasma concentration of the
metabolite dextrorphan. The plasma concentration of dextrorphan
metabolite of the reference formulation and Formulations B and C of
FIG. 14 were plotted in FIG. 15. Generally, the formulations
exhibited similar dextrorphan concentrations, with Formula C
exhibiting the highest dextrorphan concentration after 12 hours.
FIG. 15 demonstrates that the formulations of the invention
containing guaifenesin do not inhibit the release of
dextromethorphan, as determined by measuring the presence of the
metabolite dextrorphan.
Example 9
[0187] A study was performed to examine the relative
bioavailability of a sustained release guaifenesin with
dextromethorphan formulation of the invention with normal, healthy
male and/or female volunteers. A batch of guaifenesin and
dextromethorphan bi-layer tablet, 1200 mg, was prepared according
to the composition described above for Example 8.
[0188] The in vivo behaviors of the 1200 mg tablet administered to
volunteers in the fasting state (about 10 hours pre-dose until
about 4 hours after dosing) was determined. The open-label study
involved 29 healthy volunteers between the ages of 18 and 55. The
29 volunteers were divided into two treatment groups half receiving
the 1200 mg tablet while fasting for Period 1 of the trial. Each
volunteer was administered one dose of the appropriate tablet and
then monitored over a 16 hour period.
[0189] Blood samples (7 mL with sodium heparin as anticoagulant)
were taken about one hour prior to dosing and at specific intervals
up to 16 hours after dosing (at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4,
6, 8, 10, 12, 14, and 16 hours). The results of the pharmacokinetic
parameters analysis for guaifenesin include a T.sub.max of 1.48 hr,
C.sub.max (ng/mL) of 2196, AUC.sub.0-12 (hr-ng/mL) of 8702,
T.sub.1/2 of 1.32 hrs., and an AUC.sub.inf (hr-ng/mL) of 8732.5.
The results of the pharmacokinetic parameters analysis for
dextromethorphan include a T.sub.max of 5.0 hrs, C.sub.max (pg/mL)
of 5157, AUC.sub.0-12 (hr-pg/mL) of 74209, T.sub.1/2 of 7.93 hrs.,
and an AUC.sub.inf (hr-pg/mL) of 75016.
Example 10
[0190] In another example of a combination formulation, two batches
of guaifenesin-pseudoephedrine HCl bi-layer tablets, one 600 mg and
one 1200 mg, were prepared in the following amounts.
Sustained Release Layer
TABLE-US-00026 [0191] 600 mg/60 mg 1200 mg/120 mg Weight per Weight
per 300,000 tablets 150,000 tablets Components (kg) (kg)
Guaifenesin DC (95%) 157.90 157.89 Pseudoephedrine HCl 18.0 18.00
Hydroxypropyl 4.50 4.50 Methylcellulose (Methocel E10M) Carbopol
974P, NF 2.25 2.25 FD&C Yellow No. 6 0.24 0.06 Aluminum Lake
(15-18%) Magnesium Stearate 1.50 1.50
Immediate Release Layer
TABLE-US-00027 [0192] 600 mg/60 mg 1200 mg/120 mg Weight per Weight
per 300,000 tablets 150,000 tablets Components (kg) (kg)
Guaifenesin DC (95%) 39.476 39.476 Microcrystalline Cellulose
22.028 22.028 (Avicel PH102) Sodium Starch Glycolate 5.626 5.626
Magnesium Stearate, NF 0.188 0.188
[0193] The following is a summary of 1200 mg guaifenesin/120 mg
pseudoephedrine dissolution rates also depicted in FIG. 16.
TABLE-US-00028 PB01-M65 (clinical batch) PB01-M68 PB01-M71 %
released % released % released 1 hr 45 44 43 2 hr 60 59 58 6 hr 89
87 82 12 hr 97 98 96
[0194] The in vivo behavior of the 1200 mg guaifenesin and 120 mg
pseudoephedrine tablet was studied by measuring the plasma
concentration of guaifenesin, and pseudoephedrine HCl. The three
batches of the 1200 mg guaifenesin/120 mg pseudoephedrine HCl
formulation were dissolved to determine the amount of
pseudoephedrine HCl released over time. Generally, the formulations
had 1200 mg of guaifenesin and 120 mg pseudoephedrine HCl and were
studied over a 12 hour period. The released amount of
pseudoephedrine HCl was determined as a weight percent of dissolved
pseudoephedrine HCl in contrast to the total weight of
pseudoephedrine HCl prior to dissolution. After 1 hour about 43% to
45% of the pseudoephedrine HCl had dissolved. After 2 hours the
about 58% to 60% dissolved, after 6 hours 82% to 89% had dissolved,
and after 12 hours about 96% to 97% by weight of the
pseudoephedrine HCl had dissolved. (See FIG. 16).
[0195] Three formulations of guaifenesin, two containing an
additional drug, pseudoephedrine, were compared to determine
whether an additional drug affects the release profile of
guaifenesin. FIGS. 17-18 illustrate the plasma concentration for
each drug (Formulation B and Formulation C) during a 24 hour
period. Immediately after administration the plasma concentration
of guaifenesin peaks in about an hour, followed by a gradual plasma
concentration decrease over 24 hours. Immediately after
administration, guaifenesin plasma concentration never decreased
below 200 ng/mL over 12 hours. Thereafter, guaifenesin plasma
concentration gradually decreased over the next 12 hours. Plasma
concentration of pseudoephedrine HCl peaked at about 6 hours and
gradually decreased over the next 18 hours. The plasma
concentration of pseudoephedrine HCl never decreased to less than
50 ng/mL after 30 minutes of administration.
[0196] In FIG. 17, the reference formulation included formulation
IV of Example 5 and a separate Sudafed.RTM. 12 hour formulation
available from Pfizer Inc. 201 Tabor Road, Morris Plains, N.J.,
07950. The reference formulation was compared to Formulation B and
Formulation C of the invention. Formulation B comprised a sustained
release formulation having 86% by weight Guaifenesin DC, 9.8% by
weight pseudoephedrine HCl, 2.4% by weight hydroxypropyl
methylcellulose, and 1.2% by weight Carbopol.RTM. 974P, and an
immediate release formulation having 52% by weight Guaifenesin DC
and 39% by weight microcrystalline cellulose by weight. Formulation
C comprised 77% by weight Guaifenesin DC, 7.7% by weight
pseudoephedrine, 9% by weight microcrystalline cellulose, 1.8% by
weight Methocel E10M, and 0.9% by weight Carbopol.RTM. 974P.
Formulations B and C exhibited similar behavior to separately
administered formulations, thus demonstrating that formulations of
the invention did not interfere with the profile release of
pseudoephedrine.
[0197] The plasma concentration for pseudoephedrine HCl was studied
to determine whether the formulations of the invention interfered
with the release profile of pseudoephedrine. The pseudoephedrine
plasma concentrations for the formulations of FIG. 17 were plotted
over a 24 hour period. As illustrated in FIG. 18, Formulations B
and C of FIG. 17 exhibited higher pseudoephedrine concentrations
than the reference formulation. Thus, the combined formulations of
the invention release pseudoephedrine in comparable or better
release profiles than formulations containing pseudoephedrine
alone.
Example 11
[0198] A study was performed to examine the relative
bioavailability of sustained release guaifenesin with
pseudoephedrine formulations of the invention in normal,
volunteers. A batch of guaifenesin and pseudoephedrine bi-layer
tablets, 1200 mg, was prepared according to the composition
described above for Example 10.
[0199] The in vivo behaviors of a 1200 mg tablet administered to
volunteers in the fasting state (about 10 hours pre-dose until
about 4 hours after dosing) were compared. The open-label study
involved 29 healthy volunteers between the ages of 18 and 55. The
29 volunteers were divided into two treatment groups, half
receiving the 1200 mg tablet while fasting for Period 1 of the
trial. Each volunteer was administered one dose of the appropriate
tablet and then monitored over a 16 hour period.
[0200] Blood samples (7 mL with sodium heparin as anticoagulant)
were taken about one hour prior to dosing and at specific intervals
up to 16 hours after dosing (at 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4,
6, 8, 10, 12, 14, and 16 hours). The results of the pharmacokinetic
parameters analysis for guiafenesin include a T.sub.max of 1.48 hr,
C.sub.max (ng/mL) of 2196, AUC.sub.0-12 (hr-ng/mL) of 8702,
T.sub.1/2 of 1.32 hrs., and an AUC.sub.inf (hr-ng/mL) of 8732.5.
The results of the pharmacokinetic parameters analysis for
pseudoephedrine include a T.sub.max of 6 hrs, C.sub.max (ng/mL) of
300, AUC.sub.0-12 (hr-ng/mL) of 4201, T.sub.1/2 of 5.98 hrs., and
an AUC.sub.inf (hr-ng/mL) of 4709.
Example 12
[0201] Guaifenesin and pseudoephedrine sustained release
formulations were compared to commercial controlled release
guaifenesin and pseudoephedrine products in healthy volunteers in
an open label, single dose, randomized, 3-way crossover study in 15
subjects.
[0202] The subjects were randomized and placed into one of three
treatment groups. Group A was given Formulation A, one 1200 mg
controlled release guaifenesin product (Mucinex) plus a 120 mg
controlled release pseudoephedrine hydrochloride product
(Sudafed--12 Hour) with 240 mL of water after an overnight fast.
Group B received Formulation B (lot PB01-K61), an experimental
controlled release tablet containing 1200 mg guaifenesin and 120 mg
of pseudoephedrine hydrochloride with 240 mL of water after an
overnight fast. Group C received Formulation C (lot CB00-01A),
another experimental controlled release tablet containing 1200 mg
guaifenesin and 120 mg pseudoephedrine hydrochloride with 240 mL of
water after an overnight fast. There was at least a 7-day washout
between doses.
[0203] The volunteers averaged 26.4.+-.10.57 years of age
(Mean.+-.Standard Deviation) with a range of 18 years to 50 years
of age. They were 66.93.+-.4.37 inches tall with a range of 60 to
74 inches. They weighed 160.87.+-.26.22 pounds with a range of 118
to 222 pounds. Seven were male (47%) and eight female (53%). Ten
(67%) of the subjects had a large frame size, three (20%) had a
medium frame and two (13%) had a small frame. Thirteen volunteers
(87%) were Caucasian and two (13%) were Multiracial. Blood (10 mL,
sodium heparin anticoagulant) was obtained at the following times:
Pre dose, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12, 14, 16 and 24
hours post dose.
[0204] Subjects given 1200 mg of guaifenesin as guaifenesin ER
(reference) reached a C.sub.max of 1847 ng/mL in 0.78 hours and had
an AUC.sub.inf of 7302 hr-ng/mL. Subjects given 1200 mg guaifenesin
as Formulation B reached a C.sub.max of 1784 ng/mL (103% of that of
the reference) in 0.82 hour (113% of that of the reference) and had
an AUC.sub.inf of 7602 hr-ng/mL (109% of that of the reference).
Subjects given 1200 mg guaifenesin as Formulation C reached a
C.sub.max of 1154 ng/mL (65% of that of the reference) in 1.22
hours (179% of that of the reference) and had an AUC.sub.inf of
7128 hr-ng/mL (100% of that of the reference).
[0205] Subjects given 120 mg pseudoephedrine hydrochloride as
Sudafed-12 Hour (reference) reached a C.sub.max of 300 ng/mL
(mean.+-.standard deviation) in 6 hours and had an AUC.sub.inf of
4710 hr-ng/mL. Subjects given 120 mg pseudoephedrine hydrochloride
as Formulation B reached a C.sub.max of 285 ng/mL (99% of that of
the reference) in 6 hours (101% of that of the reference) and had
an AUC.sub.inf of 4449 hr-ng/mL (100% of that of the reference).
Subjects given 120 mg pseudoephedrine hydrochloride as Formulation
C reached a C.sub.max of 256 ng/mL (86% of that of the reference)
in 8 hours (151% of that of the reference) and had an AUC.sub.inf
of 4444 hr-ng/mL (97% of that of the reference).
[0206] The plasma concentrations of guaifenesin are depicted in
FIG. 19. The resulting pharmacokinetic data is shown in Tables 1
through 4. The maximum plasma concentrations of guaifenesin
following a 1200 mg oral dose as Mucinex were 1847.+-.686.6 ng/mL
and occurred in 0.78.+-.0.28 hours. The resulting area under the
plasma concentration vs. time curve (AUC.sub.inf was 7302.+-.2866.4
hr-ng/mL. The maximum plasma concentrations of guaifenesin
following a 1200 mg oral dose as Formulation B were 1784.+-.549.9
ng/mL (102.93%.+-.36.57% of that of the reference formulation) and
occurred in 0.82.+-.0.27 hours (112.78%.+-.43.29% that of the
reference formulation). The resulting AUC.sub.inf was
7602.+-.2492.8 hr-ng/mL (108.67%.+-.23.93% of that of the reference
formulation). The maximum plasma concentrations of guaifenesin
following a 1200 mg oral dose as Formulation C were 1154.+-.523.3
ng/mL (64.56%.+-.28.03% of that of the reference formulation) and
occurred in 1.22.+-.0.45 hours (178.9%.+-.100.64% that of the
reference formulation). The resulting AUC.sub.inf was
7128.+-.3166.0 hr ng/mL (99.81%.+-.34.23% of that of the reference
formulation).
TABLE-US-00029 TABLE 1 Guaifenesin Pharmacokinetic Variables
Following the Administration of 1200 mg Guaifenesin as Mucinex
along with Sudafed 12 Hour to Normal Volunteers AUC.sub.0-t
AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life Clearance
Subject (ng/mL) (far) ng/mL) ng/mL) (hr) (L/hr) Mean 1847 0.78 7143
7302 3.60 188.98 Median 1530 0.75 5776 5863 3.21 204.68 Standard
686.63 0.28 2793.41 2866.39 2.05 74.55 Deviation Standard 183.51
0.08 746.57 766.08 0.55 19.92 Error % CV 37.18 35.92 39.11 39.26
56.94 39.45 Maximum 1847 0.78 7143 7302 3.60 188.98 Minimum 1530
0.75 5776 5863 3.21 204.68
TABLE-US-00030 TABLE 2 Guaifenesin Pharmacokinetic Variables
Following the Administration of 1200 mg Guaifenesin and 120 mg
Pseudoephedrine Hydrochloride as Formulation B to Normal Volunteers
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 1784
0.82 7557 7602 1.59 172.56 Median 1730 0.75 7297 7349 1.35 163.30
Standard 549.90 0.27 2487.33 2492.75 0.59 49.49 Deviation Standard
146.97 0.07 664.77 666.22 0.16 13.23 Error % CV 30.82 33.67 32.91
32.79 37.09 28.68 Maximum 1800 0.75 5818 5842 1.35 205.42 Minimum
1120 0.5 4952 4979 1.14 241.01
TABLE-US-00031 TABLE 3 Guaifenesin Pharmacokinetic Variables
Following the Administration of 1200 mg Guaifenesin and 120 mg
Pseudoephedrine Hydrochloride as Formulation C to Normal Volunteers
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 1154
1.22 6989 7128 2.40 202.57 Median 1050 1.00 6291 6314 2.38 190.05
Standard 523.29 0.45 3078.23 3165.98 1.06 89.63 Deviation Standard
139.86 0.12 822.69 846.14 0.28 23.96 Error % CV 45.35 37.14 44.04
44.41 44.30 44.25 Maximum 612 0.75 3157 3205 1.25 374.38 Minimum
781 0.75 4902 4949 2.49 242.46
TABLE-US-00032 TABLE 4 Ratio of Guaifenesin Pharmacokinetic
Variables Following the Administration of 1200 mg Guaifenesin and
120 mg Pseudoephedrine Hydrochloride as Formulation B Compared to
that of the Reference Formulation to Normal Volunteers (%)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean
102.93 112.78 110.31 108.67 66.51 95.42 Median 90.59 100.00 102.28
100.45 50.76 99.55 Standard 36.57 43.29 23.94 23.93 65.61 16.90
Deviation Standard 9.77 11.57 6.40 6.40 17.53 4.52 Error % CV 35.53
38.38 21.70 22.02 98.64 17.72 Maximum 165.14 75 122.87 121.60 83.97
82.24 Minimum 80 50 87.60 84.93 17.70 117.75
[0207] The plasma concentrations of pseudoephedrine are depicted in
FIG. 20. The resulting pharmacokinetic data is shown in Tables 5
through 9. The maximum plasma concentrations of pseudoephedrine
following a 120 mg oral dose as Sudafed-12 Hour (reference) were
300.3.+-.91.44 ng/mL and occurred in 6.+-.1.69 hours. The resulting
AUC.sub.inf was 4710.+-.1394.5 hr-ng/mL. The maximum plasma
concentrations of pseudoephedrine following a 120 mg oral dose as
Formulation B were 285.3.+-.53.28 ng/mL (99.3 1%.+-.20.39% of that
of the reference formulation) and occurred in 5.80.+-.2.40 hours
(101.11%.+-.41.77% of that of the reference formulation). The
resulting AUC.sub.inf was 4449.+-.1079.6 hr-ng/mL (99.87%.+-.26.40%
of that of the reference formulation). The maximum plasma
concentrations of pseudoephedrine following a 120 mg oral dose as
Formulation C were 256.4.+-.80.7 ng/mL (86.37%.+-.14.38% of that of
the reference formulation) and occurred in 8.27.+-.2.71 hours (5
1.11%.+-.73.25% of that of the reference formulation). The
resulting AUC.sub.inf was 4444.+-.1212.1 hr-ng/mL (96.78%.+-.17.90%
of that of the reference formulation).
TABLE-US-00033 TABLE 5 Pseudoephedrine Pharmacokinetic Variables
Following the Administration of 120 mg Pseudoephedrine
Hydrochloride as Sudafed-12 Hour along with 1200 mg Guaifenesin as
Mucinex to Normal Volunteers AUC.sub.0-t AUC.sub.inf Half-
C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr)
ng/mL) ng/mL) (hr) (L/hr) Mean 300.27 6.00 4201.62 4709.88 5.98
22.93 Median 287.00 6.00 4042.53 4601.31 5.19 21.37 Standard 91.44
1.69 1182.92 1394.49 1.68 7.77 Deviation Standard 24.44 0.45 316.15
372.69 0.45 2.08 Error % CV 30.45 28.17 28.15 29.61 28.01 33.87
Maximum 523 8 6518.45 7137.33 10.18 38.94 Minimum 183 4 2419.97
2524.37 4.29 13.77
TABLE-US-00034 TABLE 6 Pseudoephedrine Pharmacokinetic Variables
Following the Administration of 120 mg Pseudoephedrine
Hydrochloride and 1200 mg Guaifenesin as Formulation B to Normal
Volunteers AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr-
(hr- life Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr)
Mean 285.33 5.80 4080.27 4448.85 5.40 23.41 Median 269.00 6.00
3985.05 4463.18 5.21 22.03 Standard 53.28 2.40 946.92 1079.61 1.01
6.06 Deviation Standard 14.24 0.64 253.07 288.54 0.27 1.62 Error %
CV 18.67 41.32 23.21 24.27 18.64 25.88 Maximum 387 10 6003.14
6799.07 7.44 37.40 Minimum 215 2 2381.18 2628.19 3.85 14.46
TABLE-US-00035 TABLE 7 Pseudoephedrine Pharmacokinetic Variables
Following the Administration of 120 mg Pseudoephedrine
Hydrochloride and 1200 mg Guaifenesin as Formulation C to Normal
Volunteers AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr-
(hr- life Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr)
Mean 256.40 8.27 4008.32 4444.09 5.39 23.85 Median 226.00 10.00
3888.93 4266.92 5.15 23.04 Standard 80.71 2.71 1084.90 1212.13 1.10
7.16 Deviation Standard 21.57 0.72 289.95 323.96 0.29 1.91 Error %
CV 31.48 32.80 27.07 27.28 20.41 30.03 Maximum 448 10 6200.18
6756.67 8.66 40.05 Minimum 162 2 2360.01 2454.79 4.09 14.55
TABLE-US-00036 TABLE 8 Ratio of Pseudoephedrine Pharmacokinetic
Variables Following the Administration of 120 mg Pseudoephedrine
Hydrochloride and 1200 mg Guaifenesin as Formulation B Compared to
that of the Reference Formulation to Normal Volunteers (%)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 99.31
101.11 101.58 99.87 93.38 109.24 Median 94.74 100.00 104.95 101.63
90.66 98.40 Standard 20.39 41.77 24.96 26.40 17.54 40.60 Deviation
Standard 5.45 11.16 6.67 7.06 4.69 10.85 Error % CV 20.53 41.31
24.57 26.44 18.79 37.13 Maximum 140.40 200 139.07 144.72 120.84
234.43 Minimum 65.97 25 50.46 42.66 60.12 69.10
TABLE-US-00037 TABLE 9 Ratio of Pseudoephedrine Pharmacokinetic
Variables Following the Administration of 120 mg Pseudoephedrine
Hydrochloride and 1200 mg Guaifenesin as Formulation C Compared to
that of the Reference Formulation to Normal Volunteers (%)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 86.37
151.11 96.79 96.78 93.98 107.04 Median 85.66 133.33 98.75 99.37
96.77 100.63 Standard 14.38 73.25 14.24 17.90 21.06 22.01 Deviation
Standard 3.84 19.58 3.80 4.78 5.63 5.88 Error % CV 16.65 48.48
14.71 18.49 22.41 20.56 Maximum 115.30 250 126.82 132.10 129.45
153.94 Minimum 62.60 50 75.98 64.96 51.20 75.70
[0208] The data indicates that both formulations produce optimum
guaifenesin bioavailability (although Formulation B appears to more
closely match the reference) and Formulation B produces optimal
pseudoephedrine bioavailability.
Example 13
[0209] The bioavailability of a sustained release combination
formulation of 1200 mg guaifenesin and 120 mg Pseudoephedrine
Hydrochloride was used to examine the dose proportionality of
Pseudoephedrine normal volunteers compared to reference guaifenesin
and Pseudoephedrine Hydrochloride in an open label, single dose,
randomized, 3-way crossover study with 36 subjects. The example
also demonstrates the dose proportionality of pseudoephedrine.
[0210] The subjects were randomized and placed into one of three
treatment groups. Group I received Treatment A, a 1200 controlled
release guaifenesin product (Mucinex) plus a 120 mg controlled
release pseudoephedrine product (Sudafed.RTM. 12 Hour) with 240 mL
of water after an overnight fast (Reference). Group 2 received
Treatment B (PB01-M65A2), an experimental controlled release
formulation containing 1200 mg guaifenesin and 120 mg
pseudoephedrine hydrochloride with 240 mL of water after an
overnight fast (test). Group 3 received Treatment C (PB01-A12A), an
experimental controlled release formulation containing 600 mg
guaifenesin and 60 mg pseudoephedrine with 240 mL of water after an
overnight fast.
[0211] The volunteers averaged 23.06.+-.7.05 years of age
(Mean.+-.Standard Deviation) with a range of 18 years to 48 years
of age. They were 70.58.+-.3.08 inches tall with a range of 64 to
75 inches. They weighed 167.42.+-.26.14 pounds with a range of 114
to 229 pounds. Twenty-four were male (67%) and twelve female (33%).
Sixteen (44%) of the subjects had a large frame size, thirteen
(36%) had a medium frame and seven (19%) had a small frame.
Thirty-two volunteers (89%) were Caucasian, three (8%) were Black
and one (3%) Multiracial. Blood (10 mL, sodium heparin
anticoagulant) was obtained at the following times: Pre-dose, 0.5,
0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12, 14, 16 and 24 hours post dose
(the total blood loss for guaifenesin and pseudoephedrine analysis
will be 450 mL).
[0212] Subjects given 1200 mg of guaifenesin as Mucinex and 120 mg
pseudoephedrine hydrochloride as Sudafed.RTM. 12 Hour (Treatment A,
Reference) reached a C.sub.max of 1940 ng/mL in 0.77 hours and had
an AUC.sub.inf of 8061 hr-ng/mL. Subjects given 1200 mg guaifenesin
and 120 mg pseudoephedrine hydrochloride as Treatment B (Test)
reached a C.sub.max of 1813 ng/mL (98% of that of the reference) in
1.04 hour (140% of that of the reference) and had an
AUC.sub.0-.infin. of 8124 hr ng/mL (101% of that of the reference).
Subjects given 600 mg guaifenesin and 60 mg pseudoephedrine
hydrochloride as Treatment C reached a C.sub.max of 920 ng/mL (54%
of that of the reference) in 0.99 hours (116% of that of the
reference) and had an AUC.sub.inf of 3565 hr-ng/mL (46% of that of
the reference).
[0213] Subjects given 120 mg pseudoephedrine hydrochloride as
Sudafed.RTM. 12 Hour and 1200 mg guaifenesin as Mucinex (Treatment
A, Reference) reached a mean C.sub.max of 250 ng/mL in 6 hours and
had an AUC.sub.inf of 3847 hr-ng/mL. Subjects given 120 mg
pseudoephedrine and 1200 mg guaifenesin as an experimental
formulation (Treatment B, Test) reached a of 263 ng/mL (107% of
that of the reference) in 5 hours (85% of that of the reference)
and had an AUC.sub.inf of 3884 hr-ng/mL (103% of that of the
reference). Subjects given 60 mg pseudoephedrine hydrochloride and
600 mg guaifenesin in an experimental formulation (Treatment C)
reached a C.sub.max of 141 ng/mL (54% of that of Formulation B) in
5 hours (100% of that of Formulation B) and had an AUC.sub.inf of
1968 hr-ng/mL (50% of that of Formulation B).
[0214] Blood (10 mL, sodium heparin anticoagulant) was obtained at
the following times: Pre-dose, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8,
10, 12, 14, 16 and 24 hours post dose. Bioequivalence was examined
between the test (Treatment B--guaifenesin or pseudoephedrine
hydrochloride experimental formulation) and the reference
(Treatment A--guaifenesin or pseudoephedrine hydrochloride
reference formulations) groups. The dose response relationship was
also examined between the test (Treatment B-guaifenesin or
pseudoephedrine hydrochloride experimental formulation) and the
reference (Treatment C--guaifenesin or pseudoephedrine
hydrochloride reference formulations) groups.
[0215] The plasma concentrations of guaifenesin is depicted in FIG.
21. The resulting pharmacokinetic data is shown in Tables 10
through 14. The maximum plasma concentrations of guaifenesin
following a 1200 mg oral dose as Mucinex and 120 mg pseudoephedrine
hydrochloride as Sudafed.RTM. 12 Hour were 1940.+-.889 ng/mL and
occurred in 0.77.+-.0.22 hours. The resulting area under the plasma
concentration vs. time curve (AUC.sub.inf was 8061.+-.3329
hr-ng/mL. The maximum plasma concentrations of guaifenesin
following a 1200 mg oral dose as Treatment B were 1813.+-.900 ng/mL
(98.1%.+-.35.8% of that of the reference formulation) and occurred
in 1.04.+-.0.49 hours (140%.+-.65.3% that of the reference
formulation). The resulting AUC.sub.inf was 8124.+-.3677 hr-ng/mL
(101%.+-.19.3% of that of the reference formulation). The maximum
plasma concentrations of guaifenesin following a 600 mg oral dose
as Treatment C were 920.+-.481 ng/mL (54.3%.+-.20.2% of that of the
reference formulation) and occurred in 0.99.+-.0.46 hours
(116%.+-.78.7% that of the reference formulation). The resulting
AUC.sub.inf was 3565.+-.1442 hr-ng/mL (45.6%.+-.10.2% of that of
the reference formulation).
TABLE-US-00038 TABLE 10 Guaifenesin Pharmacokinetic Variables
Following the Administration of 1200 mg guaifenesin Mucinex along
with Sudafed 12 Hour to Normal Volunteers (%) AUC.sub.0-t
AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life Clearance
Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 1847 0.78 7143
7302 3.60 188.98 Median 1530 0.75 5776 5863 3.21 204.68 Standard
686.63 0.28 2793.41 2866.39 2.05 74.55 Deviation Standard 183.51
0.08 746.57 766.08 0.55 19.92 Error % CV 37.18 35.92 39.11 39.26
56.94 39.45 Maximum 1847 0.78 7143 7302 3.60 188.98 Minimum 1530
0.75 5776 5863 3.21 204.68
TABLE-US-00039 TABLE 11 Guaifenesin Pharmacokinetic Variables
Following the Administration of 1200 mg guaifenesin and 120 mg
Pseudoephedrine Hydrochloride as an Experimental Formulation to
Normal Volunteers (Treatment B, Test) AUC.sub.0-t AUC.sub.inf Half-
C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr)
ng/mL) ng/mL) (hr) (L/hr) Mean 1813 1.04 8002 8124 2.21 175 Median
1530 0.75 7036 7083 1.99 169 Standard 900 0.49 3677 3677 1.19 68.2
Deviation Standard 154 0.08 631 631 0.20 11.7 Error % CV 49.6 46.9
45.9 45.3 53.9 38.9
TABLE-US-00040 TABLE 12 Guaifenesin Pharmacokinetic Variables
Following the Administration of 600 mg Guaifenesin and 60 mg
Pseudoephedrine Hydrochloride to Normal Volunteers (Treatment C)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 920
0.99 3529 3565 1.76 192 Median 721 0.75 3078 3098 1.47 194 Standard
481 0.46 1437 1442 0.92 66.5 Deviation Standard 81.3 0.08 243 244
0.16 11.2 Error % CV 52.3 46.0 40.7 40.4 52.4 34.5
TABLE-US-00041 TABLE 13 Ratio of Guaifenesin Pharmacokinetic
Variables Following the Administration of 1200 mg Guaifenesin and
120 mg Pseudoephedrine Hydrochloride as Formulation B Compared to
that of the Reference Formulation (Treatment A) to Normal
Volunteers (%) AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max
(hr- (hr- life Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr)
(L/hr) Mean 98.1 140 104 101 66.2 103 Median 96.8 133 106 100 53.1
99.5 Standard 35.8 65.3 20.3 19.3 42.0 24.2 Deviation Standard 6.14
11.2 3.48 3.31 7.20 4.16 Error % CV 36.5 46.5 19.5 19.1 63.4
23.5
TABLE-US-00042 TABLE 14 Ratio of Guaifenesin Pharmacokinetic
Variables Following the Administration of 600 mg Guaifenesin and 60
mg Pseudoephedrine Hydrochloride (Treatment C) Compared to that of
(Treatment B) to Normal Volunteers (%) AUC.sub.0-t AUC.sub.inf
Half- C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL)
(hr) ng/mL) ng/mL) (hr) (L/hr) Mean 54.3 116 45.9 45.6 97.0 114
Median 48.8 100 43.9 44.0 86.1 114 Standard 20.2 78.7 10.6 10.2
61.6 23.2 Deviation Standard 3.47 13.50 1.82 1.75 10.57 3.98 Error
% CV 37.3 67.9 23.1 22.4 63.5 20.3
[0216] The plasma concentrations of pseudoephedrine are depicted in
FIG. 22. The resulting pharmacokinetic data is shown in Tables 15
through 19. The maximum plasma concentrations of pseudoephedrine
following a 120 mg oral dose as Sudafed.RTM. 12 Hour and 1200 mg
guaifenesin as Mucinex (Treatment A, Reference) were 250.+-.53.4
ng/mL and occurred in 6.29.+-.1.76 hours. The resulting AUC.sub.inf
was 3847.+-.910 hr-ng/mL. The maximum plasma concentrations of
pseudoephedrine following a 120 mg oral dose as an experimental
formulation (Treatment B) were 263.+-.58.5 ng/mL (107%.+-.18.9% of
that of the reference formulation) and occurred in 5.11.+-.1.78
hours (85.2%.+-.31.5% of that of the reference formulation). The
resulting AUC.sub.inf was 3884.+-.911 hr-ng/mL (103%.+-.20.2% of
that of the reference formulation). The maximum plasma
concentrations of pseudoephedrine following a 60 mg oral dose as an
experimental formulation (Treatment C) were 141.+-.30.3 ng/mL
(53.5%.+-.6.52% of that of Formulation B) and occurred in
4.94.+-.1.60 hours (99.5%.+-.25.9% of that of Formulation B). The
resulting AUC.sub.inf was 1968.+-.477 hr-ng/mL (50.5%.+-.8.77% of
that of Formulation B).
TABLE-US-00043 TABLE 15 Pseudoephedrine Pharmacokinetic Parameters
Following the Administration of 120 mg Pseudoephedrine
Hydrochloride as Sudafed .RTM. 12 Hour and 1200 mg Guaifenesin as
Mucinex to Normal Volunteers (Treatment A) AUC.sub.0-t AUC.sub.inf
Half- C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL)
(hr) ng/mL) ng/mL) (hr) (L/hr) Mean 250 6.29 3479 3847 5.75 27.1
Median 252 6 3381 3652 5.42 26.9 Standard 53.4 1.76 805 910 1.02
7.11 Deviation Standard 9.16 0.30 138 156 0.18 1.22 Error % CV 21.3
28.0 23.2 23.7 17.8 26.2
TABLE-US-00044 TABLE 16 Pseudoephedrine Pharmacokinetic Following
the Administration 120 mg Pseudoephedrine Hydrochloride and 1200 mg
Guaifenesin in an Experimental Formulation to Normal Volunteers
(Treatment B) AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max
(hr- (hr- life Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr)
(L/hr) Mean 263 5.11 3591 3884 5.22 26.7 Median 257 4.00 3507 3824
5.19 25.7 Standard 58.5 1.78 824 911 0.89 6.23 Deviation Standard
10.0 0.31 141 156 0.15 1.07 Error % CV 22.3 34.8 23.0 23.5 16.9
23.3
TABLE-US-00045 TABLE 17 Pseudoephedrine Pharmacokinetic Parameters
Following the Administration of 60 mg Pseudoephedrine Hydrochloride
and 600 mg Guaifenesin in an Experimental Formulation to Normal
Volunteers (Treatment C) AUC.sub.0-t AUC.sub.inf Half- C.sub.max
T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr) ng/mL)
ng/mL) (hr) (L/hr) Mean 141 4.94 1781 1968 5.57 26.5 Median 134
4.00 1696 1855 5.38 26.5 Standard 30.3 1.60 445 477 1.02 6.58
Deviation Standard 5.12 0.27 75.1 80.6 0.17 1.11 Error % CV 21.5
32.4 25.0 24.2 18.4 24.9
TABLE-US-00046 TABLE 18 Ratio of the Pseudoephedrine
Pharmacokinetic Parameters Following the Administration of 120 mg
Pseudoephedrine Hydrochloride and 1200 mg Guaifenesin as an
Experimental Formulation (Treatment B) Compared to that Following
the Administration of 120 mg Pseudoephedrine Hydrochloride as
Sudafed .RTM. 12 Hour and 120 mg Guaifenesin as Mucinex (Treatment
A) (%) AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr-
life Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean
107 85.2 105 103 92.1 101 Median 106 75.0 102 101 93.7 98.7
Standard 18.9 31.5 19.39 20.16 15.19 22.03 Deviation Standard 3.24
5.41 3.33 3.46 2.61 3.78 Error % CV 17.7 37.0 18.4 19.5 16.5
21.8
TABLE-US-00047 TABLE 19 Ratio of Pseudoephedrine Pharmacokinetic
Parameters Following the Administration of 60 mg Pseudoephedrine
Hydrochloride and 600 mg Guaifenesin as an Experimental Formulation
(Treatment C) Relative to that Following the Administration of 120
mg Pseudoephedrine Hydrochloride and 1200 mg Guaifenesin in an
Experimental Formulation (Treatment B) (%) AUC.sub.0-t AUC.sub.inf
Half- C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL)
(hr) ng/mL) ng/mL) (hr) (L/hr) Mean 53.5 99.5 49.1 50.5 108 102
Median 52.6 100 46.7 48.0 105 104 Standard 6.52 25.9 7.80 8.77 17.4
16.2 Deviation Standard 1.12 4.44 1.34 1.50 2.98 2.78 Error % CV
12.2 26.0 15.9 17.4 16.2 15.9
[0217] In conclusion, the experimental formulation containing 1200
mg guaifenesin and 120 mg pseudoephedrine hydrochloride is
bioequivalent to the reference formulations given is separate
doses. In addition the pharmacokinetics of guaifenesin and
pseudoephedrine are linear over the range studied.
Example 14
[0218] The effects of a high fat meal on the bioavailability of a
combination formulation were tested. The bioavailability of a 1200
mg guaifenesin and 120 mg Pseudoephedrine Hydrochloride formulation
volunteers was compared to reference drug bioavailability in an
open-label, single-dose, randomized, 2-way-crossover study using 36
subjects.
[0219] The subjects were randomized and placed into one of two
treatment groups. Group 1 received a 1200-mg controlled-release
guaifenesin product (Mucinex) and 120 mg pseudoephedrine
hydrochloride (Sudafed.RTM. 12 Hour) with 240 mL of water, 30
minutes after the beginning of the consumption of a high-fat
breakfast (Reference). Group 2 received an experimental formulation
containing 1200 mg guaifenesin and 120 mg pseudoephedrine
hydrochloride with 240 mL of water, 30 minutes after the beginning
of the consumption of a high-fat breakfast (Test)(PB01-M65A3).
[0220] Blood (10 mL, sodium heparin anticoagulant) was obtained at
the following times: Pre dose, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8,
10, 12, 14, 16 and 24 hours post dose (the total blood loss for
guaifenesin and pseudoephedrine analysis was 300 mL).
[0221] Subjects given 1200 mg of guaifenesin as Mucinex (Reference)
reached a C.sub.max of 2207 ng/mL in 1.85 hours and had an
AUC.sub.inf of 8067 hr-ng/mL. Subjects given 1200 mg guaifenesin as
an experimental formulation (Treatment B) reached a of 1649 ng/mL
(79% of that of the Reference) in 1.84 hour (118% of that of the
Reference) and had an AUC.sub.inf of 7663 hr-ng/mL (93% of that of
the Reference).
[0222] Subjects given 120 mg pseudoephedrine hydrochloride as
Sudafed.RTM. 12 Hour (Reference) reached a C.sub.max of 268 ng/mL
in 6.38 hours and had an AUC.sub.inf of 3636 hr-ng/mL. Subjects
given 120 mg pseudoephedrine hydrochloride as an experimental
formulation (Treatment B) reached a C.sub.max of 274 ng/mL (103% of
that of the Reference) in 4.80 hours (76.5% of that of the
Reference) and had an AUC.sub.inf of 3528 hr-ng/mL (96.5% of that
of the Reference).
[0223] Additionally, bioequivalence data was examined between the
Test group (Treatment B--1200 mg guaifenesin and 120 mg
pseudoephedrine hydrochloride as an experimental formulation) and
the Reference group (Treatment A--the reference 1200 mg guaifenesin
and 120 mg pseudoephedrine hydrochloride formulations).
[0224] The plasma concentrations of guaifenesin are depicted in
FIG. 23. The resulting pharmacokinetic data are shown in Tables 20
through 22. The maximum plasma concentrations of guaifenesin
following a 1200 mg oral dose as Mucinex were 2207.+-.952 ng/mL and
occurred in 1.85.+-.1.06 hours. The resulting area under the plasma
concentration vs. time curve (AUC.sub.inf was 8067.+-.2663
hr-ng/mL. The maximum plasma concentrations of guaifenesin
following a 1200-mg oral dose as an experimental formulation
(Treatment B) was 1649.+-.690 ng/mL (79%.+-.31.5% of the Reference
formulation) and occurred in 1.84.+-.0.818 hours (118%.+-.68.8% of
the Reference formulation). The resulting AUC.sub.inf was
7663.+-.2864 hr-ng/mL (93%.+-.17.6% of that of the Reference
formulation).
TABLE-US-00048 TABLE 20 guaifenesin Pharmacokinetic Parameters
Following the Administration of 1200 mg Guaifenesin as Mucinex
Along with 120 mg Pseudoephedrine Hydrochloride as Sudafed .RTM. 12
Hour to Normal Volunteers Following the Consumption of a High-Fat
Meal (Treatment A, Reference) AUC.sub.0-t AUC.sub.inf Half-
C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr)
ng/mL) ng/mL) (hr) (L/hr) Mean 2207 1.85 8049 8067 1.22 168 Median
2140 1.50 8160 8196 0.983 146 Standard 952 1.06 2666 2663 0.621
64.4 Deviation Standard 166 0.184 464 464 0.108 11.2 Error % CV
43.2 57.2 33.1 33.0 51.1 38.3
TABLE-US-00049 TABLE 21 Guaifenesin Pharmacokinetic Parameters
Following the Administration of 1200 mg Guaifenesin and 120 mg
Pseudoephedrine Hydrochloride in an Experimental Formulation to
Normal Volunteers Following the Consumption of a High-Fat Meal
(Treatment B, Test) AUC.sub.0-t AUC.sub.inf Half- C.sub.max
T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr) ng/mL)
ng/mL) (hr) (L/hr) Mean 1649 1.84 7611 7663 1.40 181 Median 1580
2.00 7474 7485 1.07 160 Standard 690 0.818 2816 2864 0.793 77.6
Deviation Standard 118 0.140 483 491 0.136 13.3 Error % CV 41.9
44.4 37.0 37.4 56.6 42.9
TABLE-US-00050 TABLE 22 Ratio of Guaifenesin Pharmacokinetic
Parameters Following the Administration of 1200 mg Guaifenesin and
120 mg Pseudoephedrine Hydrochloride in an Experimental Formulation
Compared to those of Treatment A (Reference) to Normal Volunteers
Following the Consumption of a High-Fat Meal (%) AUC.sub.0-t
AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life Clearance
Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 79 118 93 93
135 109.9 Median 73 100 91 91 99 109.8 Standard 31.5 68.8 17.5 17.6
97.1 16.8 Deviation Standard 5.57 12.2 3.09 3.12 17.2 2.96 Error %
CV 39.8 58.3 18.8 18.9 72.0 15.3
[0225] The plasma concentrations of pseudoephedrine are depicted in
FIG. 24. The resulting pharmacokinetic data are shown in Tables 23
through 25. The maximum plasma concentrations of pseudoephedrine
following a 120 mg oral dose as Sudafed.RTM. 12 Hour (Reference)
was 268.+-.69.7 ng/mL and occurred in 6.38.+-.1.26 hours. The
resulting AUC.sub.inf was 3636.+-.940 hr-ng/mL. The maximum plasma
concentrations of pseudoephedrine following a 120 mg oral dose as
an experimental formulation (Treatment B) was 274.+-.72.3 ng/mL
(103%.+-.10.3% of that of the Reference formulation) and occurred
in 4.80.+-.1.28 hours (76.5%.+-.23.1% of that of the Reference
formulation). The resulting AUC.sub.inf was 3528.+-.962 hr-ng/mL
(96.5%.+-.11.7% of that of the Reference formulation).
TABLE-US-00051 TABLE 23 Pseudoephedrine Pharmacokinetic Parameters
Following the Administration of 120 mg Pseudoephedrine
Hydrochloride as Sudafed .RTM. 12 Hour Along with 1200 mg
Guaifenesin as Mucinex to Normal Volunteers Following the
Consumption of a High-Fat Meal (Treatment A, Reference) AUC.sub.0-t
AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life Clearance
Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 268 6.38 3362
3636 5.28 28.8 Median 249 6.00 3238 3545 4.97 27.7 Standard 69.7
1.26 847 940 1.08 7.55 Deviation Standard 12.1 0.219 147 164 0.188
1.31 Error % CV 26.03 19.67 25.18 25.86 20.42 26.19
TABLE-US-00052 TABLE 24 Pseudoephedrine Pharmacokinetic Parameters
Following the Administration of 120 mg of Pseudoephedrine
Hydrochloride and 1200 mg Guaifenesin in an Experimental
Formulation to Normal Volunteers Following the Consumption of a
High-Fat Meal (Treatment B, Test) AUC.sub.0-t AUC.sub.inf Half-
C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr)
ng/mL) ng/mL) (hr) (L/hr) Mean 274 4.80 3273 3528 5.26 30.0 Median
268 4.00 3198 3448 5.31 28.5 Standard 72.3 1.28 876 962 1.02 8.48
Deviation Standard 12.2 0.216 148 163 0.172 1.43 Error % CV 26.4
26.6 26.8 27.3 19.4 28.3
TABLE-US-00053 TABLE 25 Ratio of Pseudoephedrine Pharmacokinetic
Parameters Following the Administration of 120 mg Pseudoephedrine
Hydrochloride and 1200 mg Guaifenesin in an Experimental
Formulation Compared to those of Treament A (Reference) to Normal
Volunteers Following the Consumptiono f a High-Fat Meal (%)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 103
76.5 96.5 96.5 101 105 Median 103 66.7 95.7 94.2 99.5 106 Standard
10.3 23.1 10.6 11.7 17.9 12.6 Deviation Standard 1.82 4.09 1.88
2.06 3.17 2.23 Error % CV 10.0 30.3 11.0 12.1 17.7 12.0
[0226] The rate of absorption of guaifenesin from the experimental
formulation, as assessed by C.sub.max is not bioequivalent to the
test formulation in the presence of a high fat meal with a 95%
confidence interval between 67.9% to 81.8%. The extent of
absorption of guaifenesin from the experimental tablet, as assessed
by AUC.sub.inf is equivalent to the test formulation in the
presence of a high fat meal.
[0227] In conclusion, the rate of guaifenesin absorption from the
experimental formulation is not bioequivalent to the Reference
formulations; whereas the extent of guaifenesin absorption is
bioequivalent to the Reference formulation in the presence of a
high-fat meal. The rate and extent of pseudoephedrine absorption
from the experimental formulation are bioequivalent to the
Reference formulation in the presence of a high-fat meal.
Example 15
[0228] A combination guaifenesin and Pseudoephedrine formulation
was tested for steady state pharmacokinetics as compared to
references in an open-label, multiple-dose, randomized,
2-way-crossover study using 36 subjects. The subjects were randomly
placed into one of two treatment groups. Group 1 received a 1200 mg
controlled-release guaifenesin product (Mucinex) plus a 120 mg
controlled-release pseudoephedrine product (Sudafed.RTM. 12 Hour)
with 240 mL of water after an overnight fast and again 12 hours
later for 11 doses (Reference). Group 2 received an experimental
controlled-release formulation comprising 1200 mg guaifenesin and
120 mg pseudoephedrine hydrochloride with 240 mL of water after an
overnight fast and again 12 hours later for 11 doses
(Test)(PB01-M65).
[0229] Blood (10 mL, sodium heparin anticoagulant) was obtained at
the following times: Pre dose blood sample before the AM dose on
Days 1, 4, 5 and 6. On Day 6 additional blood samples (5 mL, sodium
heparin anticoagulant) were also obtained at 0.5, 0.75, 1, 1.5, 2,
3, 4, 6, 8, 10, 12, 14, 16 and 24 hours after the last dose (total
blood loss for guaifenesin determination was 380 mL).
[0230] The subjects given 1200 mg guaifenesin, as Mucinex every 12
hours for 11 doses, reached a maximum steady-state plasma
guaifenesin concentration of 1960 ng/mL at 0.81 hours after the
last dose (120.81 hours after the first dose). The mean AUC.sub.ss
was 7209 hr-ng/mL and the mean C.sub.min was 52 ng/mL. Those
subjects given 1200 mg guaifenesin, as an experimental formulation
every 12 hours for 11 doses, reached a maximum steady-state plasma
guaifenesin concentration of 1983 ng/mL (103% of the Reference
formulation) at 0.96 hours after the last dose (120.96 hours after
the first dose, 100% of that of the Reference formulation). The
mean AUC.sub.ss was 8183 hr-ng/mL (114% of that of the Reference
formulation) and the mean C.sub.min was 117 ng/mL.
[0231] At steady state, the subjects given 120 mg pseudoephedrine
hydrochloride, as Sudafed.RTM. 12 Hour, every 12 hours for 11
doses, reached a steady-state maximum plasma pseudoephedrine
concentration of 361 ng/mL at 4.89 hours after the last dose
(124.89 hours after the first dose). The mean AUC.sub.ss was 3528
hr-ng/mL and the mean C.sub.min was 182 ng/mL. Those subjects, when
given the 120 mg pseudoephedrine hydrochloride as an experimental
formulation, reached a steady-state maximum plasma pseudoephedrine
concentration of 365 ng/mL (103% of that of the Reference) 4.10
hours after the last dose (124.10 hours after the first dose, 99.4%
of that of the Reference). The mean AUC.sub.ss was 3550 hr-ng/mL
(102% of that of the Reference) and the mean C.sub.min was 173
ng/mL.
[0232] The mean plasma concentrations of guaifenesin are depicted
in FIG. 25. The resulting pharmacokinetic data are shown in Tables
26 through 28. At steady state, the subjects given 1200 mg
guaifenesin every 12 hours, as Reference Mucinex for 11 doses,
reached a steady-state maximum plasma guaifenesin concentration of
1960.+-.859 ng/mL (Mean.+-.Standard Deviation) in 0.81
hours.+-.0.305 hour after the last dose (120.81 hours after the
first dose) and the steady-state AUC (AUC.sub.ss) was 7209.+-.3746
hr-ng/mL. At steady state, the subjects given 1200 mg guaifenesin
every 12 hours, as an experimental tablet formulation for 11 doses,
reached a steady-state maximum plasma guaifenesin concentration of
1983.+-.1019 ng/mL (103%.+-.29.6% of the Reference Mucinex) in 0.96
hours.+-.0.645 hour after the last dose (120.96 hours after the
first dose, 100%.+-.0.494%). The AUC.sub.ss was 8183.+-.5141
hr-ng/mL (114%.+-.27.0%).
TABLE-US-00054 TABLE 26 Guaifenesin Steady-State Pharmacokinetic
Parameters Following the Administration of 11 Doses of 1200 mg
guaifenesin as Mucinex and 120 mg Pseudoephedrine Hydrochloride as
Sudafed .RTM. 12 Hour to Normal Volunteers - Treatment A
(Reference) AUC.sub.SS C.sub.min C.sub.max T.sub.max C.sub.AVERAGE
Subject (hr-ng/mL) (ng/mL) (ng/mL) (hr) (ng/mL Mean 7209 52.0 1960
120.81 604 Median 6554 28.3 1850 120.75 547 Standard 3746 48.1 859
0.305 311 Deviation Standard 633 8.13 145 0.052 52.6 Error % CV
52.0 92.5 43.8 0.253 51.5
TABLE-US-00055 TABLE 27 guaifenesin Steady-State Pharmacokinetic
Parameters Following the Administration of 11 Doses of 1200 mg
guaifenesin and 120 mg Pseudoephedrine Hydrochloride in an
Experimental Formulation to Normal Volunteers - Treatment B (Test)
AUC.sub.SS C.sub.min C.sub.max T.sub.max C.sub.AVERAGE Subject
(hr-ng/mL) (ng/mL) (ng/mL) (hr) (ng/mL Mean 8183 117 1983 120.96
686 Median 6769 100 1750 120.75 564 Standard 5141 87.2 1019 0.645
431 Deviation Standard 869 14.7 172 0.109 72.8 Error % CV 62.8 74.5
51.4 0.533 62.7
TABLE-US-00056 TABLE 28 Ratio of Guaifenesin Steady-State
Pharmacokinetic Parameters Following the Administration of 11 Doses
of 1200 mg Guaifenesin and 120 mg Pseudoephedrine Hydrochloride in
an Experimental Formulation Compared to Reference Formulations to
Normal Volunteers (%) Subject AUC.sub.SS C.sub.min C.sub.max
T.sub.max C.sub.AVERAGE Mean 114 550 103 100 114 Median 116 261 104
100 113 Standard 27.0 712 29.6 0.494 26.4 Deviation Standard 4.57
120 5.01 0.084 4.46 Error % CV 23.7 129 28.6 0.494 23.2
[0233] The mean plasma concentration of Pseudoephedrine are shown
in FIG. 26. The resulting pharmacokinetic data are shown in Tables
29 through 31. At steady state, the subjects given 120 mg
pseudoephedrine hydrochloride, as Sudafed.RTM. 12 Hour, every 12
hours for 11 doses, reached a steady-state maximum plasma
pseudoephedrine concentration of 361.+-.77.7 ng/mL in 4.89
hours.+-.2.14 hour after the last dose (124.89 hours after the
first dose). The AUC.sub.ss was 3528.+-.862 hr-ng/mL. At steady
state, the subjects given 120 mg pseudoephedrine hydrochloride
every 12 hours, as an experimental tablet formulation for 11 doses,
reached a steady-state maximum plasma pseudoephedrine concentration
of 365.+-.83.3 ng/mL (103%.+-.2 1.4% of the Reference Sudafed
12-Hour) in 4.10 hours.+-.1.85 hours after the last dose (124.10
hours after the first dose, 99.4%.+-.2.09%). The AUC.sub.ss was
3550.+-.898 hr-ng/mL (102%.+-.19.6%).
TABLE-US-00057 TABLE 29 Pseudoephedrine Steady-State
Pharmacokinetic Parameters Following the Administration of 11 Doses
of 120 mg Pseudoephedrine Hydrochloride as Sudafed .RTM. 12 Hour
and 1200 mg Guaifenesin as Mucinex to Normal Volunteers - Treatment
A (Reference) AUC.sub.SS C.sub.min C.sub.max T.sub.max
C.sub.AVERAGE Subject (hr-ng/mL) (ng/mL) (ng/mL) (hr) (ng/mL Mean
3528 182 361 124.89 294 Median 3462 164 362 124.00 288 Standard 862
66.4 77.7 2.14 71.9 Deviation Standard 146 11.2 13.1 0.361 12.1
Error % CV 24.4 36.5 21.5 1.71 24.4
TABLE-US-00058 TABLE 30 Pseudoephedrine Steady-State
Pharmacokinetic Parameters Following the Administration of 11 Doses
of 120 mg Pseudoephedrine Hydrochloride and 1200 mg Guaifenesin in
an Experimental Formulation to Normal Volunteers - Treatment B
(Test) AUC.sub.SS C.sub.min C.sub.max T.sub.max C.sub.AVERAGE
Subject (hr-ng/mL) (ng/mL) (ng/mL) (hr) (ng/mL Mean 3550 173 365
124.10 296 Median 3399 170 350 124.00 283 Standard 898 55.2 83.3
1.85 74.8 Deviation Standard 152 9.34 14.1 0.313 12.7 Error % CV
25.3 32.0 22.8 1.49 25.3
TABLE-US-00059 TABLE 31 Ratio of Pseudoephedrine Steady-State
Pharmacokinetic Parameters Following the Administration of 11 Doses
of 120 mg Pseudoephedrine Hydrochloride and 1200 mg Gaifenesin in
an Experimental Formulation Compared to Reference Formulations to
Normal Volunteers (%) Subject AUC.sub.SS C.sub.min C.sub.max
T.sub.max C.sub.AVERAGE Mean 102 100 103 99.4 102 Median 99.6 102
100 99.2 100 Standard 19.6 28.0 21.4 2.09 19.6 Deviation Standard
3.31 4.73 3.62 0.354 3.31 Error % CV 19.1 27.9 20.8 2.11 19.1
[0234] In conclusion, the experimental tablet formulation was
bioequivalent to the Reference formulations at steady state. The
experimental formulation is bioequivalent to the Reference
formulations in terms of both C.sub.max and AUC.sub.ss for
guaifenesin and pseudoephedrine hydrochloride.
Example 16
[0235] In another study drug interaction potential for combination
drugs was examined. The interaction potential for 1200 mg
guaifenesin and 120 mg Pseudoephedrine Hydrochloride was compared
to reference in an open label, single dose, randomized, 3-way
crossover study using 36 subjects.
[0236] The subjects were randomized and placed into one of three
treatment groups. roup A received a 1200 mg controlled release
guaifenesin product (Mucinex) with 240 mL of room-temperature water
after an overnight fast. Group B received a 120 mg controlled
release pseudoephedrine product (Sudafed.RTM. 12 Hour) with 240 mL
of room-temperature water after an overnight fast. Group C received
a 1200 mg guaifenesin product (Mucinex) and 120 mg pseudoephedrine
hydrochloride (Sudafed.RTM. 12 Hour) with 240 mL of
room-temperature water after an overnight fast.
[0237] Blood (10 mL, sodium heparin anticoagulant) was obtained at
the following times: Pre dose, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8,
10, 12, 14, 16 and 24 hours post dose (the total blood loss for
guaifenesin and pseudoephedrine analysis was-450 mL).
[0238] Subjects given 1200 mg of guaifenesin as Mucinex (Treatment
A, Reference) reached a C.sub.max of 2009 ng/mL in 0.89 hours and
had an AUC.sub.inf of 8138 hr-ng/mL. Subjects given 1200 mg
guaifenesin as Mucinex along with 120 mg Pseudoephedrine
hydrochloride as Sudafed.RTM. 12 Hour (Treatment C, Test) reached a
C.sub.max of 1989 ng/mL (102% of that of the reference) in 0.84
hour (104% of that of the reference) and had an AUC.sub.inf of 8052
hr-ng/mL (100% of that of the reference).
[0239] Subjects given 120 mg pseudoephedrine hydrochloride as
Sudafed.RTM. 12 Hour (Treatment B, Reference) reached a C.sub.max
of 296 ng/mL in 6 hours and had an AUC.sub.inf of 4505 hr ng/mL.
Subjects given 120 mg pseudoephedrine hydrochloride as Sudafed.RTM.
12 Hour, along with 1200 mg guaifenesin as Mucinex (Treatment C,
Test) reached a C of 289 ng/mL (98% of that of the reference) in 6
hours (101% of that of the reference) and had an AUC.sub.inf of
4396 hr-ng/mL (98% of that of the reference).
[0240] The plasma concentrations of guaifenesin are depicted in
FIG. 27. The resulting pharmacokinetic data is shown in Tables 38
through 41. The maximum plasma concentrations of guaifenesin
following a 1200 mg oral dose as Mucinex (Treatment A, Reference)
were 2009.+-.819.2 ng/mL and occurred in 0.89.+-.0.42 hours. The
resulting area under the plasma concentration vs. time curve
(AUC.sub.inf was 8138.+-.3253 hr-ng/mL. The maximum plasma
concentrations of guaifenesin following a 1200 mg oral dose as
Mucinex along with 120 mg pseudoephedrine hydrochloride (Treatment
C, Test) were 1989.+-.863 ng/mL (102.33%.+-.31.40% of that of the
reference formulation) and occurred in 0.84.+-.0.31 hours
(103.94%.+-.35.38% that of the reference formulation). The
resulting AUC.sub.inf was 8052.+-.3344 hr-ng/mL (100.06%.+-.18.09%
of that of the reference formulation).
TABLE-US-00060 TABLE 38 Gaifenesin Pharmacokinetic Parameters
Following the Administration of 1200 mg Gaifenesin to Normal
Volunteers (Treatment A) AUC.sub.0-t AUC.sub.inf Half- C.sub.max
T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr) ng/mL)
ng/mL) (hr) (L/hr) Mean 2009 0.89 7921 8138 4.00 172.13 Median 1695
0.75 7063.8 7284.17 2.82 164.87 Standard 819.22 0.42 3196.53
3253.39 5.58 70.19 Deviation Standard 138.47 0.07 540.31 549.92
0.94 11.87 Error % CV 40.77 46.79 40.35 39.98 139.48 40.78
TABLE-US-00061 TABLE 39 Gaifenesin Pharmacokinetic Parameters
Following the Administration of 1200 mg Gaifenesin Along with 120
mg Pseudoephedrine Hydrochloride to Normal Volunteers (Treatment C)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 1989
0.84 7923 8052 3.41 175.45 Median 1770 0.75 6689 6745 3.33 177.93
Standard 863.36 0.31 3337 3344 1.72 71.07 Deviation Standard 145.93
0.05 564.04 565.25 0.29 12.01 Error % CV 43.41 36.37 42.12 41.53
50.56 40.51
TABLE-US-00062 TABLE 40 Ratio of Gaifenesin Pharmacokinetic
Parameters Following the Administration of 1200 mg Gaifenesin Along
with 120 mg Pseudoephedrine Hydrochloride Compared to 1200 mg
Gaifenesin Alone to Normal Volunteers (%) AUC.sub.0-t AUC.sub.inf
Half- C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL)
(hr) ng/mL) ng/mL) (hr) (L/hr) Mean 102.33 103.94 100.87 100.06
128.38 103.47 Median 95.79 100 103.14 101.71 107.41 98.32 Standard
31.40 35.38 18.01 18.09 79.38 20.60 Deviation Standard 5.31 5.98
3.05 3.06 13.42 3.48 Error % CV 30.69 34.04 17.86 18.08 61.83
19.91
TABLE-US-00063 TABLE 41 Psuedoephedrine Pharmacokinetic Parameters
Following the Administration of 120 mg Pseudoephedrine
Hydrochloride to Normal Volunteers (Treatment B) AUC.sub.0-t
AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life Clearance
Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 295.8 6.17 4024
4505 6.05 23.66 Median 297.5 6 3823 4430 5.81 22.20 Standard 73.25
1.92 1047 1250 1.44 7.24 Deviation Standard 12.38 0.32 177 211 0.24
1.22 Error % CV 24.76 31.13 26.02 27.75 23.83 30.60
[0241] The plasma concentrations of pseudoephedrine are depicted in
FIG. 28. The resulting pharmacokinetic data is shown in Tables 42
through 43. The maximum plasma concentrations of pseudoephedrine
following a 120 mg oral dose as Sudafed.RTM. 12 Hour (Treatment B,
Reference) were 295.8.+-.73.25 ng/mL and occurred in 6.17.+-.1.92
hours. The resulting AUC.sub.inf was 4505.+-.1250 hr-ng/mL. The
maximum plasma concentrations of pseudoephedrine following a 120 mg
oral dose as Sudafed.RTM. 12 Hour along with 1200 mg guaifenesin as
Mucinex (Treatment C, Test) were 289.3.+-.77.61 ng/mL
(98.41%.+-.12.77% of that of the reference formulation) and
occurred in 5.75.+-.1.54 hours (100.74%.+-.38.65% of that of the
reference formulation). The resulting AUC.sub.inf was 4396.+-.1347
hr-ng/mL (98.40%.+-.15.24% of that of the reference
formulation).
TABLE-US-00064 TABLE 42 Pseudoephedrine Pharmacokinetic Following
the Administration of 120 mg Pseudoephedrine Hydrochloride Along
with 1200 mg guaifenesin to Normal Volunteers (Treatment C)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean
289.33 5.75 3925 4396 6.04 24.30 Median 286 6 3932 4247 5.63 23.16
Standard 77.61 1.54 1089 1347 1.38 6.95 Deviation Standard 13.12
0.26 184 228 0.23 1.17 Error % CV 26.82 26.74 27.75 30.65 22.79
28.60
TABLE-US-00065 TABLE 43 Ratio of Pseudoephedrine Pharmacokinetic
Parameters Following the Administration of 120 mg Along with 1200
mg Gaifenesin Hydrochloride Compared to 120 mg Pseudoephedrine
Alone to Normal Volunteers (%) AUC.sub.0-t AUC.sub.inf Half-
C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr)
ng/mL) ng/mL) (hr) (L/hr) Mean 98.41 100.74 98.22 98.40 103.30
103.99 Median 98.40 100 96.90 97.91 97.46 102.14 Standard 12.77
38.65 13.15 15.24 30.44 15.96 Deviation Standard 2.16 6.53 2.22
2.58 5.14 2.70 Error % CV 12.97 38.36 13.39 15.49 29.47 15.35
[0242] In conclusion, the pharmacokinetics of guaifenesin and
pseudoephedrine hydrochloride are unaffected by the presence or
absence of one another.
Example 17
[0243] In another experiment the effect of a high-fat on the
bioavailability of an of the combination of 1200 mg guaifenesin and
120 mg Pseudoephedrine Hydrochloride in normal healthy volunteers
was again compared to reference drug in an open-label, single-dose,
randomized, 2-way-crossover study using 36 subjects.
[0244] The subjects were randomized and placed into one of two
treatment groups. Each treatment group was fasted overnight.
Treatment A received an experimental formulation containing 1200 mg
guaifenesin and 120 mg pseudoephedrine hydrochloride with 240 mL of
water (Reference). Treatment B received an experimental
controlled-release formulation containing 1200 mg guaifenesin and
120 mg pseudoephedrine hydrochloride with 240 mL of water, 30
minutes after the beginning of the consumption of a high-fat
breakfast (Test).
[0245] Blood (10 mL, sodium heparin anticoagulant) was obtained at
the following times: Pre dose, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8,
10, 12, 14, 16 and 24 hours post dose (the total blood loss for
guaifenesin and pseudoephedrine analysis was 300 mL). Subjects
given 1200 mg of guaifenesin and 120 mg pseudoephedrine
hydrochloride as an experimental formulation following an overnight
fast (Treatment A, Reference) reached a plasma guaifenesin
C.sub.max of 1857 ng/mL in 1.06 hours and had an AUC.sub.inf of
8142 hr-ng/mL. Subjects given 1200 mg guaifenesin and 120 mg
pseudoephedrine hydrochloride as an experimental formulation after
the consumption of a high-fat meal (Treatment B, Test) reached a
plasma guaifenesin C.sub.max of 1364 ng/mL (79.3% of that of the
Reference) in 2.06 hour (238% of that of the Reference) and had an
AUC.sub.inf of 7469 hr-ng/mL (94.1% of that of the Reference).
[0246] Subjects given 120 mg pseudoephedrine hydrochloride as an
experimental formulation after an overnight fast (Treatment A,
Reference) reached a plasma pseudoephedrine C.sub.max of 283 ng/mL
in 4.6 hours and had an AUC.sub.inf of 3746 hr-ng/mL. Subjects
given 120 mg pseudoephedrine hydrochloride as an experimental
formulation following the consumption of a high-fat meal (Treatment
B, Test) reached a plasma pseudoephedrine C.sub.max of 301 ng/mL
(108% of that of the Reference) in 5.77 hours (137% of that of the
Reference) and had an AUC.sub.inf of 3660 hr-ng/mL (99% of that of
the Reference).
[0247] The plasma concentrations of guaifenesin are depicted in
FIG. 29. The resulting pharmacokinetic data are shown in Tables 44
through 46. The maximum plasma concentrations of guaifenesin
following 1200 mg guaifenesin and 120 mg pseudoephedrine
hydrochloride after an overnight fast were 1857.+-.838 ng/mL
(Mean.+-.Standard Deviation) and occurred in 1.06.+-.0.582 hours.
The resulting area under the plasma concentration vs. time curve
(AUC.sub.inf was 8142.+-.3500 hr-ng/mL. The maximum plasma
concentrations of guaifenesin, following 1200 mg oral guaifenesin
and 120 mg pseudoephedrine hydrochloride as an experimental
formulation following the consumption of a high-fat meal (Treatment
B, Test), were 1364.+-.691 ng/mL (79.3%.+-.34.7% of that of the
Reference formulation) and occurred in 2.06.+-.1.16 hours (23
8%.+-.157% that of the Reference formulation). The resulting
AUC.sub.inf was 7469.+-.3217 hr-ng/mL (94.1%.+-.23.1% of that of
the Reference formulation).
TABLE-US-00066 TABLE 44 Gaifenesin Pharmacokinetic Parameters
Following the Administration of 1200 mg Gaifenesin and 120 mg
Pseudoephedrine Hydrochloride in an Experimental Formulation to
Normal Volunteers After an Overnight Fast (Treatment A, Reference)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 1857
1.06 8091 8142 1.82 18.0 Median 1830 0.750 8228 8244 1.68 14.6
Standard 838 0.582 3501 3500 0.702 8.46 Deviation Standard 144
0.100 600 600 0.120 1.45 Error % CV 45 55.0 43.3 43.0 38.6 47.0
TABLE-US-00067 TABLE 45 Gaifenesin Pharmacokinetic Parameters
Following the Administration of 1200 mg Gaifenesin and 120 mg
Pseudoephedrine Hydrochloride in an Experimental Formulation to
Normal Volunteers After the Consumption of a High-Fat Meal
(Treatment B, Test) AUC.sub.0-t AUC.sub.inf Half- C.sub.max
T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr) ng/mL)
ng/mL) (hr) (L/hr) Mean 1364 2.06 7403 7469 1.39 18.9 Median 1190
2.00 6842 6857 1.12 17.5 Standard 691 1.16 3185 3217 0.833 7.80
Deviation Standard 119 0.200 546 552 0.143 1.34 Error % CV 50.7
56.6 43.0 43.1 60.0 41.2
TABLE-US-00068 TABLE 46 Ratio of Gaifenesin Pharmacokinetic
Parameters Following the Administration of 1200 mg Gaifenesin and
120 mg Pseudoephedrine Hydrochloride in an Experimental Formulation
Following the Consumption of a High-Fat Meal (Treatment B, Test)
Compared to that After an Overnight Fast (Treatment A, Reference)
to Normal Volunteers (%) AUC.sub.0-t AUC.sub.inf Half- C.sub.max
T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr) ng/mL)
ng/mL) (hr) (L/hr) Mean 79.3 238 94.0 94.1 87.2 112 Median 71.4 200
89.7 89.6 68.1 112 Standard 34.7 157 23.4 23.1 53.2 24.5 Deviation
Standard 6.04 27.4 4.07 4.02 9.27 4.26 Error % CV 43.8 66.1 24.8
24.6 61.1 21.9
[0248] The resulting pharmacokinetic data are shown in Tables 47
through 49. The maximum plasma concentrations of pseudoephedrine
following a 120 mg pseudoephedrine hydrochloride and 1200 mg
guaifenesin, in an experimental formulation after an overnight fast
(Treatment A, Reference), were 283.+-.79.6 ng/mL and occurred in
4.60.+-.1.56 hours. The resulting AUC.sub.inf was 3746.+-.997
hr-ng/mL. The maximum plasma concentrations of pseudoephedrine
following 120 mg pseudoephedrine hydrochloride and 1200 mg
guaifenesin, in an experimental formulation following the
consumption of a high-fat meal (Treatment B, Test), were
301.+-.80.4 ng/mL (108%.+-.18.5% of that of the Reference
formulation) and occurred in 5.77.+-.1.78 hours (137%.+-.61.9% of
that of the Reference formulation). The resulting AUC.sub.inf was
3660.+-.963 hr-ng/mL (99.0%.+-.20.1% of that of the Reference
formulation).
TABLE-US-00069 TABLE 47 Pseudoephedrine Pharmacokinetic Parameters
Following the Administration of 120 mg of Pseudoephedrine
Hydrochloride and 1200 Gaifenesin in an Experimental Formulation to
Normal Volunteers After an Overnight Fast (Treatment A, Reference)
AUC.sub.0-t AUC.sub.inf Half- C.sub.max T.sub.max (hr- (hr- life
Clearance Subject (ng/mL) (hr) ng/mL) ng/mL) (hr) (L/hr) Mean 283
4.60 3477 3746 5.01 28.2 Median 266 4.00 3374 3552 4.94 27.7
Standard 79.6 1.56 884 997 1.06 8.03 Deviation Standard 13.7 0.267
152 171 0.182 1.38 Error % CV 28.2 33.8 25.4 26.6 21.2 28.5
TABLE-US-00070 TABLE 48 Pseudoephedrine Pharmacokinetic Parameters
Following the Administration of 120 mg of Pseudoephedrine
Hydrochloride and 1200 mg guaifenesin in an Experimental
Formulation to Normal Volunteers After Consumption of a High-Fat
Meal (Treatment B, Test) AUC.sub.0-t AUC.sub.inf Half- C.sub.max
T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr) ng/mL)
ng/mL) (hr) (L/hr) Mean 301 5.77 3403 3660 4.64 28.8 Median 292
6.00 3152 3455 4.45 28.5 Standard 80.4 1.78 915 963 1.05 7.91
Deviation Standard 13.8 0.306 157 165 0.180 1.36 Error % CV 26.7
30.9 26.9 26.3 22.6 27.5
TABLE-US-00071 TABLE 49 Ratio of Pseudoephedrine Pharmacokinetic
Parameters Following the Administration of 120 mg Pseudoephedrine
Hydrochloride and 1200 mg guaifenesin in an Experimental
Formulation After the Consumption of a High-Fat Meal (Treatment B,
Test) Compared to that After an Overnight Fast (Treatment A,
Reference) to Normal Volunteers (%) AUC.sub.0-t AUC.sub.inf Half-
C.sub.max T.sub.max (hr- (hr- life Clearance Subject (ng/mL) (hr)
ng/mL) ng/mL) (hr) (L/hr) Mean 108 137 98.9 99.0 93.7 105 Median
109 133 96.9 95.9 88.4 104 Standard 18.5 61.9 20.8 20.1 17.1 20.2
Deviation Standard 3.22 10.8 3.62 3.50 2.97 3.52 Error % CV 17.1
45.2 21.0 20.3 18.2 19.3
[0249] The rate of absorption of guaifenesin from the experimental
formulation, as assessed by C.sub.max is not bioequivalent to the
Test formulation in the presence of a high-fat meal. The extent of
absorption of guaifenesin from the experimental tablet, as assessed
by AUC.sub.inf, is equivalent to the Test formulation in the
presence of a high-fat meal.
[0250] The rate and extent of pseudoephedrine absorption from the
experimental formulation was bioequivalent to the Reference
formulation in the presence of a high-fat meal.
[0251] In conclusion, the rate of guaifenesin absorption from the
experimental formulation is not bioequivalent to the Reference
formulation; whereas the extent of guaifenesin absorption is
bioequivalent to the Reference formulation in the presence of a
high-fat meal. The rate and extent of pseudoephedrine absorption
from the experimental formulation are bioequivalent to the
Reference formulation in the presence of a high-fat meal.
[0252] Other embodiments and uses of the invention will be apparent
to those of skill in the art from consideration of the
specification and practice of the invention disclosed herein. The
specification and examples should be considered exemplary only with
the true scope and spirit of the invention indicated by the
following claims. As will be easily understood by those of skill in
the art, variations and modifications of each of the disclosed
embodiments can be easily made within the scope of this invention
as defined by the following claims.
* * * * *
References