U.S. patent application number 12/840471 was filed with the patent office on 2011-01-27 for tamper-resistant dosage form for oxidation-sensitive opioids.
This patent application is currently assigned to Grunenthal GmbH. Invention is credited to Johannes BARTHOLOMAUS, Ulrike Bertram, Anja Gei ler, Kornelia Grie mann.
Application Number | 20110020451 12/840471 |
Document ID | / |
Family ID | 41263602 |
Filed Date | 2011-01-27 |
United States Patent
Application |
20110020451 |
Kind Code |
A1 |
BARTHOLOMAUS; Johannes ; et
al. |
January 27, 2011 |
TAMPER-RESISTANT DOSAGE FORM FOR OXIDATION-SENSITIVE OPIOIDS
Abstract
Thermoformed pharmaceutical dosage form having a breaking
strength of at least 300 N, comprising an opioid (A), a free
physiologically acceptable acid (B) in an amount of from 0.001 to
5.0 wt.-%, based on the total weight of the pharmaceutical dosage
form, and a polyalkylene oxide (C) having a weight average
molecular weight M.sub.w of at least 200,000 g/mol.
Inventors: |
BARTHOLOMAUS; Johannes;
(Aachen, DE) ; Gei ler; Anja; (Stolberg, DE)
; Bertram; Ulrike; (Aachen, DE) ; Grie mann;
Kornelia; (Aachen, DE) |
Correspondence
Address: |
GERSTENZANG, WILLIAM C.;NORRIS MCLAUGHLIN & MARCUS, PA
875 THIRD AVE, 8TH FLOOR
NEW YORK
NY
10022
US
|
Assignee: |
Grunenthal GmbH
Aachen
DE
|
Family ID: |
41263602 |
Appl. No.: |
12/840471 |
Filed: |
July 21, 2010 |
Current U.S.
Class: |
424/486 ;
514/282 |
Current CPC
Class: |
A61K 9/2013 20130101;
A61K 9/20 20130101; A61K 9/2095 20130101; A61K 31/485 20130101;
A61P 25/30 20180101; A61K 9/2031 20130101; A61K 9/2054 20130101;
A61P 25/04 20180101; A61K 9/284 20130101 |
Class at
Publication: |
424/486 ;
514/282 |
International
Class: |
A61K 31/485 20060101
A61K031/485; A61K 9/10 20060101 A61K009/10; A61P 25/30 20060101
A61P025/30 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 22, 2009 |
EP |
09 009 480.6 |
Claims
1. A thermoformed pharmaceutical dosage form having a breaking
strength of at least 300 N and comprising an opioid (A), a free
physiologically acceptable acid (B) in an amount of from 0.001 to
5.0 wt.-%, based on the total weight of the pharmaceutical dosage
form, and a polyalkylene oxide (C) having a weight average
molecular weight M.sub.w of at least 200,000 g/mol.
2. The pharmaceutical dosage form according to claim 1, wherein the
acid (B) is a multicarboxylic acid.
3. The pharmaceutical dosage form according to claim 2, wherein the
multicarboxylic acid is selected from the group consisting of
maleic acid, fumaric acid, glutaric acid, malonic acid and citric
acid.
4. The pharmaceutical dosage form according to claim 1, wherein the
content of the acid (B) is within the range of from 0.005 to 2.5
wt.-%, based on the total weight of the pharmaceutical dosage
form.
5. The pharmaceutical dosage form according to claim 1, which
comprises a polyalkylene glycol, wherein the relative weight ratio
of the polyalkylene oxide to the polyalkylene glycol is within the
range of 4.2.+-.2:1.
6. The pharmaceutical dosage form according to claim 1, which
comprises an antioxidant.
7. The pharmaceutical dosage form according to claim 6, wherein the
antioxidant is .alpha.-tocopherol.
8. The pharmaceutical dosage form according to claim 6, wherein the
content of the antioxidant is within the range of from 0.001 to 5.0
wt.-%, based on the total weight of the pharmaceutical dosage
form.
9. The pharmaceutical dosage form according to claim 1, wherein
after storage for 4 weeks at 40.degree. C. and 75% rel. humidity,
the content of opioid (A) amounts to at least 98.0% of its original
content before storage.
10. The pharmaceutical dosage form according to claim 1, wherein
the opioid (A) is embedded in a matrix comprising the polyalkylene
oxide (C), said matrix controlling the release of the opioid from
the pharmaceutical dosage form.
11. The pharmaceutical dosage form according to claim 1, wherein
the opioid (A) is selected from the group consisting of
oxymorphone, oxycodone, hydromorphone, and the physiologically
acceptable salts thereof.
12. The pharmaceutical dosage form according to claim 1, wherein
the relative weight ratio of the polyalkylene oxide (C) and the
opioid (A) is at least 1:1.
13. The pharmaceutical dosage form according to claim 1, which is
adapted for administration once daily or twice daily.
14. The pharmaceutical dosage form according to claim 1, which has
a breaking strength of at least 500 N.
15. A packaging containing the pharmaceutical dosage form of claim
1 and an oxygen scavenger.
16. The pharmaceutical dosage form according to claim 7, wherein
the content of the antioxidant is within the range of from 0.001 to
5.0 wt.-%, based on the total weight of the pharmaceutical dosage
form.
Description
[0001] The invention relates to a pharmaceutical dosage form which
contains an opioid with improved storage stability.
[0002] Many pharmacologically active compounds have a potential of
being abused and thus, are advantageously provided in form of
tamper resistant pharmaceutical dosage forms. Prominent examples of
such pharmacologically active compounds are opioids.
[0003] It is known that abusers crush conventional tablets, which
contain opioids, to defeat the time-release "micro-encapsulation"
and then ingest the resulting powder orally, intra-nasally,
rectally, or by injection.
[0004] Various concepts for the avoidance of drug abuse have been
developed. One concept relies on the mechanical properties of the
pharmaceutical dosage forms, particularly an increased breaking
strength (resistance to crushing). The major advantage of such
pharmaceutical dosage forms is that comminuting, particularly
pulverization, by conventional means, such as grinding in a mortar
or fracturing by means of a hammer, is impossible or at least
substantially impeded.
[0005] Such pharmaceutical dosage forms are useful for avoiding
drug abuse of the pharmacologically active compound contained
therein, as they may not be powdered by conventional means and
thus, cannot be administered in powdered from, e.g. nasally. The
mechanical properties, particularly the high breaking strength of
these pharmaceutical dosage forms renders them tamper resistant. In
the context of such tamper resistant pharmaceutical dosage forms it
can be referred to, e.g., WO 2005/016313, WO 2005/016314, WO
2005/063214, WO 2005/102286, WO 2006/002883, WO 2006/002884, WO
2006/002886, WO 2006/082097, WO 2006/082099, and WO
2008/107149.
[0006] A problem in the manufacture of pharmaceutical dosage forms
that contain opioids, such as oxymorphone, hydromorphone, and
oxycodone, is their sensitivity towards oxidative degradation and
decomposition. Oxidation may be caused by molecular oxygen or by
radicals or peroxides generated by compounds that come into close
proximity with these oxidation-sensitive opioids. Pharmaceutical
excipients as such, e.g. polyethylene glycols, may cause or
catalyze oxidative degradation, for example in the course of the
process for the manufacture the pharmaceutical dosage forms.
Further, molecular oxygen may generate said radicals or
peroxides.
[0007] Typically, decomposition is monitored in standard storage
stability tests e.g. under accelerated storage conditions, such as
40.degree. C./75% rel. humidity. Under these conditions,
degradation and decomposition proceeds faster than under ambient
conditions. The drug approving authorities, such as CHMP and FDA,
and international harmonization unions, such as ICH, have set
standard storage stability thresholds which have to be met in order
to get a pharmaceutical dosage form approved.
[0008] Particular problems arise when the oxidation-sensitive
opioid needs to be exposed to elevated temperatures in the course
of the manufacturing process, such as hot-melt extrusion, film
coating and the like. Under these conditions the opioids are even
more sensitive towards oxidation. For example, several known
processes for the manufacture of pharmaceutical dosage forms having
an increased breaking strength require that a pharmaceutical
composition containing the active ingredient is subjected to a
specific amount of pressure at a specific elevated temperature for
a specific period of time. Depending on the constituents of the
pharmaceutical composition and their amounts, temperature, pressure
and time may be varied within certain limits. However, if the
minimal requirements are not satisfied, the breaking strength of
the resultant pharmaceutical dosage form is too low.
[0009] In consequence, some conventional processes for the
manufacture of pharmaceutical dosage forms, particularly for
pharmaceutical dosage forms having an increased breaking strength,
require comparatively harsh process conditions and thus, are so far
not applicable for oxidation-sensitive opioids. In particular,
chain rupture of pharmaceutical excipients such as polyethylene
oxide during hot melt extrusion risks the formation of free
radicals thereby further increasing the oxidative stress.
[0010] Lower dosages of oxidation-sensitive opioids often show a
higher percentage of oxidative degradation and decomposition than
higher dosages. Thus, as far as storage stability is concerned,
pharmaceutical dosage forms containing lower dosages of
oxidation-sensitive opioids need particular attention.
[0011] The effect of oxidation mechanisms and chemical interactions
on stability of polymeric systems for amorphous
A.sup.9-tetrahydrocannabinol (a non-opioid) produced by a hot-melt
method is described in M. Munjal et al., J. Pharm. Sciences,
95(11), 2006, 2473-85. The study demonstrated for this highly
unstable drug a complex nature of interactions including
drug-excipient compatibility, use of antioxidants, cross-linking in
polymeric matrixes, micro environment pH, and moisture effect.
[0012] K. C. Waterman et al., Pharm. Develop. Tech. 7(1), 2002,
1-32 reviews the stabilization of pharmaceuticals to oxidative
degradation. Various methods for reducing oxidation are
recommended. The authors conclude that in the end, every drug
presents a unique situation.
[0013] WO 2008/107149 discloses oral dosage forms having an
increased breaking strength that may contain redox stabilizers such
as complexing agents, e.g. EDTA.
[0014] WO 2008/086804 relates to controlled release compositions
containing a matrix composition comprising a) polymer or a mixture
of polymers, b) an active drug substance and optionally c) one or
more pharmaceutically acceptable excipients that is without alcohol
induced dose dumping and have excellent properties with respect to
avoiding drug abuse. Preferably, the composition is resistant to
isolate and/or dissolve the active drug substance from the
composition by crushing, melting and/or ethanol extraction, whereby
the composition is resistant to drug abuse. Citric acid may be
present as flavouring agent. Example 2 relates to a composition
containing 7 wt.-% of citric acid.
[0015] WO 2008/148798 discloses an layered extended release
composition for prolonged effect and a way to ensure prolonged
effect e.g. once daily administration is to ensure optimal
absorption of the active substance though the gastrointestinal
tract i.e. from the stomach to rectum.
[0016] There is no general concept to successfully suppress
oxidative degradation of oxidation-sensitive drugs in
pharmaceutical dosage forms. The complex individual oxidation
mechanisms that are relevant for a particular drug as well as the
plurality of possible factors that have an influence on oxidation
processes require extensive investigations in each particular case
taking into account the particular circumstances.
[0017] It is further known that the other ingredients of the
pharmaceutical dosage forms may show stability problems when being
exposed to such harsh process conditions. For example, high
molecular weight polyethylene oxide tends to degrade upon hot-melt
extrusion. Polymer degradation, however, may result in an
uncontrolled release profile, particularly when the active
ingredient is embedded in a matrix of the polyethylene oxide, and
this might be another cause for oxidative degradation of the active
ingredient by radicals. When adding suitable excipients in order to
stabilize the high molecular weight polyethylene oxide, such as
.alpha.-tocopherol, it should be taken into considerations that
said excipients in turn may have a detrimental effect on the
stability of other ingredients of the pharmaceutical dosage, e.g.
of the pharmacologically active compound.
[0018] It is an object of the present invention to provide
tamper-resistant pharmaceutical dosage forms containing opioids,
particularly oxidation-sensitive opioids, that have advantages over
the pharmaceutical dosage forms of the prior art. The
pharmaceutical dosage forms should have improved storage stability,
so that they may contain oxidation-sensitive opioids even at
comparatively low doses. Further, it should be possible to prepare
the pharmaceutical dosage forms by conventional processes under
conventional conditions such as elevated temperature and pressure
(e.g. in the course of thermoforming by hot-melt extrusion).
[0019] This object has been solved by the subject-matter of the
patent claims.
[0020] The invention relates to a thermoformed pharmaceutical
dosage form having a breaking strength of at least 300 N and
comprising [0021] an opioid (A), [0022] a free physiologically
acceptable acid (B) in an amount of from 0.001 to 5.0 wt.-%, based
on the total weight of the pharmaceutical dosage form, and [0023] a
polyalkylene oxide (C) having a weight average molecular weight
M.sub.w of at least 200,000 g/mol.
[0024] It has been surprisingly found that certain morphinan
derivatives such as oxymorphone are oxidatively degraded to
N-oxides (e.g., oxymorphone-N-oxide, N-oxides in general are often
said to be toxic and possibly cancerogenic) upon manufacture and
storage of the corresponding dosage forms and that the formation of
said N-oxides and other decomposition products can be suppressed by
the presence of suitable amounts of acid (B) in the pharmaceutical
dosage forms according to the invention.
[0025] While it is not intended to be bound to any theory, the
stabilizing effect of acid (B) might correlate with the
pK.sub.A-value of the oxidation-sensitive opioids. The
pK.sub.A-value of oxymorphone is 8.3. Conventional formulations of
oxymorphone, which are tamper resistant due to their increased
breaking strength but which do not show the desired shelf life,
give a pH value of about 7.5 when being dispersed in water. Under
these conditions, a considerable amount of the oxymorphone is
present as a free base (i.e., is not protonated), which might be
more sensitive towards oxidation than the (protonated) salt form.
This concept is further supported by the fact that in the absence
of acid (B), the dosage forms tend to have a yellowish, beige
color, while the presence of acid (B) leads to whiter, e.g.
colorless tablets. Thus, the presence of acid (B) might decrease
the pH value within the dosage form thereby improving drug
resistance towards oxidative degradation.
[0026] It has been surprisingly found that pharmaceutical
excipients which are conventionally used in order to improve drug
resistance towards oxidative degradation, particularly certain
anti-oxidants, e.g., .alpha.-tocopherol, can be contra-productive
and rather deteriorate than improve drug resistance towards
oxidative degradation.
[0027] The pharmaceutical dosage form according to the invention is
thermoformed, preferably by extrusion, although also other methods
of thermoforming may be used in order to manufacture the
pharmaceutical dosage form according to the invention such as
press-molding at elevated temperature or heating of tablets that
were manufactured by conventional compression in a first step and
then heated above the softening temperature of the polymer in the
tablet in a second step to form hard tablets. In this regards,
thermoforming means the forming, or molding of a mass after the
application of heat. In a preferred embodiment, the pharmaceutical
dosage form is thermoformed by hot-melt extrusion.
[0028] Preferably, the pharmaceutical dosage form is a monolithic
mass. The pharmaceutical dosage form is preferably prepared by
hot-melt extrusion. The melt extruded strands are preferably cut
into monoliths, which are then preferably formed into tablets. In
this regard, the term "tablets" is preferably not to be understood
as dosage forms being made by compression of powder or granules
(compressi) but rather, as shaped extrudates.
[0029] The pharmaceutical dosage form according to the invention
contains, as component (A), an opioid (A), preferably an
oxidation-sensitive opioid (A), most preferably oxymorphone or
oxycodone. For the purpose of the specification, the term opioid
(A) also includes the free base and the physiologically acceptable
salts thereof.
[0030] According to the ATC index, opioids are divided into natural
opium alkaloids, phenylpiperidine derivatives, diphenylpropylamine
derivatives, benzomorphan derivatives, oripavine derivatives,
morphinan derivatives and others. Examples of natural opium
alkaloids are morphine, opium, hydromorphone, nicomorphine,
oxycodone, dihydrocodeine, diamorphine, papaveretum, and codeine.
Further opioids (A) are, for example, ethylmorphine, hydrocodone,
oxymorphone, and the physiologically acceptable derivatives thereof
or compounds, preferably the salts and solvates thereof, preferably
the hydrochlorides thereof, physiologically acceptable enantiomers,
stereoisomers, diastereomers and racemates and the physiologically
acceptable derivatives thereof, preferably ethers, esters or
amides.
[0031] Further preferred opioids (A) include
N-(1-methyl-2-piperidinoethyl)-N-(2-pyridyl)propionamide,
(1R,2R)-3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol,
(1R,2R,4S)-2-(dimethyl-amino)methyl-4-(p-fluorobenzyloxy)-1-(m-methoxyphe-
nyl)cyclohexanol,
(1R,2R)-3-(2-dimethylaminomethyl-cyclohexyl)phenol,
(1S,2S)-3-(3-dimethylamino-1-ethyl-2-methyl-propyl)-phenol,
(2R,3R)-1-dimethylannino-3(3-methoxyphenyl)-2-methyl-pentan-3-ol,
(1RS,3RS-6RS)-6-dimethylaminomethyl-1-(3-methoxyphenyl)-cyclohexane-1,3-d-
iol, preferably as racemate,
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)phenyl
2-(4-isobutyl-phenyl)propionate,
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)phenyl
2-(6-methoxy-naphthalen-2-yl)-propionate,
3-(2-dimethylaminomethyl-cyclohex-1-enyl)-phenyl
2-(4-isobutyl-phenyl)propionate,
3-(2-dimethylaminomethyl-cyclohex-1-enyl)-phenyl
2-(6-methoxy-naphthalen-2-yl)-propionate,
(RR--SS)-2-acetoxy-4-trifluoromethyl-benzoic acid
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)-phenyl ester,
(RR--SS)-2-hydroxy-4-trifluoromethyl-benzoic acid
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)-phenyl ester,
(RR--SS)-4-chloro-2-hydroxy-benzoic acid
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)-phenyl ester,
(RR--SS)-2-hydroxy-4-methyl-benzoic acid
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)-phenyl ester,
(RR--SS)-2-hydroxy-4-methoxy-benzoic acid
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)-phenyl ester,
(RR--SS)-2-hydroxy-5-nitro-benzoic acid
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)-phenyl ester,
(RR--SS)-2',4'-difluoro-3-hydroxy-biphenyl-4-carboxylic acid
3-(2-dimethylaminomethyl-1-hydroxy-cyclohexyl)-phenyl ester,
1,1-(3-dimethylamino-3-phenyl-pentamethylene)-6-fluor-1,3,4,9-tetrahydrop-
yrano[3,4-b]indole, in particular its hemicitrate;
1,1-[3-dimethylannino-3-(2-thienyl)pentamethylen]-1,3,4,9-tetrahydropyran-
o[3,4-b]indole, in particular its citrate; and
1,1-[3-dimethylamino-3-(2-thienyl)pentamethylen]-1,3,4,9-tetra-hydropyran-
o[3,4-b]-6-fluoro-indole, in particular its hemicitrate, and
corresponding stereo-isomeric compounds, in each case the
corresponding derivatives thereof, physiologically acceptable
enantiomers, stereoisomers, diastereomers and racemates and the
physiologically acceptable derivatives thereof, e.g. ethers, esters
or amides, and in each case the physiologically acceptable
compounds thereof, in particular the salts thereof and solvates,
e.g. hydrochlorides.
[0032] Preferred opioids (A) are of general formula (I)
##STR00001##
[0033] wherein [0034] R.sub.1 is --H, --OH or --OC.sub.1-6-alkyl;
[0035] R.sub.2 is --H or --C.sub.1-6-alkyl; [0036] R.sub.3 is --H
or --OH and R.sub.4 is --H; or R.sub.3 and R.sub.4 together are
.dbd.O; and [0037] --is an optional double bond;
[0038] or the physiologically acceptable salts thereof.
[0039] Particularly preferred opioids (A) include oxymorphone,
oxycodone, hydromorphone, and the physiologically acceptable salts
thereof.
[0040] The content of the opioid (A) in the pharmaceutical dosage
form is not limited.
[0041] Preferably, its content is within the range of from 0.01 to
80 wt.-%, more preferably 0.1 to 50 wt.-%, still more preferably 1
to 25 wt.-%, based on the total weight of the pharmaceutical dosage
form. In a preferred embodiment, the content of opioid (A) is
within the range of from 7.+-.6 wt.-%, more preferably 7.+-.5
wt.-%, still more preferably 5.+-.4 wt.-%, 7.+-.4 wt.-% or 9.+-.4
wt.-%, most preferably 5.+-.3 wt.-%, 7.+-.3 wt.-% or 9.+-.3 wt.-%,
and in particular 5.+-.2 wt.-%, 7.+-.2 wt.-% or 9.+-.2 wt.-%, based
on the total weight of the pharmaceutical dosage form. In another
preferred embodiment, the content of opioid (A) is within the range
of from 11.+-.10 wt.-%, more preferably 11.+-.9 wt.-%, still more
preferably 9.+-.6 wt.-%, 11.+-.6 wt.-%, 13.+-.6 wt.-% or 15.+-.6
wt.-%, most preferably 11.+-.4 wt.-%, 13.+-.4 wt.-% or 15.+-.4
wt.-%, and in particular 11.+-.2 wt.-%, 13.+-.2 wt.-% or 15.+-.2
wt.-%, based on the total weight of the pharmaceutical dosage form.
In a further preferred embodiment, the content of opioid (A) is
within the range of from 20.+-.6 wt.-%, more preferably 20.+-.5
wt.-%, still more preferably 20.+-.4 wt.-%, most preferably 20.+-.3
wt.-%, and in particular 20.+-.2 wt.-%, based on the total weight
of the pharmaceutical dosage form.
[0042] Preferably, the total amount of the opioid (A) that is
contained in the pharmaceutical dosage form is within the range of
from 0.01 to 200 mg, more preferably 0.1 to 190 mg, still more
preferably 1.0 to 180 mg, yet more preferably 1.5 to 160 mg, most
preferably 2.0 to 100 mg and in particular 2.5 to 80 mg.
[0043] In a preferred embodiment, the opioid (A) is contained in
the pharmaceutical dosage form in an amount of 7.5.+-.5 mg, 10.+-.5
mg, 20.+-.5 mg, 30.+-.5 mg, 40.+-.5 mg, 50.+-.5 mg, 60.+-.5 mg,
70.+-.5 mg, 80.+-.5 mg, 90.+-.5 mg, 100.+-.5 mg, 110.+-.5 mg,
120.+-.5 mg, 130.+-.5, 140.+-.5 mg, 150.+-.5 mg, or 160.+-.5 mg. In
another preferred embodiment, the opioid (A) is contained in the
pharmaceutical dosage form in an amount of 5.+-.2.5 mg, 7.5.+-.2.5
mg, 10.+-.2.5 mg, 15.+-.2.5 mg, 20.+-.2.5 mg, 25.+-.2.5 mg,
30.+-.2.5 mg, 35.+-.2.5 mg, 40.+-.2.5 mg, 45.+-.2.5 mg, 50.+-.2.5
mg, 55.+-.2.5 mg, 60.+-.2.5 mg, 65.+-.2.5 mg, 70.+-.2.5 mg,
75.+-.2.5 mg, 80.+-.2.5 mg, 85.+-.2.5 mg, 90.+-.2.5 mg, 95.+-.5 mg,
100.+-.2.5 mg, 105.+-.2.5 mg, 110.+-.2.5 mg, 115.+-.2.5 mg,
120.+-.2.5 mg, 125.+-.2.5 mg, 130.+-.2.5 mg, 135.+-.2.5 mg,
140.+-.2.5 mg, 145.+-.2.5 mg, 150.+-.2.5 mg, 155.+-.2.5 mg, or
160.+-.2.5 mg.
[0044] In a particularly preferred embodiment, opioid (A) is
oxymorphone, preferably its HCl salt, and the pharmaceutical dosage
form is adapted for administration twice daily. In this embodiment,
opioid (A) is preferably contained in the pharmaceutical dosage
form in an amount of from 5 to 40 mg. In another particularly
preferred embodiment, opioid (A) is oxymorphone, preferably its
HCl, and the pharmaceutical dosage form is adapted for
administration once daily. In this embodiment, opioid (A) is
preferably contained in the pharmaceutical dosage form in an amount
of from 10 to 80 mg.
[0045] In another particularly preferred embodiment, opioid (A) is
oxycodone, preferably its HCl salt, and the pharmaceutical dosage
form is adapted for administration twice daily. In this embodiment,
opioid (A) is preferably contained in the pharmaceutical dosage
form in an amount of from 5 to 80 mg. In another particularly
preferred embodiment, opioid (A) is oxycodone, preferably its HCl,
and the pharmaceutical dosage form is adapted for administration
once daily. In this embodiment, opioid (A) is preferably contained
in the pharmaceutical dosage form in an amount of from 10 to 320
mg.
[0046] In still another particularly preferred embodiment, opioid
(A) is hydromorphone, preferably its HCl, and the pharmaceutical
dosage form is adapted for administration twice daily. In this
embodiment, opioid (A) is preferably contained in the
pharmaceutical dosage form in an amount of from 2 to 52 mg. In
another particularly preferred embodiment, opioid (A) is
hydromorphone, preferably its HCl, and the pharmaceutical dosage
form is adapted for administration once daily. In this embodiment,
opioid (A) is preferably contained in the pharmaceutical dosage
form in an amount of from 4 to 104 mg.
[0047] The pharmaceutical dosage form according to the invention is
characterized by excellent storage stability. Preferably, after
storage for 4 weeks at 40.degree. C. and 75% rel. humidity, the
content of opioid (A) amounts to at least 98.0%, more preferably at
least 98.5%, still more preferably at least 99.0%, yet more
preferably at least 99.2%, most preferably at least 99.4% and in
particular at least 99.6%, of its original content before storage.
Suitable methods for measuring the content of the opioid (A) in the
pharmaceutical dosage form are known to the skilled artisan. In
this regard it is referred to the Eur. Ph. or the USP, especially
to reversed phase HPLC analysis. Preferably, the pharmaceutical
dosage form is stored in closed, preferably sealed containers,
preferably as described in the experimental section, most
preferably being equipped with an oxygen scavenger, in particular
with an oxygen scavenger that is effective even at low relative
humidity.
[0048] The pharmaceutical dosage form according to the invention
contains, as component (B), a free physiologically acceptable acid
in an amount of from 0.001 to 5.0 wt.-%, based on the total weight
of the pharmaceutical dosage form. The acid (B) may be organic or
inorganic, liquid or solid. Solid acids are preferred, particularly
crystalline organic or inorganic acids.
[0049] Acid (B) is free. This means that the acidic functional
groups of the acid (B) are not all together constituents of a salt
of the opioid (A). If the opioid (A) is present as a salt of an
acid, e.g. as hydrochloride, the pharmaceutical dosage form
according to the invention preferably contains as component (B)
another, chemically different acid which is not present as a
constituent of the salt of the opioid (A). In other words,
monoacids that form a salt with opioid (A) are not to be considered
as free acids (B) in the meaning of the present invention. When
acid (B) has more than a single acidic functional group (e.g.
phosphoric acid), the acid (B) may be present as a constituent of a
salt of the opioid (A), provided that at least one of the acidic
functional groups of the acid (B) is not involved in the formation
of the salt, i.e. is free. Preferably, however, each and every
acidic functional group of acid (B) is not involved in the
formation of a salt with opioid (A). It is also possible, however,
that free acid (B) and the acid forming a salt with opioid (A) are
identical. Under these circumstances the acid (B) is preferably
present in molar excess compared to opioid (A).
[0050] In a preferred embodiment, the acid (B) contains at least
one acidic functional group (e.g. --CO.sub.2H, --S.sub.3H,
--PO.sub.3H.sub.2, --OH and the like) having a pK.sub.A value
within the range of 2.00.+-.1.50, more preferably 2.00.+-.1.25,
still more preferably 2.00.+-.1.00, yet more preferably
2.00.+-.0.75, most preferably 2.00.+-.0.50 and in particular
2.00.+-.0.25. In another preferred embodiment, the acid (B)
contains at least one acidic functional group having a pK.sub.A
value within the range of 2.25.+-.1.50, more preferably
2.25.+-.1.25, still more preferably 2.25.+-.1.00, yet more
preferably 2.25.+-.0.75, most preferably 2.25.+-.0.50 and in
particular 2.25.+-.0.25. In another preferred embodiment, the acid
(B) contains at least one acidic functional group having a pK.sub.A
value within the range of 2.50.+-.1.50, more preferably
2.50.+-.1.25, still more preferably 2.50.+-.1.00, yet more
preferably 2.50.+-.0.75, most preferably 2.50.+-.0.50 and in
particular 2.50.+-.0.25. In another preferred embodiment, the acid
(B) contains at least one acidic functional group having a pK.sub.A
value within the range of 2.75.+-.1.50, more preferably
2.75.+-.1.25, still more preferably 2.75.+-.1.00, yet more
preferably 2.75.+-.0.75, most preferably 2.75.+-.0.50 and in
particular 2.75.+-.0.25. In another preferred embodiment, the acid
(B) contains at least one acidic functional group having a pK.sub.A
value within the range of 3.00.+-.1.50, more preferably
3.00.+-.1.25, still more preferably 3.00.+-.1.00, yet more
preferably 3.00.+-.0.75, most preferably 3.00.+-.0.50 and in
particular 3.00.+-.0.25. In still another preferred embodiment, the
acid (B) contains at least one acidic functional group having a
pK.sub.A value within the range of 3.25.+-.1.50, more preferably
3.25.+-.1.25, still more preferably 3.25.+-.1.00, yet more
preferably 3.25.+-.0.75, most preferably 3.25.+-.0.50 and in
particular 3.25.+-.0.25.
[0051] In yet another preferred embodiment, the acid (B) contains
at least one acidic functional group having a pK.sub.A value within
the range of 4.50.+-.1.50, more preferably 4.50.+-.1.25, still more
preferably 4.50.+-.1.00, yet more preferably 4.50.+-.0.75, most
preferably 4.50.+-.0.50 and in particular 4.50.+-.0.25. In yet
another preferred embodiment, the acid (B) contains at least one
acidic functional group having a pK.sub.A value within the range of
4.75.+-.1.50, more preferably 4.75.+-.1.25, still more preferably
4.75.+-.1.00, yet more preferably 4.75.+-.0.75, most preferably
4.75.+-.0.50 and in particular 4.75.+-.0.25. In yet another
preferred embodiment, the acid (B) contains at least one acidic
functional group having a pK.sub.A value within the range of
5.00.+-.1.50, more preferably 5.00.+-.1.25, still more preferably
5.00.+-.1.00, yet more preferably 5.00.+-.0.75, most preferably
5.00.+-.0.50 and in particular 5.00.+-.0.25.
[0052] Preferably, the acid (B) is an organic carboxylic or
sulfonic acid, particularly a carboxylic acid. Multicarboxylic
acids and/or hydroxy-carboxylic acids are especially preferred.
[0053] In case of multicarboxylic acids, the partial salts thereof
are also to be regarded as multi-carboxylic acids, e.g. the partial
sodium, potassium or ammonium salts. For example, citric acid is a
multicarboxylic acid having three carboxyl groups. As long as there
remains at least one carboxyl group protonated (e.g. sodium
dihydrogen citrate or disodium hydrogen citrate), the salt is to be
regarded as a multicarboxylic acid. Preferably, however, all
carboxyl groups of the multicarboxylic acid are protonated.
[0054] Preferably, the acid (B) is of low molecular weight, i.e.,
not polymerized. Typically, the molecular weight of the acid (B) is
below 500 g/mol.
[0055] Examples of acids include saturated and unsaturated
monocarboxylic acids, saturated and unsaturated bicarboxylic acids,
tricarboxylic acids, .alpha.-hydroxyacids and .beta.-hydroxylacids
of monocarboxylic acids, .alpha.-hydroxyacids and
.beta.-hydroxyacids of bicarboxylic acids, .alpha.-hydroxy-acids
and .beta.-hydroxyacids of tricarboxylic acids, ketoacids,
.alpha.-ketoacids, .beta.-ketoacids, of the polycarboxylic acids,
of the polyhydroxy monocarboxylic acids, of the polyhydroxy
bicarboxylic acids, of the polyhydroxy tricarboxylic acids.
[0056] Preferably, the acid (B) is selected from the group
consisting of benzenesulfonic acid, citric acid,
.alpha.-glucoheptonic acid, D-gluconic acid, glycolic acid, lactic
acid, malic acid, malonic acid, mandelic acid, propanoic acid,
succinic acid, tartaric acid (d, I, or dI), tosic acid
(toluene-sulfonic acid), valeric acid, palmitic acid, pamoic acid,
sebacic acid, stearic acid, lauric acid, acetic acid, adipic acid,
glutaric acid, 4-chlorobenzenesulfonic acid, ethanedisulfonic acid,
ethylsuccinic acid, fumaric acid, galactaric acid (mucic acid),
D-glucuronic acid, 2-oxo-glutaric acid, glycerophosphoric acid,
hippuric acid, isethionic acid (ethanolsulfonic acid), lactobionic
acid, maleic acid, maleinic acid, 1,5-naphthalene-disulfonic acid,
2-naphthalene-sulfonic acid, pivalic acid, terephthalic acid,
thiocyanic acid, cholic acid, n-dodecyl sulfate,
3-hydroxy-2-naphthoic acid, 1-hydroxy-2-naphthoic acid, oleic acid,
undecylenic acid, ascorbic acid, (+)-camphoric acid,
d-camphorsulfonic acid, dichloroacetic acid, ethanesulfonic acid,
formic acid, methanesulfonic acid, nicotinic acid, orotic acid,
oxalic acid, picric acid, L-pyroglutamic acid, saccharine,
salicylic acid, gentisic acid, and/or 4-acetamidobenzoic acid.
[0057] The content of the acid (B) is within the range of from
0.001 to 5.0 wt.-%, preferably 0.005 to 2.5 wt.-%, more preferably
0.01 to 2.0 wt.-%, still more preferably 0.05 to 1.5 wt.-%, most
preferably 0.1 to 1.0 wt.-% and in particular 0.2 to 0.9 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0058] Preferably, the acid (B) is a multicarboxylic acid. More
preferably, the multicarboxylic acid is selected from the group
consisting of citric acid, maleic acid and fumaric acid.
[0059] Citric acid is particularly preferred.
[0060] The multicarboxylic acid, preferably citric acid, may be
present in its anhydrous form or as a solvate and hydrate,
respectively, e.g., as citric acid monohydrate.
[0061] In a preferred embodiment, the content of the acid (B),
preferably citric acid is within the range of 0.2.+-.0.18 wt.-%,
more preferably 0.2.+-.0.15 wt.-%, still more preferably
0.2.+-.0.12 wt.-%, yet more preferably 0.2.+-.0.09 wt.-%, most
preferably 0.2.+-.0.06 wt.-%, and in particular 0.2.+-.0.03 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0062] In another preferred embodiment, the content of the acid
(B), preferably citric acid is within the range of 0.3.+-.0.18
wt.-%, more preferably 0.3.+-.0.15 wt.-%, still more preferably
0.3.+-.0.12 wt.-%, yet more preferably 0.3.+-.0.09 wt.-%, most
preferably 0.3.+-.0.06 wt.-%, and in particular 0.3.+-.0.03 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0063] In still another preferred embodiment, the content of the
acid (B), preferably citric acid is within the range of 0.4.+-.0.18
wt.-%, more preferably 0.4.+-.0.15 wt.-%, still more preferably
0.4.+-.0.12 wt.-%, yet more preferably 0.4.+-.0.09 wt.-%, most
preferably 0.4.+-.0.06 wt.-%, and in particular 0.4.+-.0.03 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0064] In yet another preferred embodiment, the content of the acid
(B), preferably citric acid is within the range of 0.5.+-.0.18
wt.-%, more preferably 0.5.+-.0.15 wt.-%, still more preferably
0.5.+-.0.12 wt.-%, yet more preferably 0.5.+-.0.09 wt.-%, most
preferably 0.5.+-.0.06 wt.-%, and in particular 0.5.+-.0.03 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0065] In yet another preferred embodiment, the content of the acid
(B), preferably citric acid is within the range of 0.6.+-.0.18
wt.-%, more preferably 0.6.+-.0.15 wt.-%, still more preferably
0.6.+-.0.12 wt.-%, yet more preferably 0.6.+-.0.09 wt.-%, most
preferably 0.6.+-.0.06 wt.-%, and in particular 0.6.+-.0.03 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0066] In yet another preferred embodiment, the content of the acid
(B), preferably citric acid is within the range of 0.7.+-.0.18
wt.-%, more preferably 0.7.+-.0.15 wt.-%, still more preferably
0.7.+-.0.12 wt.-%, yet more preferably 0.7.+-.0.09 wt.-%, most
preferably 0.7.+-.0.06 wt.-%, and in particular 0.7.+-.0.03 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0067] In yet another preferred embodiment, the content of citric
acid is within the range of 0.8.+-.0.18 wt.-%, more preferably
0.8.+-.0.15 wt.-%, still more preferably 0.8.+-.0.12 wt.-%, yet
more preferably 0.8.+-.0.09 wt.-%, most preferably 0.8.+-.0.06
wt.-%, and in particular 0.8.+-.0.03 wt.-%, based on the total
weight of the pharmaceutical dosage form.
[0068] In yet another preferred embodiment, the content of the acid
(B), preferably citric acid is within the range of 0.85.+-.0.18
wt.-%, more preferably 0.85.+-.0.15 wt.-%, still more preferably
0.85.+-.0.12 wt.-%, yet more preferably 0.85.+-.0.09 wt.-%, most
preferably 0.85.+-.0.06 wt.-%, and in particular 0.85.+-.0.03
wt.-%, based on the total weight of the pharmaceutical dosage
form.
[0069] In still another preferred embodiment, the content of the
acid (B), preferably citric acid is within the range of 0.9.+-.0.18
wt.-%, more preferably 0.9.+-.0.15 wt.-%, still more preferably
0.9.+-.0.12 wt.-%, yet more preferably 0.9.+-.0.09 wt.-%, most
preferably 0.9.+-.0.06 wt.-%, and in particular 0.9.+-.0.03 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0070] In a further preferred embodiment, the content of the acid
(B), preferably citric acid is within the range of 1.0.+-.0.18
wt.-%, more preferably 1.0.+-.0.15 wt.-%, still more preferably
1.0.+-.0.12 wt.-%, yet more preferably 1.0.+-.0.09 wt.-%, most
preferably 1.0.+-.0.06 wt.-%, and in particular 1.0.+-.0.03 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0071] The pharmaceutical dosage form according to the invention
comprises, as component (C), a polyalkylene oxide (C) having a
weight average molecular weight M.sub.w of at least 200,000 g/mol,
preferably at least 500,000 g/mol, more preferably at least 750,000
g/mol, still more preferably at least 1,000,000 g/mol, most
preferably at least 2,000,000 g/mol and in particular within the
range of from 500,000 to 15,000,000 g/mol.
[0072] Preferably, the polyalkylene oxide is selected from the
group consisting of polymethylene oxide, polyethylene oxide and
polypropylene oxide, the copolymers and mixtures thereof.
[0073] Polyalkylene oxide (C) may comprise a single polyalkylene
oxide having a particular average molecular weight, or a mixture
(blend) of different polymers, such as two, three, four or five
polymers, e.g., polymers of the same chemical nature but different
average molecular weight, polymers of different chemical nature but
same average molecular weight, or polymers of different chemical
nature as well as different molecular weight.
[0074] For the purpose of the specification, a polyalkylene glycol
has a molecular weight of up to 20,000 g/mol whereas a polyalkylene
oxide has a molecular weight of more than 20,000 g/mol. In a
preferred embodiment, the weight average over all molecular weights
of all polyalkylene oxides that are contained in the pharmaceutical
dosage form is at least 200,000 g/mol. Thus, polyalkylene glycols,
if any, are preferably not taken into consideration when
determining the weight average molecular weight of polyalkylene
oxide (C).
[0075] Preferably, the content of the polyalkylene oxide (C) is
within the range of from 20 to 99 wt.-%, more preferably 25 to 95
wt.-%, still more preferably 30 to 90 wt.-%, yet more preferably 30
to 85 wt.-%, most preferably 30 to 80 wt.-% and in particular 30 to
75 wt.-%, based on the total weight of the pharmaceutical dosage
form. In a preferred embodiment, the content of the polyalkylene
oxide is at least 20 wt.-%, more preferably at least 25 wt.-%,
still more preferably at least 30 wt.-%, yet more preferably at
least 35 wt.-% and in particular at least 40 wt.-%.
[0076] In a preferred embodiment, the overall content of
polyalkylene oxide (C) is within the range of 25.+-.20 wt.-%, more
preferably 25.+-.15 wt.-%, most preferably 25.+-.10 wt.-%, and in
particular 25.+-.5 wt.-%. In another preferred embodiment, the
overall content of polyalkylene oxide (C) is within the range of
35.+-.20 wt.-%, more preferably 35.+-.15 wt.-%, most preferably
35.+-.10 wt.-%, and in particular 35.+-.5 wt.-%. In still another
preferred embodiment, the overall content of polyalkylene oxide (C)
is within the range of 45.+-.20 wt.-%, more preferably 45.+-.15
wt.-%, most preferably 45.+-.10 wt.-%, and in particular 45.+-.5
wt.-%. In yet another preferred embodiment, the overall content of
polyalkylene oxide (C) is within the range of 55.+-.20 wt.-%, more
preferably 55.+-.15 wt.-%, most preferably 55.+-.10 wt.-%, and in
particular 55.+-.5 wt.-%. In a further preferred embodiment, the
overall content of polyalkylene oxide (C) is within the range of
65.+-.20 wt.-%, more preferably 65.+-.15 wt.-%, most preferably
65.+-.10 wt.-%, and in particular 65.+-.5 wt.-%. In still a further
a preferred embodiment, the overall content of polyalkylene oxide
(C) is within the range of 75.+-.20 wt.-%, more preferably 75.+-.15
wt.-%, most preferably 75.+-.10 wt.-%, and in particular 75.+-.5
wt.-%. In a still further a preferred embodiment, the overall
content of polyalkylene oxide (C) is within the range of 80.+-.15
wt.-%, more preferably 80.+-.10 wt.-%, and most preferably 80.+-.5
wt.-%.
[0077] In a preferred embodiment, polyalkylene oxide (C) is
homogeneously distributed in the pharmaceutical dosage form
according to the invention. Preferably, polyalkylene oxide (C)
forms a matrix in which the opioid (A) is embedded. In a
particularly preferred embodiment, the opioid (A) and polyalkylene
oxide (C) are intimately homogeneously distributed in the
pharmaceutical dosage form so that the pharmaceutical dosage form
does not contain any segments where either opioid (A) is present in
the absence of polyalkylene oxide (C) or where polyalkylene oxide
(C) is present in the absence of opioid (A).
[0078] When the pharmaceutical dosage form is film coated, the
polyalkylene oxide (C) is preferably homogeneously distributed in
the core of the pharmaceutical dosage form, i.e. the film coating
preferably does not contain polyalkylene oxide (C). Nonetheless,
the film coating as such may of course contain one or more
polymers, which however, preferably differ from the polyalkylene
oxide (C) contained in the core.
[0079] The polyalkylene oxide (C) may be combined with one or more
different polymers selected from the group consisting of
polyalkylene oxide, preferably polymethylene oxide, polyethylene
oxide, polypropylene oxide; polyethylene, polypropylene, polyvinyl
chloride, polycarbonate, polystyrene, polyvinylpyrrolidone,
poly(alk)acrylate, poly(hydroxy fatty acids), such as for example
poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (Biopol.RTM.),
poly(hydroxyvaleric acid); polycaprolactone, polyvinyl alcohol,
polyesteramide, polyethylene succinate, polylactone, polyglycolide,
polyurethane, polyamide, polylactide, polyacetal (for example
polysaccharides optionally with modified side chains),
polylactide/glycolide, polylactone, polyglycolide, polyorthoester,
polyanhydride, block polymers of polyethylene glycol and
polybutylene terephthalate (Polyactive.RTM.), polyanhydride
(Polifeprosan), copolymers thereof, block-copolymers thereof, and
mixtures of at least two of the stated polymers, or other polymers
with the above characteristics.
[0080] Preferably, the molecular weight dispersity M.sub.w/M.sub.n
of polyalkylene oxide (C) is within the range of 2.5.+-.2.0, more
preferably 2.5.+-.1.5, still more preferably 2.5.+-.1.0, yet more
preferably 2.5.+-.0.8, most preferably 2.5.+-.0.6, and in
particular 2.5.+-.0.4.
[0081] The polyalkylene oxide (C) preferably has a viscosity at
25.degree. C. of 30 to 17,600 cP, more preferably 55 to 17,600 cP,
still more preferably 600 to 17,600 cP and most preferably 4,500 to
17,600 cP, measured in a 5 wt.-% aqueous solution using a model RVF
Brookfield viscosimeter (spindle no. 2/rotational speed 2 rpm); of
400 to 4,000 cP, more preferably 400 to 800 cP or 2,000 to 4,000
cP, measured on a 2 wt.-% aqueous solution using the stated
viscosimeter (spindle no. 1 or 3/rotational speed 10 rpm); or of
1,650 to 10,000 cP, more preferably 1,650 to 5,500 cP, 5,500 to
7,500 cP or 7,500 to 10,000 cP, measured on a 1 wt.-% aqueous
solution using the stated viscosimeter (spindle no. 2/rotational
speed 2 rpm).
[0082] In a preferred embodiment according to the invention the
polyalkylene oxide (C) having a weight average molecular weight of
at least 200,000 g/mol is combined with at least one further
polymer, preferably but not necessarily also having a weight
average molecular weight (M.sub.w) of at least 200,000 g/mol,
selected from the group consisting of polyethylene, polypropylene,
polyvinyl chloride, polycarbonate, polystyrene, polyacrylate,
poly(hydroxy fatty acids), polycaprolactone, polyvinyl alcohol,
polyesteramide, polyethylene succinate, polylactone, polyglycolide,
polyurethane, polyvinylpyrrolidone, polyamide, polylactide,
polylactide/glycolide, polylactone, polyglycolide, polyorthoester,
polyanhydride, block polymers of polyethylene glycol and
polybutylene terephthalate, polyanhydride, polyacetal, cellulose
esters, cellulose ethers and copolymers thereof. Cellulose esters
and cellulose ethers are particularly preferred, e.g.
methylcellulose, ethylcellulose, hydroxymethylcellulose,
hydroxy-ethylcellulose, hydroxypropylcellulose
hydroxypropylmethylcellulose, carboxymethylcellulose, and the
like.
[0083] In a preferred embodiment, said further polymer is neither a
polyalkylene oxide nor a poly-alkylene glycol. Nonetheless, the
pharmaceutical dosage form may contain polyalkylene glycol, e.g. as
plasticizer, but then, the pharmaceutical dosage form preferably is
a ternary mixture of polymers: polyalkylene oxide (C)+further
polymer+plasticizer.
[0084] In a particularly preferred embodiment, said further polymer
is a hydrophilic cellulose ester or cellulose ether, preferably
hydroxypropylmethylcellulose (HPMC), hydroxypropylcellulose (HPC)
or hydroxyethylcellulose (HEC), preferably having an average
viscosity (preferably measured by capillary viscosimetry or
rotational viscosimetry) of 1,000 to 150,000 mPas, more preferably
3,000 to 150,000. In a preferred embodiment, the average viscosity
is within the range of 110,000.+-.50,000 mPas, more preferably
110,000.+-.40,000 mPas, still more preferably 110,000.+-.30,000
mPas, most preferably 110,000.+-.20,000 mPas, and in particular
100,000.+-.10,000 mPas.
[0085] In a preferred embodiment the relative weight ratio of said
polyalkylene oxide (C) and said further polymer is within the range
of from 20:1 to 1:20, more preferably 10:1 to 1:10, still more
preferably 7:1 to 1:5, yet more preferably 5:1 to 1:1, most
preferably 4:1 to 1,5:1 and in particular 3:1 to 2:1. In a
preferred embodiment, the relative weight ratio of said
polyalkylene oxide (C) and said further polymer is within the range
of from 10:1 to 5:1, more preferably 8:1 to 5:1, most preferably
7:1 to 5:1.
[0086] Preferably, the content of said further polymer amounts to
0.5 to 25 wt.-%, more preferably 1.0 to 20 wt.-%, still more
preferably 2.0 to 22.5 wt.-%, yet more preferably 3.0 to 20 wt.-%
and most preferably 4.0 to 17.5 wt.-% and in particular 5.0 to 15
wt.-%, based on the total weight of the pharmaceutical dosage
form.
[0087] In a preferred embodiment, the further polymer is a
cellulose ester or cellulose ether, preferably HPMC, having a
content within the range of 10.+-.8 wt.-%, more preferably 10.+-.6
wt.-%, still more preferably 10.+-.5 wt.-%, yet more preferably
10.+-.4 wt.-%, most preferably 10.+-.3 wt.-%, and in particular
10.+-.2 wt.-%, based on the total weight of the pharmaceutical
dosage form.
[0088] In another preferred embodiment, the further polymer is a
cellulose ester or cellulose ether, preferably HPMC, having a
content within the range of 14.+-.8 wt.-%, more preferably 14.+-.6
wt.-%, still more preferably 14.+-.5 wt.-%, yet more preferably
14.+-.4 wt.-%, most preferably 14.+-.3 wt.-%, and in particular
14.+-.2 wt.-%, based on the total weight of the pharmaceutical
dosage form.
[0089] All polymers are preferably employed as powders. They can be
soluble in water.
[0090] Besides the opioid (A), the acid (B) and polyalkylene oxide
(C) the pharmaceutical dosage form according to the invention may
contain further constituents, such as conventional pharmaceutical
excipients.
[0091] Preferably, the pharmaceutical dosage form comprises an
antioxidant. Suitable antioxidants include ascorbic acid,
.alpha.-tocopherol (vitamin E), butylhydroxyanisol,
butylhydroxytoluene, salts of ascorbic acid (vitamin C), ascorbylic
palmitate, monothioglycerine, coniferyl benzoate,
nordihydroguajaretic acid, gallus acid esters, phosphoric acid, and
the derivatives thereof, such as vitamin E-succinate or vitamin
E-palmitate and/or sodium bisulphite, more preferably
butylhydroxytoluene (BHT) or butylhydroxyanisol (BHA) and/or
.alpha.-tocopherol.
[0092] Preferably, the content of the antioxidant is within the
range of from 0.001 to 5.0 wt.-%, more preferably 0.002 to 2.5
wt.-%, more preferably 0.003 to 1.5 wt.-%, still more preferably
0.005 to 1.0 wt.-%, yet more preferably 0.01 to 0.5 wt.-%, most
preferably 0.05 to 0.4 wt.-% and in particular 0.1 to 0.3 wt.-%,
based on the total weight of the pharmaceutical dosage form.
[0093] A particularly preferred antioxidant is .alpha.-tocopherol.
It has been surprisingly found that .alpha.-tocopherol stabilizes
polyalkylene oxide and simultaneously destabilizes certain opioids
(A), such as oxymorphone. Thus, in a preferred embodiment, the
content of .alpha.-tocopherol is balanced between a sufficient
stability of the polyalkylene oxide on the one hand and a
sufficient stability of the opioid (A) on the other hand.
[0094] In a preferred embodiment, the content of .alpha.-tocopherol
is within the range of 0.2.+-.0.18 wt.-%, more preferably
0.2.+-.0.15 wt.-%, still more preferably 0.2.+-.0.12 wt.-%, yet
more preferably 0.2.+-.0.09 wt.-%, most preferably 0.2.+-.0.06
wt.-%, and in particular 0.2.+-.0.03 wt.-%, based on the total
weight of the pharmaceutical dosage form.
[0095] In a preferred embodiment, the relative weight ratio of the
acid (B), preferably citric acid, and the antioxidant, preferably
.alpha.-tocopherol, is within the range of from 10:1 to 1:10, more
preferably 8:1 to 1:8, still more preferably 6:1 to 1:6, yet more
preferably 5:1 to 1:4, most preferably 4:1 to 1:3 and in particular
3:1 to 1:2.
[0096] The pharmaceutical dosage form according to the invention
may also contain a natural, semi-synthetic or synthetic wax. Waxes
with a softening point of at least 50.degree. C., more preferably
60.degree. C. are preferred. Carnauba wax and beeswax are
particularly preferred, especially carnauba wax.
[0097] Preferably, the release profile of the opioid (A) is
matrix-retarded. Preferably, the opioid (A) is embedded in a matrix
comprising the polyalkylene oxide, said matrix controlling the
release of the opioid (A) from the pharmaceutical dosage form.
[0098] Physiologically acceptable materials which are known to the
person skilled in the art may be used as supplementary matrix
materials. Polymers, particularly preferably cellulose ethers,
cellulose esters and/or acrylic resins are preferably used as
hydrophilic matrix materials. Ethylcellulose,
hydroxypropylmethylcellulose, hydroxypropylcellulose,
hydroxymethylcellulose, hydroxyethylcellulose, poly(meth)acrylic
acid and/or the derivatives thereof, such as the salts, amides or
esters thereof are very particularly preferably used as matrix
materials.
[0099] Matrix materials prepared from hydrophobic materials, such
as hydrophobic polymers, waxes, fats, long-chain fatty acids, fatty
alcohols or corresponding esters or ethers or mixtures thereof are
also preferred. Mono- or diglycerides of C.sub.12-C.sub.30 fatty
acids and/or C.sub.12-C.sub.30 fatty alcohols and/or waxes or
mixtures thereof are particularly preferably used as hydrophobic
materials. It is also possible to use mixtures of the above-stated
hydrophilic and hydrophobic materials as matrix materials.
[0100] Preferably, the relative weight ratio of the polyalkylene
oxide to the opioid (A) is at least 0.5:1, more preferably at least
1:1, at least 2:1, at least 3:1, at least 4:1, at least 5:1, at
least 6:1, at least 7:1, at least 8:1 or at least 9:1; still more
preferably at least 10:1 or at least 15:1, yet more preferably at
least 20:1, most preferably at least 30:1 and in particular at
least 40:1. In a preferred embodiment, the relative weight ratio of
the polyalkylene oxide to the opioid (A) is within the range of
from 3:1 to 50:1, more preferably 3:1 to 40:1 and in particular 3:1
to 30:1.
[0101] The pharmaceutical dosage form according to the invention
preferably contains a plasticizer. The plasticizer improves the
processability of the polyalkylene oxide. A preferred plasticizer
is polyalkylene glycol, like polyethylene glycol, triacetin, fatty
acids, fatty acid esters, waxes and/or microcrystalline waxes.
Particularly preferred plasticizers are polyethylene glycols, such
as PEG 6000.
[0102] Preferably, the content of the plasticizer is within the
range of from 0.1 to 25 wt.-%, more preferably 0.5 to 22.5 wt.-%,
still more preferably 1.0 to 20 wt.-%, yet more preferably 2.5 to
17.5 wt.-%, most preferably 5.0 to 15 wt.-% and in particular 7.5
to 12.5 wt.-%, based on the total weight of the pharmaceutical
dosage form.
[0103] In a preferred embodiment, the plasticizer is a polyalkylene
glycol having a content within the range of 10.+-.8 wt.-%, more
preferably 10.+-.6 wt.-%, still more preferably 10.+-.5 wt.-%, yet
more preferably 10.+-.4 wt.-%, most preferably 10.+-.3 wt.-%, and
in particular 10.+-.2 wt.-%, based on the total weight of the
pharmaceutical dosage form.
[0104] In another preferred embodiment, the plasticizer is a
polyalkylene glycol having a content within the range of 15.+-.8
wt.-%, more preferably 15.+-.6 wt.-%, still more preferably 15.+-.5
wt.-%, yet more preferably 15.+-.4 wt.-%, most preferably 15.+-.3
wt.-%, and in particular 15.+-.2 wt.-%, based on the total weight
of the pharmaceutical dosage form.
[0105] In a preferred embodiment, the relative weight ratio of the
polyalkylene oxide to the polyalkylene glycol is within the range
of 4.2.+-.2:1, more preferably 4.2.+-.1.5:1, still more preferably
4.2.+-.1:1, yet more preferably 4.2.+-.0.5:1, most preferably
4.2.+-.0.2:1, and in particular 4.2.+-.0.1:1. This ratio satisfies
the requirements of relative high polyalkylene oxide content and
good extrudability.
[0106] When manufacturing the dosage forms from slices that are
obtained by cutting the extrudate strand, the weight of the slices
determines the weight of the resulting dosage form. Pronounced
variation in weight of these slices results in an accordant weight
deviation of dosage forms from the target weight. The weight
variation of slices depends strongly on the surface properties of
the extrudate strand. A strand with a thoroughly smooth surface
allows the generation of slices exhibiting a low weight variation.
In contrast, a wavy or shark skinning strand results in slices
exhibiting a higher weight variation thereby increasing the number
of rejects.
[0107] It has now been surprisingly found that the surface
properties of the extrudate strand can be triggered by the
polyalkylene oxide:polyalkylene glycol weight ratio.
[0108] Preferred compositions X.sub.1 to X.sub.32 of the
pharmaceutical dosage form according to the invention are
summarized in the tables here below:
TABLE-US-00001 wt.-% X.sub.1 X.sub.2 X.sub.3 X.sub.4 opioid (A)
(e.g. oxymorphone HCl) 1.50 .+-. 1.25 1.50 .+-. 1.00 1.50 .+-. 0.75
1.50 .+-. 0.50 acid (B) (e.g. citric acid) 0.5 .+-. 0.30 0.5 .+-.
0.25 0.5 .+-. 0.20 0.5 .+-. 0.15 polyalkylene oxide (C) 77 .+-. 22
77 .+-. 20 77 .+-. 15 77 .+-. 10 cellulose ester or ether (e.g.
HPMC) 12 .+-. 10 12 .+-. 7.5 12 .+-. 5 12 .+-. 2.5 plasticizer
(e.g. PEG) 10 .+-. 7.5 10 .+-. 5 10 .+-. 2.5 10 .+-. 1.0
antioxidant (e.g. .alpha.-tocopherol) 0.2 .+-. 0.12 0.2 .+-. 0.1
0.2 .+-. 0.05 0.2 .+-. 0.03
TABLE-US-00002 wt.-% X.sub.5 X.sub.6 X.sub.7 X.sub.8 opioid (A)
(e.g. oxymorphone HCl) 2.33 .+-. 1.25 2.33 .+-. 1.00 2.33 .+-. 0.75
2.33 .+-. 0.50 acid (B) (e.g. citric acid) 0.85 .+-. 0.60 0.85 .+-.
0.50 0.85 .+-. 0.25 0.85 .+-. 0.15 polyalkylene oxide (C) 70 .+-.
25 70 .+-. 20 70 .+-. 15 70 .+-. 10 cellulose ester or ether (e.g.
HPMC) 10 .+-. 9.5 10 .+-. 7.5 10 .+-. 5 10 .+-. 2.5 plasticizer
(e.g. PEG) 16.6 .+-. 7.5 16.6 .+-. 5 16.6 .+-. 2.5 16.6 .+-. 1.0
antioxidant (e.g. .alpha.-tocopherol) 0.2 .+-. 0.12 0.2 .+-. 0.1
0.2 .+-. 0.05 0.2 .+-. 0.03
TABLE-US-00003 wt.-% X.sub.9 X.sub.10 X.sub.11 X.sub.12 opioid (A)
(e.g. oxymorphone HCl) 3.50 .+-. 1.25 3.50 .+-. 1.00 3.50 .+-. 0.75
3.50 .+-. 0.50 acid (B) (e.g. citric acid) 0.85 .+-. 0.60 0.85 .+-.
0.50 0.85 .+-. 0.25 0.85 .+-. 0.15 polyalkylene oxide (C) 69 .+-.
30 69 .+-. 20 69 .+-. 15 69 .+-. 10 cellulose ester or ether (e.g.
HPMC) 10 .+-. 9.5 10 .+-. 7.5 10 .+-. 5 10 .+-. 2.5 plasticizer
(e.g. PEG) 16.4 .+-. 7.5 16.4 .+-. 5 16.4 .+-. 2.5 16.4 .+-. 1.0
antioxidant (e.g. .alpha.-tocopherol) 0.2 .+-. 0.12 0.2 .+-. 0.1
0.2 .+-. 0.05 0.2 .+-. 0.03
TABLE-US-00004 wt.-% X.sub.13 X.sub.14 X.sub.15 X.sub.16 opioid (A)
(e.g. oxymorphone HCl) 4.65 .+-. 1.25 4.65 .+-. 1.00 4.65 .+-. 0.75
4.65 .+-. 0.50 acid (B) (e.g. citric acid) 0.85 .+-. 0.60 0.85 .+-.
0.50 0.85 .+-. 0.25 0.85 .+-. 0.15 polyalkylene oxide (C) 68 .+-.
30 68 .+-. 20 68 .+-. 15 68 .+-. 10 cellulose ester or ether (e.g.
HPMC) 10 .+-. 9.5 10 .+-. 7.5 10 .+-. 5 10 .+-. 2.5 plasticizer
(e.g. PEG) 16.2 .+-. 7.5 16.2 .+-. 5 16.2 .+-. 2.5 16.2 .+-. 1.0
antioxidant (e.g. .alpha.-tocopherol) 0.2 .+-. 0.12 0.2 .+-. 0.1
0.2 .+-. 0.05 0.2 .+-. 0.03
TABLE-US-00005 wt.-% X.sub.17 X.sub.18 X.sub.19 X.sub.20 opioid (A)
(e.g. oxymorphone HCl) 6.98 .+-. 1.25 6.98 .+-. 1.00 6.98 .+-. 0.75
6.98 .+-. 0.50 acid (B) (e.g. citric acid) 0.85 .+-. 0.60 0.85 .+-.
0.50 0.85 .+-. 0.25 0.85 .+-. 0.15 polyalkylene oxide (C) 66 .+-.
30 66 .+-. 20 66 .+-. 15 66 .+-. 10 cellulose ester or ether (e.g.
HPMC) 10 .+-. 9.5 10 .+-. 7.5 10 .+-. 5 10 .+-. 2.5 plasticizer
(e.g. PEG) 15.8 .+-. 7.5 15.8 .+-. 5 15.8 .+-. 2.5 15.8 .+-. 1.0
antioxidant (e.g. .alpha.-tocopherol) 0.2 .+-. 0.12 0.2 .+-. 0.1
0.2 .+-. 0.05 0.2 .+-. 0.03
TABLE-US-00006 wt.-% X.sub.21 X.sub.22 X.sub.23 X.sub.24 opioid (A)
(e.g. oxymorphone HCl) 9.30 .+-. 1.25 9.30 .+-. 1.00 9.30 .+-. 0.75
9.30 .+-. 0.50 acid (B) (e.g. citric acid) 0.85 .+-. 0.60 0.85 .+-.
0.50 0.85 .+-. 0.25 0.85 .+-. 0.15 polyalkylene oxide (C) 64 .+-.
30 64 .+-. 20 64 .+-. 15 64 .+-. 10 cellulose ester or ether (e.g.
HPMC) 10 .+-. 9.5 10 .+-. 7.5 10 .+-. 5 10 .+-. 2.5 plasticizer
(e.g. PEG) 15.3 .+-. 7.5 15.3 .+-. 5 15.3 .+-. 2.5 15.3 .+-. 1.0
antioxidant (e.g. .alpha.-tocopherol) 0.2 .+-. 0.12 0.2 .+-. 0.1
0.2 .+-. 0.05 0.2 .+-. 0.03
TABLE-US-00007 wt.-% X.sub.25 X.sub.26 X.sub.27 X.sub.28 opioid (A)
(e.g. oxymorphone HCl) 13.95 .+-. 1.25 13.95 .+-. 1.00 13.95 .+-.
0.75 13.95 .+-. 0.50 acid (B) (e.g. citric acid) 0.85 .+-. 0.60
0.85 .+-. 0.50 0.85 .+-. 0.25 0.85 .+-. 0.15 polyalkylene oxide (C)
60 .+-. 30 60 .+-. 20 60 .+-. 15 60 .+-. 10 cellulose ester or
ether (e.g. HPMC) 10 .+-. 9.5 10 .+-. 7.5 10 .+-. 5 10 .+-. 2.5
plasticizer (e.g. PEG) 13.9 .+-. 7.5 13.9 .+-. 5 13.9 .+-. 2.5 13.9
.+-. 1.0 antioxidant (e.g. .alpha.-tocopherol) 0.2 .+-. 0.12 0.2
.+-. 0.1 0.2 .+-. 0.05 0.2 .+-. 0.03
TABLE-US-00008 wt.-% X.sub.29 X.sub.30 X.sub.31 X.sub.32 opioid (A)
(e.g. oxymorphone HCl) 18.60 .+-. 1.25 18.60 .+-. 1.00 18.60 .+-.
0.75 18.60 .+-. 0.50 acid (B) (e.g. citric acid) 0.85 .+-. 0.60
0.85 .+-. 0.50 0.85 .+-. 0.25 0.85 .+-. 0.15 polyalkylene oxide (C)
57 .+-. 30 57 .+-. 20 57 .+-. 15 57 .+-. 10 cellulose ester or
ether (e.g. HPMC) 10 .+-. 9.5 10 .+-. 7.5 10 .+-. 5 10 .+-. 2.5
plasticizer (e.g. PEG) 13.6 .+-. 7.5 13.6 .+-. 5 13.6 .+-. 2.5 13.6
.+-. 1.0 antioxidant (e.g. .alpha.-tocopherol) 0.2 .+-. 0.12 0.2
.+-. 0.1 0.2 .+-. 0.05 0.2 .+-. 0.03
[0109] In a preferred embodiment, the pharmaceutical dosage form
has a total weight within the range of 100.+-.75 mg, more
preferably 100.+-.50 mg, most preferably 100.+-.25 mg. In another
preferred embodiment, the pharmaceutical dosage form has a total
weight within the range of 200.+-.75 mg, more preferably 200.+-.50
mg, most preferably 200.+-.25 mg. In another preferred embodiment,
the pharmaceutical dosage form has a total weight within the range
of 250.+-.75 mg, more preferably 250.+-.50 mg, most preferably
250.+-.25 mg. In still another preferred embodiment, the
pharmaceutical dosage form has a total weight within the range of
300.+-.75 mg, more preferably 300.+-.50 mg, most preferably
300.+-.25 mg. In yet another preferred embodiment, the
pharmaceutical dosage form has a total weight within the range of
400.+-.75 mg, more preferably 400.+-.50 mg, most preferably
400.+-.25 mg.
[0110] In a preferred embodiment, the pharmaceutical dosage form
has a total weight within the range of 500.+-.250 mg, more
preferably 500.+-.200 mg, most preferably 500.+-.150 mg. In another
preferred embodiment, the pharmaceutical dosage form has a total
weight within the range of 750.+-.250 mg, more preferably
750.+-.200 mg, most preferably 750.+-.150 mg. In another preferred
embodiment, the pharmaceutical dosage form has a total weight
within the range of 1000.+-.250 mg, more preferably 1000.+-.200 mg,
most preferably 1000.+-.150 mg. In still another preferred
embodiment, the pharmaceutical dosage form has a total weight
within the range of 1250.+-.250 mg, more preferably 1250.+-.200 mg,
most preferably 1250.+-.150 mg.
[0111] In a preferred embodiment, the pharmaceutical dosage form
according to the invention has an overall density within the range
of 1.19.+-.0.30 g/cm.sup.3, more preferably 1.19.+-.0.25
g/cm.sup.3, still more preferably 1.19.+-.0.20 g/cm.sup.3, yet more
preferably 1.19.+-.0.15 g/cm.sup.3, most preferably 1.19.+-.0.10
g/cm.sup.3, and in particular 1.19.+-.0.05 g/cm.sup.3. Preferably,
the overall density of the pharmaceutical dosage form according to
the invention is 1.17.+-.0.02 g/cm.sup.3, 1.19.+-.0.02 g/cm.sup.3
or 1.21.+-.0.02 g/cm.sup.3. Methods for measuring the density of a
dosage form are known to a person skilled in the art. The overall
density of a dosage form can for example be determined by means of
the mercury porosimetry method or the helium pycnometer method as
described in Ph. Eur.
[0112] Preferably, the pharmaceutical dosage form according to the
invention is adapted for oral administration. It is also possible,
however, to administer the pharmaceutical dosage form via different
routes and thus, the pharmaceutical dosage form may alternatively
be adapted for buccal, lingual, rectal or vaginal administration.
Implants are also possible.
[0113] In a preferred embodiment, the pharmaceutical dosage form
according to the invention is adapted for administration once
daily. In another preferred embodiment, the pharmaceutical dosage
form according to the invention is adapted for administration twice
daily. In still another preferred embodiment, the pharmaceutical
dosage form according to the invention is adapted for
administration thrice daily.
[0114] For the purpose of the specification, "twice daily" means
equal or nearly equal time intervals, i.e., about every 12 hours,
or different time intervals, e.g., 8 and 16 hours or 10 and 14
hours, between the individual administrations.
[0115] For the purpose of the specification, "thrice daily" means
equal or nearly equal time intervals, i.e., about every 8 hours, or
different time intervals, e.g., 6, 6 and 12 hours; or 7, 7 and 10
hours, between the individual administrations.
[0116] Preferably, the pharmaceutical dosage form according to the
invention causes an at least partially delayed or prolonged release
of opioid (A).
[0117] Controlled or prologned release is understood according to
the invention preferably to mean a release profile in which the
opioid (A) is released over a relatively long period with reduced
intake frequency with the purpose of extended therapeutic action.
Preferably, the meaning of the term "prolonged release" is in
accordance with the European guideline on the nomenclature of the
release profile of pharmaceutical dosage forms (CHMP). This is
achieved in particular with peroral administration. The expression
"at least partially delayed or prolonged release" covers according
to the invention any pharmaceutical dosage forms which ensure
modified release of the opioids (A) contained therein. The
pharmaceutical dosage forms preferably comprise coated or uncoated
pharmaceutical dosage forms, which are produced with specific
auxiliary substances, by particular processes or by a combination
of the two possible options in order purposefully to change the
release rate or location of release.
[0118] In the case of the pharmaceutical dosage forms according to
the invention, the release time profile of a controlled release
form may be modified e.g. as follows: extended release, repeat
action release, prolonged release and sustained release.
[0119] For the purpose of the specification "controlled release"
preferably means a product in which the release of active compound
over time is controlled by the type and composition of the
formulation. For the purpose of the specification "extended
release" preferably means a product in which the release of active
compound is delayed for a finite lag time, after which release is
unhindered. For the purpose of the specification "repeat action
release" preferably means a product in which a first portion of
active compound is released initially, followed by at least one
further portion of active compound being released subsequently. For
the purpose of the specification "prolonged release" preferably
means a product in which the rate of release of active compound
from the formulation after administration has been reduced over
time, in order to maintain therapeutic activity, to reduce toxic
effects, or for some other therapeutic purpose. For the purpose of
the specification "sustained release" preferably means a way of
formulating a medicine so that it is released into the body
steadily, over a long period of time, thus reducing the dosing
frequency. For further details, reference may be made, for example,
to K. H. Bauer, Lehrbuch der Pharmazeutischen Technologie, 6th
edition, WVG Stuttgart, 1999; and Eur. Ph.
[0120] The pharmaceutical dosage form according to the invention
may comprise one or more opioids (A) at least in part in a further
controlled release form, wherein controlled release may be achieved
with the assistance of conventional materials and processes known
to the person skilled in the art, for example by embedding the
substance in a controlled release matrix or by applying one or more
controlled release coatings. Substance release must, however, be
controlled such that addition of delayed-release materials does not
impair the necessary breaking strength. Controlled release from the
pharmaceutical dosage form according to the invention is preferably
achieved by embedding the substance in a matrix. Preferably,
polyalkylene oxide (C) serves as such a matrix. The auxiliary
substances acting as matrix materials control release. Matrix
materials may, for example, be hydrophilic, gel-forming materials,
from which release proceeds mainly by diffusion, or hydrophobic
materials, from which release proceeds mainly by diffusion from the
pores in the matrix.
[0121] Preferably, the release profile is substantially matrix
controlled, preferably by embedding opioid (A) in a matrix
comprising polyalkylene oxide (C) and optionally, further matrix
materials. Preferably, the release profile is not osmotically
driven. Preferably, release kinetics is not zero order.
[0122] Preferably, under physiological conditions the
pharmaceutical dosage form according to the invention has released
after 30 minutes 0.1 to 75%, after 240 minutes 0.5 to 95%, after
480 minutes 1.0 to 100% and after 720 minutes 2.5 to 100% of the
opioid (A). Further preferred release profiles R.sub.1 to R.sub.6
are summarized in the table here below [all data in wt.-% of
released opioid (A)]:
TABLE-US-00009 time R.sub.1 R.sub.2 R.sub.3 R.sub.4 R.sub.5 R.sub.6
60 min 0-30 0-50 0-50 15-25 20-30 20-50 120 min 0-40 0-75 0-75
25-40 35-50 40-75 240 min 3-55 3-95 10-95 40-70 55-75 60-95 480 min
10-65 10-100 35-100 60-90 80-95 80-100 720 min 20-75 20-100 55-100
70-100 90-100 90-100 960 min 30-88 30-100 70-100 >80 95-100 1440
min 50-100 50-100 >90 2160 min >80 >80
[0123] Further preferred release profiles R.sub.1 to R.sub.6 are
summarized in the table here below [all data in wt.-% of released
opioid (A)]:
TABLE-US-00010 time R.sub.7 R.sub.8 R.sub.9 R.sub.10 R.sub.11
R.sub.12 30 min 17.5 .+-. 7.5 17.5 .+-. 6.5 17.5 .+-. 5.5 17.5 .+-.
4.5 17.5 .+-. 3.5 17.5 .+-. 2.5 60 min 27.0 .+-. 8.0 27.0 .+-. 7.0
27.0 .+-. 6.0 27.0 .+-. 5.0 27.0 .+-. 4.0 27.0 .+-. 3.0 120 min
41.5 .+-. 9.5 41.5 .+-. 8.5 41.5 .+-. 7.5 41.5 .+-. 6.5 41.5 .+-.
5.5 41.5 .+-. 4.5 240 min 64.5 .+-. 12.5 64.5 .+-. 11.5 64.5 .+-.
10.5 64.5 .+-. 9.5 64.5 .+-. 8.5 64.5 .+-. 7.5 480 min 88.0 .+-.
12.0 88.0 .+-. 11.0 88.0 .+-. 10.0 88.0 .+-. 9.0 88.0 .+-. 8.0 88.0
.+-. 7.0 720 min 96.0 .+-. 9.0 96.0 .+-. 8.0 96.0 .+-. 7.0 96.0
.+-. 6.0 96.0 .+-. 5.0 96.0 .+-. 4.0 840 min 97.5 .+-. 7.5 97.5
.+-. 6.5 97.5 .+-. 5.5 97.5 .+-. 4.5 97.5 .+-. 3.5 97.5 .+-.
2.5
[0124] Preferably, the release profile of the pharmaceutical dosage
form according to the present invention is stable upon storage,
preferably upon storage at elevated temperature, e.g. 37.degree.
C., for 3 months in sealed containers. In this regard "stable"
means that when comparing the initial release profile with the
release profile after storage, at any given time point the release
profiles deviate from one another by not more than 20%, more
preferably not more than 15%, still more preferably not more than
10%, yet more preferably not more than 7.5%, most preferably not
more than 5.0% and in particular not more than 2.5%.
[0125] Preferably, under in vitro conditions the pharmaceutical
dosage form has released after 0.5 h 1.0 to 35 wt.-%, after 1 h 5.0
to 45 wt.-%, after 2 h 10 to 60 wt.-%, after 4 h at least 15 wt-%,
after 6 h at least 20 wt.-%, after 8 h at least 25 wt.-% and after
12 h at least 30 wt.-% of the opioid (A) that was originally
contained in the pharmaceutical dosage form.
[0126] Suitable in vitro conditions are known to the skilled
artisan. In this regard it can be referred to, e.g., the Eur. Ph.
Preferably, the release profile is measured under the following
conditions: Paddle apparatus equipped with sinker, 50 rpm,
37.+-.5.degree. C., 900 mL simulated intestinal fluid pH 6.8
(phosphate buffer) or pH 4.5. In a preferred embodiment, to
rotational speed of the paddle is increased to 100 rpm.
[0127] In a preferred embodiment, after preferably oral
administration of the pharmaceutical dosage form according to the
invention, in vivo the average peak plasma level (C.sub.max) is on
average reached after t.sub.max 4.0.+-.2.5 h, more preferably after
t.sub.max 4.0.+-.2.0 h, still more preferably after t.sub.max
4.0.+-.1.5 h, most preferably after t.sub.max 4.0.+-.1.0 h and in
particular after t.sub.max 4.0.+-.0.5 h. In another preferred
embodiment, after preferably oral administration of the
pharmaceutical dosage form according to the invention, in vivo the
average peak plasma level (C.sub.max) is on average reached after
t.sub.max 5.0.+-.2.5 h, more preferably after t.sub.max 5.0.+-.2.0
h, still more preferably after t.sub.max 5.0.+-.1.5 h, most
preferably after t.sub.max 5.0.+-.1.0 h and in particular after
t.sub.max 5.0.+-.0.5 h. In still another preferred embodiment,
after preferably oral administration of the pharmaceutical dosage
form according to the invention, in vivo the average peak plasma
level (C.sub.max) is on average reached after t.sub.max 6.0.+-.2.5
h, more preferably after t.sub.max 6.0.+-.2.0 h, still more
preferably after t.sub.max 6.0.+-.1.5 h, most preferably after
t.sub.max 6.0.+-.1.0 h and in particular after t.sub.max 6.0.+-.0.5
h.
[0128] In a preferred embodiment, the average value for t.sub.1/2
after preferably oral administration of the pharmaceutical dosage
form according to the invention in vivo is 4.0.+-.2.5 h, more
preferably 4.0.+-.2.0 h, still more preferably 4.0.+-.1.5 h, most
preferably 4.0.+-.1.0 h, and in particular 4.0.+-.0.5 h. In another
preferred embodiment, the average value for t.sub.1/2 after
preferably oral administration of the pharmaceutical dosage form
according to the invention in vivo is preferably 5.0.+-.2.5 h, more
preferably 5.0.+-.2.0 h, still more preferably 5.0.+-.1.5 h, most
preferably 5.0.+-.1.0 h, and in particular 5.0.+-.0.5 h. In still
another preferred embodiment, the average value for t.sub.1/2 after
preferably oral administration of the pharmaceutical dosage form
according to the invention in vivo is preferably 6.0.+-.2.5 h, more
preferably 6.0.+-.2.0 h, still more preferably 6.0.+-.1.5 h, most
preferably 6.0.+-.1.0 h, and in particular 6.0.+-.0.5 h.
[0129] Preferably, the pharmaceutical dosage form according to the
invention contains a coating, preferably a film-coating. Suitable
coating materials are known to the skilled person. Suitable coating
materials are commercially available, e.g. under the trademarks
Opadry.RTM. and Eudragit.RTM..
[0130] Examples of suitable materials include cellulose esters and
cellulose ethers, such as methyl-cellulose (MC),
hydroxypropylmethylcellulose (HPMC), hydroxypropylcellulose (HPC),
hydroxyethylcellulose (HEC), sodium carboxymethylcellulose
(Na-CMC), ethylcellulose (EC), cellulose acetate phthalate (CAP),
hydroxypropylmethylcellulose phthalate (HPMCP);
poly(meth)acrylates, such as aminoalkylmethacrylate copolymers,
ethylacrylate methyl-methacrylate copolymers, methacrylic acid
methylmethacrylate copolymers, methacrylic acid methylmethacrylate
copolymers; vinyl polymers, such as polyvinylpyrrolidone,
polyvinyl-acetatephthalate, polyvinyl alcohol, polyvinylacetate;
and natural film formers, such as shellack.
[0131] In a particularly preferred embodiment, the coating is
water-soluble. In a preferred embodiment, the coating is based on
polyvinyl alcohol, such as polyvinyl alcohol-part. hydrolyzed, and
may additionally contain polyethylene glycol, such as macrogol
3350, and/or pigments. In another preferred embodiment, the coating
is based on hydroxypropylmethyl-cellulose, preferably hypromellose
type 2910 having a viscosity of 3 to 15 mPas.
[0132] The coating of the pharmaceutical dosage form can increase
its storage stability.
[0133] The coating can be resistant to gastric juices and dissolve
as a function of the pH value of the release environment. By means
of this coating, it is possible to ensure that the pharmaceutical
dosage form according to the invention passes through the stomach
undissolved and the active compound is only released in the
intestines. The coating which is resistant to gastric juices
preferably dissolves at a pH value of between 5 and 7.5.
Corresponding materials and methods for the delayed release of
active compounds and for the application of coatings which are
resistant to gastric juices are known to the person skilled in the
art, for example from "Coated Pharmaceutical dosage
forms--Fundamentals, Manufacturing Techniques, Biopharmaceutical
Aspects, Test Methods and Raw Materials" by Kurt H. Bauer, K.
Lehmann, Hermann P. Osterwald, Rothgang, Gerhart, 1st edition,
1998, Medpharm Scientific Publishers.
[0134] In a preferred embodiment, the pharmaceutical dosage form
according to the invention contains no substances which irritate
the nasal passages and/or pharynx, i.e. substances which, when
administered via the nasal passages and/or pharynx, bring about a
physical reaction which is either so unpleasant for the patient
that he/she does not wish to or cannot continue administration, for
example burning, or physiologically counteracts taking of the
corresponding active compound, for example due to increased nasal
secretion or sneezing. Further examples of substances which
irritate the nasal passages and/or pharynx are those which cause
burning, itching, urge to sneeze, increased formation of secretions
or a combination of at least two of these stimuli. Corresponding
substances and the quantities thereof which are conventionally to
be used are known to the person skilled in the art. Some of the
substances which irritate the nasal passages and/or pharynx are
accordingly based on one or more constituents or one or more plant
parts of a hot substance drug. Corresponding hot substance drugs
are known per se to the person skilled in the art and are
described, for example, in "Pharmazeutische Biologie--Drogen und
ihre Inhaltsstoffe" by Prof. Dr. Hildebert Wagner, 2nd., revised
edition, Gustav Fischer Verlag, Stuttgart-N.Y., 1982, pages 82 et
seq. The corresponding description is hereby introduced as a
reference and is deemed to be part of the disclosure.
[0135] The pharmaceutical dosage form according to the invention
furthermore preferably contains no antagonists for the opioid (A),
preferably no antagonists against psychotropic substances, in
particular no antagonists against opioids (A). Antagonists suitable
for a given opioid (A) are known to the person skilled in the art
and may be present as such or in the form of corresponding
derivatives, in particular esters or ethers, or in each case in the
form of corresponding physiologically acceptable compounds, in
particular in the form of the salts or solvates thereof. The
pharmaceutical dosage form according to the invention preferably
contains no antagonists selected from among the group comprising
naloxone, naltrexone, nalmefene, nalide, nalmexone, nalorphine or
naluphine, in each case optionally in the form of a corresponding
physiologically acceptable compound, in particular in the form of a
base, a salt or solvate; and no neuroleptics, for example a
compound selected from among the group comprising haloperidol,
promethacine, fluphenazine, perphenazine, levomepromazine,
thioridazine, perazine, chlorpromazine, chlorprothixine,
zuclopenthixol, flupentixol, prothipendyl, zotepine, benperidol,
pipamperone, melperone and bromperidol.
[0136] The pharmaceutical dosage form according to the invention
furthermore preferably contains no emetic. Emetics are known to the
person skilled in the art and may be present as such or in the form
of corresponding derivatives, in particular esters or ethers, or in
each case in the form of corresponding physiologically acceptable
compounds, in particular in the form of the salts or solvates
thereof. The pharmaceutical dosage form according to the invention
preferably contains no emetic based on one or more constituents of
ipecacuanha (ipecac) root, for example based on the constituent
emetine, as are, for example, described in "Pharmazeutische
Biologie--Drogen und ihre Inhaltsstoffe" by Prof. Dr. Hildebert
Wagner, 2nd, revised edition, Gustav Fischer Verlag, Stuttgart,
N.Y., 1982. The corresponding literature description is hereby
introduced as a reference and is deemed to be part of the
disclosure. The pharmaceutical dosage form according to the
invention preferably also contains no apomorphine as an emetic.
[0137] Finally, the pharmaceutical dosage form according to the
invention preferably also contains no bitter substance. Bitter
substances and the quantities effective for use may be found in
US-2003/0064099 A1, the corresponding disclosure of which should be
deemed to be the disclosure of the present application and is
hereby introduced as a reference. Examples of bitter substances are
aromatic oils, such as peppermint oil, eucalyptus oil, bitter
almond oil, menthol, fruit aroma substances, aroma substances from
lemons, oranges, limes, grapefruit or mixtures thereof, and/or
denatonium benzoate.
[0138] The pharmaceutical dosage form according to the invention
accordingly preferably contains neither substances which irritate
the nasal passages and/or pharynx, nor antagonists for the opioid
(A), nor emetics, nor bitter substances.
[0139] The pharmaceutical dosage form according to the invention is
preferably adapted for oral administration.
[0140] Typically, the pharmaceutical dosage form according to the
invention assumes the form of a tablet. Preferably, the
pharmaceutical dosage form is neither in film form, nor
multi-particulate.
[0141] The pharmaceutical dosage form according to the invention is
preferably tamper-resistant. Preferably, tamper-resistance is
achieved based on the mechanical properties of the pharmaceutical
dosage form so that comminution is avoided or at least
substantially impeded. According to the invention, the term
comminution means the pulverization of the pharmaceutical dosage
form using conventional means usually available to an abuser, for
example a pestle and mortar, a hammer, a mallet or other
conventional means for pulverizing under the action of force. Thus,
tamper-resistance preferably means that pulverization of the
pharmaceutical dosage form using conventional means is avoided or
at least substantially impeded.
[0142] Preferably, the mechanical properties of the pharmaceutical
dosage form according to the invention, particularly its breaking
strength, substantially rely on the presence and spatial
distribution of polyalkylene oxide (C), although its mere presence
does typically not suffice in order to achieve said properties. The
advantageous mechanical properties of the pharmaceutical dosage
form according to the invention may not automatically be achieved
by simply processing opioid (A), acid (B), polyalkylene oxide (C),
and optionally further excipients by means of conventional methods
for the preparation of pharmaceutical dosage forms. In fact,
usually suitable apparatuses must be selected for the preparation
and critical processing parameters must be adjusted, particularly
pressure/force, temperature and time. Thus, even if conventional
apparatuses are used, the process protocols usually must be adapted
in order to meet the required criteria.
[0143] The pharmaceutical dosage form according to the invention
has a breaking strength of at least 300 N, preferably at least 400
N, more preferably at least 500 N, still more preferably at least
750 N, yet more preferably at least 1000 N, most preferably at
least 1250 N and in particular at least 1500 N.
[0144] The "breaking strength" (resistance to crushing) of a
pharmaceutical dosage form is known to the skilled person. In this
regard it can be referred to, e.g., W. A. Ritschel, Die Tablette,
2. Auflage, Editio Cantor Verlag Aulendorf, 2002; H Liebermann et
al., Pharmaceutical dosage forms: Tablets, Vol. 2, Informa
Healthcare; 2 edition, 1990; and Encyclopedia of Pharmaceutical
Technology, Informa Healthcare; 1 edition.
[0145] For the purpose of the specification, the breaking strength
is preferably defined as the amount of force that is necessary in
order to fracture the pharmaceutical dosage form (=breaking force).
Therefore, for the purpose of the specification the pharmaceutical
dosage form does preferably not exhibit the desired breaking
strength when it breaks, i.e., is fractured into at least two
independent parts that are separated from one another. In another
preferred embodiment, however, the pharmaceutical dosage form is
regarded as being broken if the force decreases by 25% (threshold
value) of the highest force measured during the measurement (see
below).
[0146] The pharmaceutical dosage forms according to the invention
are distinguished from conventional pharmaceutical dosage forms in
that, due to their breaking strength, they cannot be pulverized by
the application of force with conventional means, such as for
example a pestle and mortar, a hammer, a mallet or other usual
means for pulverization, in particular devices developed for this
purpose (tablet crushers). In this regard "pulverization" means
crumbling into small particles that would immediately release the
pharmacologically active compound (A) in a suitable medium.
Avoidance of pulverization virtually rules out oral or parenteral,
in particular intravenous or nasal abuse.
[0147] Conventional tablets typically have a breaking strength well
below 200 N in any direction of extension. The breaking strength of
conventional round tablets may be estimated according to the
following empirical formula: Breaking Strength [in
N]=10.times.Diameter Of The Tablet [in mm]. Thus, according to said
empirical formula, a round tablet having a breaking strength of at
least 300 N would require a diameter of at least 30 mm). Such a
tablet, however, could not be swallowed. The above empirical
formula preferably does not apply to the pharmaceutical dosage
forms of the invention, which are not conventional but rather
special.
[0148] Further, the actual mean chewing force is about 220 N (cf.,
e.g., P. A. Proeschel et al., J Dent Res, 2002, 81(7), 464-468).
This means that conventional tablets having a breaking strength
well below 200 N may be crushed upon spontaneous chewing, whereas
the pharmaceutical dosage forms according to the invention may
not.
[0149] Still further, when applying a gravitational acceleration of
about 9.81 m/s.sup.2, 300 N correspond to a gravitational force of
more than 30 kg, i.e. the pharmaceutical dosage forms according to
the invention can preferably withstand a weight of more than 30 kg
without being pulverised.
[0150] Methods for measuring the breaking strength of a
pharmaceutical dosage form are known to the skilled artisan.
Suitable devices are commercially available.
[0151] For example, the breaking strength (resistance to crushing)
can be measured in accordance with the Eur. Ph. 5.0, 2.9.8 or 6.0,
2.09.08 "Resistance to Crushing of Tablets". The test is intended
to determine, under defined conditions, the resistance to crushing
of tablets, measured by the force needed to disrupt them by
crushing. The apparatus consists of 2 jaws facing each other, one
of which moves towards the other. The flat surfaces of the jaws are
perpendicular to the direction of movement. The crushing surfaces
of the jaws are flat and larger than the zone of contact with the
tablet. The apparatus is calibrated using a system with a precision
of 1 Newton. The tablet is placed between the jaws, taking into
account, where applicable, the shape, the break-mark and the
inscription; for each measurement the tablet is oriented in the
same way with respect to the direction of application of the force
(and the direction of extension in which the breaking strength is
to be measured). The measurement is carried out on 10 tablets,
taking care that all fragments of tablets have been removed before
each determination. The result is expressed as the mean, minimum
and maximum values of the forces measured, all expressed in
Newton.
[0152] A similar description of the breaking strength (breaking
force) can be found in the USP. The breaking strength can
alternatively be measured in accordance with the method described
therein where it is stated that the breaking strength is the force
required to cause a tablet to fail (i.e., break) in a specific
plane. The tablets are generally placed between two platens, one of
which moves to apply sufficient force to the tablet to cause
fracture. For conventional, round (circular cross-section) tablets,
loading occurs across their diameter (sometimes referred to as
diametral loading), and fracture occurs in the plane. The breaking
force of tablets is commonly called hardness in the pharmaceutical
literature; however, the use of this term is misleading. In
material science, the term hardness refers to the resistance of a
surface to penetration or indentation by a small probe. The term
crushing strength is also frequently used to describe the
resistance of tablets to the application of a compressive load.
Although this term describes the true nature of the test more
accurately than does hardness, it implies that tablets are actually
crushed during the test, which is often not the case.
[0153] Alternatively, the breaking strength (resistance to
crushing) can be measured in accordance with WO 2005/ 016313, WO
2005/016314, and WO 2006/082099, which can be regarded as a
modification of the method described in the Eur. Ph. The apparatus
used for the measurement is preferably a "Zwick Z 2.5" materials
tester, F.sub.max=2.5 kN with a maximum draw of 1150 mm, which
should be set up with one column and one spindle, a clearance
behind of 100 mm and a test speed adjustable between 0.1 and 800
mm/min together with testControl software. Measurement is performed
using a pressure piston with screw-in inserts and a cylinder
(diameter 10 mm), a force transducer, F.sub.max. 1 kN, diameter=8
mm, class 0.5 from 10 N, class 1 from 2 N to ISO 7500-1, with
manufacturers test certificate M according to DIN 55350-18 (Zwick
gross force F.sub.max=1.45 kN) (all apparatus from Zwick GmbH &
Co. KG, Ulm, Germany) with Order No BTC-FR 2.5 TH. D09 for the
tester, Order No BTC-LC 0050N. P01 for the force transducer, Order
No BO 70000 S06 for the centring device.
[0154] In a preferred embodiment of the invention, the breaking
strength is measured by means of a breaking strength tester e.g.
Sotax.RTM., type HT100 or type HT1 (Allschwil, Switzerland). Both,
the Sotax.RTM. HT100 and the Sotax.RTM. HT1can measure the breaking
strength according to two different measurement principles:
constant speed (where the test jaw is moved at a constant speed
adjustable from 5-200 mm/min) or constant force (where the test jaw
increases force linearly adjustable from 5-100 N/sec). In
principle, both measurement principles are suitable for measuring
the breaking strength of the pharmaceutical dosage form according
to the invention. Preferably, the breaking strength is measured at
constant speed, preferably at a constant speed of 120 mm/min.
[0155] In a preferred embodiment, the pharmaceutical dosage form is
regarded as being broken if it is fractured into at least two
separate pieces.
[0156] The pharmaceutical dosage form according to the invention
preferably exhibits mechanical strength over a wide temperature
range, in addition to the breaking strength (resistance to
crushing) optionally also sufficient hardness, impact resistance,
impact elasticity, tensile strength and/or modulus of elasticity,
optionally also at low temperatures (e.g. below -24.degree. C.,
below -40.degree. C. or in liquid nitrogen), for it to be virtually
impossible to pulverize by spontaneous chewing, grinding in a
mortar, pounding, etc. Thus, preferably, the comparatively high
breaking strength of the pharmaceutical dosage form according to
the invention is maintained even at low or very low temperatures,
e.g., when the pharmaceutical dosage form is initially chilled to
increase its brittleness, for example to temperatures below
-25.degree. C., below -40.degree. C. or even in liquid
nitrogen.
[0157] The pharmaceutical dosage form according to the invention is
characterized by a certain degree of breaking strength. This does
not mean that the pharmaceutical dosage form must also exhibit a
certain degree of hardness. Hardness and breaking strength are
different physical properties. Therefore, the tamper resistance of
the pharmaceutical dosage form does not necessarily depend on the
hardness of the pharmaceutical dosage form. For instance, due to
its breaking strength, impact strength, elasticity modulus and
tensile strength, respectively, the pharmaceutical dosage form can
preferably be deformed, e.g. plastically, when exerting an external
force, for example using a hammer, but cannot be pulverized, i.e.,
crumbled into a high number of fragments. In other words, the
pharmaceutical dosage form according to the invention is
characterized by a certain degree of breaking strength, but not
necessarily also by a certain degree of form stability.
[0158] Therefore, in the meaning of the specification, a
pharmaceutical dosage form that is deformed when being exposed to a
force in a particular direction of extension but that does not
break (plastic deformation or plastic flow) is preferably to be
regarded as having the desired breaking strength in said direction
of extension.
[0159] A particularly preferred embodiment of the invention relates
to a tamper-resistant pharmaceutical dosage form having a breaking
strength of at least 300 N and being thermoformed by hot-melt
extrusion, said pharmaceutical dosage form comprising [0160] an
opioid (A) selected from the group consisting of oxymorphone,
oxycodone, hydromorphone, and the physiologically acceptable salts
thereof; [0161] a free physiologically acceptable multicarboxylic
acid (B), preferably citric acid, wherein the content of the acid
(B) is within the range of from 0.001 to 5.0 wt.-%, based on the
total weight of the pharmaceutical dosage form; [0162] an
antioxidant, wherein the content of the antioxidant, preferably
.alpha.-tocopherol, is within the range of from 0.001 to 5.0 wt.-%,
based on the total weight of the pharmaceutical dosage form; and
[0163] a polyalkylene oxide (C) having a weight average molecular
weight M.sub.w of at least 200,000 g/mol;
[0164] wherein [0165] the opioid (A) is embedded in a matrix
comprising the polyalkylene oxide (C), said matrix controlling the
release of the opioid (A) from the pharmaceutical dosage form; and
[0166] after storage for 4 weeks at 40.degree. C. and 75% rel.
humidity, the content of opioid (A) amounts to at least 98.0% of
its original content before storage.
[0167] The pharmaceutical dosage form according to the invention
may be produced by different processes, the particularly preferred
of which are explained in greater detail below. Several suitable
processes have already been described in the prior art. In this
regard it can be referred to, e.g., WO 2005/ 016313, WO
2005/016314, WO 2005/063214, WO 2005/102286, WO 2006/002883, WO
2006/002884, WO 2006/002886, WO 2006/082097, and WO
2006/082099.
[0168] The present invention also relates to pharmaceutical dosage
forms that are obtainable by any of the processes described here
below.
[0169] In general, the process for the production of the
pharmaceutical dosage form according to the invention preferably
comprises the following steps: [0170] (a) mixing all ingredients;
[0171] (b) optionally pre-forming the mixture obtained from step
(a), preferably by applying heat and/or force to the mixture
obtained from step (a), the quantity of heat supplied preferably
not being sufficient to heat the polyalkylene oxide (C) up to its
softening point; [0172] (c) hardening the mixture by applying heat
and force, it being possible to supply the heat during and/or
before the application of force and the quantity of heat supplied
being sufficient to heat the polyalkylene oxide (C) at least up to
its softening point; [0173] (d) optionally singulating the hardened
mixture; [0174] (e) optionally shaping the pharmaceutical dosage
form; and [0175] (f) optionally providing a film coating.
[0176] Heat may be supplied directly, e.g. by contact or by means
of hot gas such as hot air, or with the assistance of ultrasound.
Force may be applied and/or the pharmaceutical dosage form may be
shaped for example by direct tabletting or with the assistance of a
suitable extruder, particularly by means of a screw extruder
equipped with two screws (twin-screw-extruder) or by means of a
planetary gear extruder.
[0177] The final shape of the pharmaceutical dosage form may either
be provided during the hardening of the mixture by applying heat
and force (step (c)) or in a subsequent step (step (e)). In both
cases, the mixture of all components is preferably in the
plastified state, i.e. preferably, shaping is performed at a
temperature at least above the softening point of the polyalkylene
oxide (C). However, extrusion at lower temperatures, e.g. ambient
temperature, is also possible and may be preferred.
[0178] Shaping can be performed, e.g., by means of a tabletting
press comprising die and punches of appropriate shape.
[0179] A particularly preferred process for the manufacture of the
pharmaceutical dosage form of the invention involves hot-melt
extrusion. In this process, the pharmaceutical dosage form
according to the invention is produced by thermoforming with the
assistance of an extruder, preferably without there being any
observable consequent discoloration of the extrudate. It has been
surprisingly found that acid (B) is capable of suppressing
discoloration. In the absence of acid (B), the extrudate tends to
develop beige to yellowish coloring whereas in the presence of acid
(B) the extrudates are substantially colorless, i.e. white.
[0180] This process is characterized in that [0181] a) all
components are mixed, [0182] b) the resultant mixture is heated in
the extruder at least up to the softening point of the polyalkylene
oxide (C) and extruded through the outlet orifice of the extruder
by application of force, [0183] c) the still plastic extrudate is
singulated and formed into the pharmaceutical dosage form or [0184]
d) the cooled and optionally reheated singulated extrudate is
formed into the pharmaceutical dosage form.
[0185] Mixing of the components according to process step a) may
also proceed in the extruder.
[0186] The components may also be mixed in a mixer known to the
person skilled in the art. The mixer may, for example, be a roll
mixer, shaking mixer, shear mixer or compulsory mixer.
[0187] Before blending with the remaining components, polyalkylene
oxide (C) is preferably provided according to the invention with an
antioxidant, preferably .alpha.-tocopherol. This may proceed by
mixing the two components, the polyalkylene oxide (C) and the
antioxidant, preferably by dissolving or suspending the antioxidant
in a highly volatile solvent and homogeneously mixing this solution
or suspension with polyalkylene oxide (C) and removing the solvent
by drying, preferably under an inert gas atmosphere.
[0188] The, preferably molten, mixture which has been heated in the
extruder at least up to the softening point of polyalkylene oxide
(C) is extruded from the extruder through a die with at least one
bore.
[0189] The process according to the invention requires the use of
suitable extruders, preferably screw extruders. Screw extruders
which are equipped with two screws (twin-screw-extruders) are
particularly preferred.
[0190] The extrusion is preferably performed so that the expansion
of the strand due to extrusion is not more than 30%, i.e. that when
using a die with a bore having a diameter of e.g. 6 mm, the
extruded strand should have a diameter of not more than 8 mm. More
preferably, the expansion of the strand is not more than 25%, still
more preferably not more than 20%, most preferably not more than
15% and in particular not more than 10%.
[0191] Preferably, extrusion is performed in the absence of water,
i.e., no water is added. However, traces of water (e.g., caused by
atmospheric humidity) may be present.
[0192] The extruder preferably comprises at least two temperature
zones, with heating of the mixture at least up to the softening
point of the polyalkylene oxide (C) proceeding in the first zone,
which is downstream from a feed zone and optionally mixing zone.
The throughput of the mixture is preferably from 1.0 kg to 15
kg/hour. In a preferred embodiment, the throughput is from 1 to 3.5
kg/hour. In another preferred embodiment, the throughput is from 4
to 15 kg/hour.
[0193] In a preferred embodiment, the die head pressure is within
the range of from 25 to 100 bar. The die head pressure can be
adjusted inter alia by die geometry, temperature profile and
extrusion speed.
[0194] The die geometry or the geometry of the bores is freely
selectable. The die or the bores may accordingly exhibit a round,
oblong or oval cross-section, wherein the round cross-section
preferably has a diameter of 0.1 mm to 15 mm and the oblong
cross-section preferably has a maximum lengthwise extension of 21
mm and a crosswise extension of 10 mm. Preferably, the die or the
bores have a round cross-section. The casing of the extruder used
according to the invention may be heated or cooled. The
corresponding temperature control, i.e. heating or cooling, is so
arranged that the mixture to be extruded exhibits at least an
average temperature (product temperature) corresponding to the
softening temperature of the polyalkylene oxide (C) and does not
rise above a temperature at which the opioid (A) to be processed
may be damaged. Preferably, the temperature of the mixture to be
extruded is adjusted to below 180.degree. C., preferably below
150.degree. C., but at least to the softening temperature of
polyalkylene oxide (C). Typical extrusion temperatures are
120.degree. C. and 130.degree. C.
[0195] In a preferred embodiment, the extruder torque is within the
range of from 30 to 95%. Extruder torque can be adjusted inter alia
by die geometry, temperature profile and extrusion speed.
[0196] After extrusion of the molten mixture and optional cooling
of the extruded strand or extruded strands, the extrudates are
preferably singulated. This singulation may preferably be performed
by cutting up the extrudates by means of revolving or rotating
knives, water jet cutters, wires, blades or with the assistance of
laser cutters.
[0197] Preferably, intermediate or final storage of the optionally
singulated extrudate or the final shape of the pharmaceutical
dosage form according to the invention is performed under
oxygen-free atmosphere which may be achieved, e.g., by means of
oxygen-scavengers.
[0198] The singulated extrudate may be press-formed into tablets in
order to impart the final shape to the pharmaceutical dosage
form.
[0199] The application of force in the extruder onto the at least
plasticized mixture is adjusted by controlling the rotational speed
of the conveying device in the extruder and the geometry thereof
and by dimensioning the outlet orifice in such a manner that the
pressure necessary for extruding the plasticized mixture is built
up in the extruder, preferably immediately prior to extrusion. The
extrusion parameters which, for each particular composition, are
necessary to give rise to a pharmaceutical dosage form with desired
mechanical properties, may be established by simple preliminary
testing.
[0200] For example but not limiting, extrusion may be performed by
means of a twin-screw-extruder type ZSE 18 or ZSE27 (Leistritz,
Nurnberg, Germany), screw diameters of 18 or 27 mm. Screws having
eccentric ends may be used. A heatable die with a round bore having
a diameter of 7, 8, or 9 mm may be used. The extrusion parameters
may be adjusted e.g. to the following values: rotational speed of
the screws: 120 Upm; delivery rate 2 kg/h for a ZSE 18 or 8 kg/h
for a ZSE27; product temperature: in front of die 125.degree. C.
and behind die 135.degree. C.; and jacket temperature: 110.degree.
C.
[0201] Preferably, extrusion is performed by means of
twin-screw-extruders or planetary-gear-extruders, twin-screw
extruders (co-rotating or contra-rotating) being particularly
preferred.
[0202] The pharmaceutical dosage form according to the invention is
preferably produced by thermoforming with the assistance of an
extruder without any observable consequent discoloration of the
extrudates.
[0203] The process for the preparation of the pharmaceutical dosage
form according to the invention is preferably performed
continuously. Preferably, the process involves the extrusion of a
homogeneous mixture of all components. It is particularly
advantageous if the thus obtained intermediate, e.g. the strand
obtained by extrusion, exhibits uniform properties. Particularly
desirable are uniform density, uniform distribution of the active
compound, uniform mechanical properties, uniform porosity, uniform
appearance of the surface, etc. Only under these circumstances the
uniformity of the pharmacological properties, such as the stability
of the release profile, may be ensured and the amount of rejects
can be kept low.
[0204] A further aspect of the invention relates to a packaging
containing a pharmaceutical dosage form according to the invention
and an oxygen scavenger. Suitable packages include blister packages
and bottles, such as glass bottles or bottles made from
thermoplastic polymers.
[0205] Suitable oxygen scavengers are known to the skilled artisan.
The oxygen scavenger can be any scavenger known in the art to
scavenge oxygen. Both organic and inorganic oxygen scavengers can
be used.
[0206] In one embodiment, the oxygen scavenger is any metal complex
exhibiting oxygen scavenging activity. Examples include complexes
containing one or more of aluminum, aluminum ferrosilicon,
antimony, beryllium, calcium silicon, cerium, cobalt, gallium,
hafnium, iron, magnesium alloy, nickel catalyst, selenium, silicon,
silver, strontium, titanium, zinc, and/or zirconium.
[0207] In yet another embodiment, one or more elements from Group
IA of the periodic table and their alloys and compounds may be used
as oxygen scavengers. Examples of Group IA elements include cesium,
lithium, potassium, sodium. Further examples of inorganic oxygen
scavengers include one or more of sodium azide (NaN.sub.3), sodium
sulfite (Na.sub.2SO.sub.3), hydrazine, and hydroxylamine.
[0208] In one embodiment, the oxygen scavenger is an organic
compound. Examples include one or more of the polyterpenes,
ascorbic acid, amino polycarboxylic acid, cyclohexanedione,
tetramethyl piperidone, and heterocyclic compounds with
N-substituted amino groups.
[0209] Oxygen scavengers and the application thereof in
pharmaceutical packaging are known to the skilled artisan. In a
preferred embodiment, the oxygen scavenger is selected from the
group consisting of metal-catalyzed oxidizable organic polymers and
anti-oxidants. Particularly preferred are those oxygen scavengers
that are able to perform in a dry environment of below 60% relative
humidity, preferably below 30% relative humidity and that are
combined with a dessicant. Examples of commercially available
oxygen scavengers satisfying these requirements include
Pharmakeep.RTM. KD10 and KD20.
[0210] It has been surprisingly found that the storage stability of
the pharmaceutical dosage form can be increased when keeping the
oxygen content of the atmosphere within the packaging low. Methods
for packaging pharmaceutical dosage forms and the application of
suitable oxygen scavengers are known to the skilled artisan. In
this regard it can be referred to e.g. D. A. Dean, Pharmaceutical
Packaging Technology, Taylor & Francis, 1st ed.; F. A. Paine et
al., Packaging Pharmaceutical and Healthcare Products, Springer,
1st ed.; and O. G. Piringer et al., Plastic Packaging: Interactions
with Food and Pharmaceuticals, Wiley-VCH, 2nd ed.
[0211] As far as the packaging is concerned, round bottles made
from polyolefins, preferably from
[0212] HDPE, are preferred. The thickness of the bottle wall is
preferably at least 0.25 mm, more preferably at least 0.5 mm,
otherwise the bottle may collapse.
[0213] As far as the lid of the packaging is concerned, the
packaging is preferably induction or heat-sealed with an aluminium
foil.
[0214] It has been surprisingly found that by selecting an
appropriate shape of the packaging and sealing, the vacuum that is
produced by the effect of the oxygen scavenger (underpressure of
about 20,000 Pa=2 N/cm.sup.2) can be handled without causing a
collapse of the packaging. Induction sealing (e.g. 3 seconds
energy) is preferred. When sealing a 75 ml bottle having an opening
with a diameter of 1 inch with aluminium foil, an underpressure of
20,000 Pa due to oxygen scavenging results in a force of about 10 N
corresponding to the force that is exerted by a weight of 1 kg.
[0215] The mechanical stability of the sealing can be tested either
by introducing an appropriate amount of oxygen scavenger in the
bottle, sealing it and waiting for a sufficient period of time,
e.g. 2 days, so that the oxygen is scavenged and an underpressure
of about 20,000 has been developed. Alternatively, the bottle may
be sealed without any oxygen scavenger in its interior and a weight
of 1 kg can be placed on the aluminium foil externally thus,
simulating the force.
[0216] A further aspect of the invention relates to the use of an
opioid (A) for the manufacture of the pharmaceutical dosage form as
described above for the treatment of pain.
[0217] A further aspect of the invention relates to the use of a
pharmaceutical dosage form as described above for avoiding or
hindering the abuse of the opioid (A) contained therein.
[0218] A further aspect of the invention relates to the use of a
pharmaceutical dosage form as described above for avoiding or
hindering the unintentional overdose of the opioid (A) contained
therein.
[0219] In this regard, the invention also relates to the use of a
opioid (A) as described above and/or a polyalkylene oxide (C) as
described above for the manufacture of the pharmaceutical dosage
form according to the invention for the prophylaxis and/or the
treatment of a disorder, thereby preventing an overdose of the
opioid (A), particularly due to comminution of the pharmaceutical
dosage form by mechanical action.
[0220] Further, the invention relates to a method for the
prophylaxis and/or the treatment of a disorder comprising the
administration of the pharmaceutical dosage form according to the
invention, thereby preventing an overdose of the opioid (A),
particularly due to comminution of the pharmaceutical dosage form
by mechanical action. Preferably, the mechanical action is selected
from the group consisting of chewing, grinding in a mortar,
pounding, and using apparatuses for pulverizing conventional
pharmaceutical dosage forms.
[0221] The following examples further illustrate the invention but
are not to be construed as limiting its scope.
EXAMPLE 1
[0222] Tablets were prepared by hot-melt extrusion of various
homogeneous constituent mixtures under the following, identical
extrusion conditions: [0223] extruder type: Leistritz Extruder
ZSE18PH 40D equipped with high shear screws and a die of 9 mm
diameter [0224] throughput: 1.0 kg/h [0225] revolution velocity:
100 rpm [0226] barrel temperature: 100.degree. C. [0227] extrudate
temperature: 120.degree. C.
[0228] The extrudate was cut into slices of 325 mg containing about
5 mg oxymorphone hydrochloride.
[0229] The individual constituents of the extruded mixtures as well
as the total amount of decomposition products before and after
storage under accelerated storage conditions are summarized in the
table here below:
TABLE-US-00011 further constituents (wt.-%) ingredient
decomposition products (wt.-%) ex. (A) PEO PEG HPMC .alpha.-toc.
(wt.-%) oNo.sup.1 oNo.sup.2 .SIGMA..sup.1 .SIGMA..sup.2 A.sub.1 1.5
76.9 10.0 10.0 1.5 / 0.06 0.58 0.41 1.93 A.sub.2 1.5 77.5 10.0 10.0
1.0 / 0.09 0.49 0.58 1.81 A.sub.3 1.5 78.0 10.0 10.0 0.5 / 0.08
0.36 0.56 1.64 A.sub.4 1.5 78.3 10.0 10.0 0.2 / 0.08 0.26 0.63 1.51
A.sub.5 1.5 78.5 10.0 10.0 0.0 / 0.07 0.17 0.81 1.69 B.sub.1 1.5
76.9 10.0 10.0 1.5 / 0.06 0.58 0.41 1.93 B.sub.2 1.5 40.0 10.0 46.9
1.5 / 0.09 0.55 0.64 1.76 B.sub.3 1.5 50.0 10.0 36.9 1.5 / 0.00
0.52 0.29 1.64 B.sub.4 1.5 50.0 36.9 10.0 1.5 / 0.11 0.76 0.36 1.74
C.sub.1 1.5 76.9 10.0 10.0 1.5 / 0.06 0.58 0.41 1.93 C.sub.2 1.5
76.9 / 10.0 1.5 10.00 Lutrol .RTM. F68 0.05 0.53 0.65 1.83 C.sub.3
1.5 50.0 10.0 10.0 1.5 26.90 mannitol 0.08 0.82 0.39 2.72 C.sub.4
1.5 76.9 / 10.0 1.5 10.00 carnaubawax 0.12 0.53 0.39 1.03 D.sub.1
1.5 76.9 10.0 10.0 1.5 / 0.06 0.58 0.41 1.93 D.sub.2 1.5 76.8 10.0
10.0 1.5 0.10 fumaric acid 0.05 0.48 0.52 1.70 D.sub.3 1.5 76.8
10.0 10.0 1.5 0.10 Na-EDTA 0.07 0.51 0.48 1.77 D.sub.4 1.5 76.8
10.0 10.0 1.5 0.10 citric acid 0.07 0.48 0.37 1.45 E.sub.1 1.5 76.9
10.0 10.0 1.5 / 0.06 0.58 0.41 1.93 E.sub.2 1.5 76.8 10.0 10.0 1.5
0.10 citric acid 0.07 0.48 0.37 1.45 E.sub.3 1.5 76.7 10.0 10.0 1.5
0.20 citric acid 0.00 0.40 0.20 1.13 E.sub.4 1.5 76.4 10.0 10.0 1.5
0.50 citric acid 0.00 0.06 0.12 0.17 (A): oxymorphone hydrochloride
PEO: polyethylene oxide M.sub.w 7 mio g/mol PEG: polyethylene
glycol 6000 HPMC: hypromellose 100,000 Pa*s .alpha.-toc.:
.alpha.-tocopherol oNo: oxymorphone-N-oxide (mixture) .SIGMA.: sum
of all impurities .sup.1after extrusion, before storage .sup.2after
storage, amber glass bottles, plastic cap, 4 weeks, 40.degree. C.,
75% rel. humidity
[0230] The decomposition products were analyzed by HPLC-UV. The
elution peak for oxymor-phone-N-oxide could not be sufficiently
base-line separated from a peak of an unknown degradation product
(called "UK 0.83"). Thus, both peaks were jointly integrated. It
becomes evident from a comparison of examples A.sub.1 to A.sub.5
that the content of oxymorphone-N-oxide before storage (oNo.sup.1)
is not substantially changed when the content of antioxidant
.alpha.-tocopherol is decreased from 1.5 wt.-% to 1.0 wt.-%, 0.5
wt.-%, 0.2 wt.-% and even 0 wt.-%. Upon storage (oNo.sup.2),
however, the content of oxymorphone-N-oxide is proportional to the
content of .alpha.-tocopherol. This is most surprising because
oxymorphone-N-oxide is an oxidation product and one would expect
that antioxidants usually rather suppress than support the
formation of oxidation products.
[0231] Nonetheless, the complete omission of antioxidant
(.alpha.-tocopherol) has disadvantages. It could be shown by
viscosity measurements that the high molecular polyethylene oxide
is degraded upon extrusion and/or storage in the absence of
antioxidant. It has been surprisingly found that about 0.2 wt.-%
.alpha.-tocopherol suffice in order to stabilize the polyethylene
oxide; higher contents of .alpha.-tocopherol do not result in
higher viscosities of the polyalkylene oxide and, thus, do not
prevent PEO more pronounced from degradation. Thus, the content of
antioxidant (.alpha.-tocopherol) is preferably balanced so that on
the one side, the high molecular weight polyethylene oxide is
sufficiently stabilized and that on the other side, the undesired
formation of oxymorphone-N-oxide is kept low during storage.
[0232] Further, it becomes evident from a comparison of examples
B.sub.1 to B.sub.4 and examples C.sub.1 to C.sub.4 that the partial
replacement of the high molecular weight polyethylene oxide or the
total replacement of the polyethylene glycol by an alternative
plasticizer does not result in a substantial decrease of the
content of undesired oxymorphone-N-oxide. This is surprising
because one would expect that polyethylene oxide and polyethylene
glycol are potential peroxide carriers and that a reduction thereof
would result in a reduction of oxidative processes such as the
oxidation of oxymorphone to oxymorphone-N-oxide.
[0233] Still further, it becomes evident from a comparison of
examples D.sub.1 to D.sub.5 and E.sub.1 to E.sub.4 that the
addition of physiologically acceptable acids, particularly citric
acid, leads to a reduction of the formation of oxymorphone-N-oxide.
This effect is more pronounced when the amount of acid is
increased. At a concentration of 0.1 wt.-%, the effect is
comparatively weak, but at a concentration of 0.2 wt.-% the effect
is stronger and is further enhanced when the concentration of
citric acid is increased. Not only the amount of
oxymorphone-N-oxide is decreased, but also the total amount of
decomposition products, particularly of those having high HPLC
retention times.
EXAMPLE 2
[0234] Tablets that had been manufactured in analogy to ex.
A.sub.1, B.sub.1, C.sub.1, D.sub.1 and E.sub.1 above were packaged
in different packaging materials and stored at 40.degree. C. and
75% rel. humidity. The decomposition products before and after
storage under accelerated storage conditions are summarized in the
table here below:
TABLE-US-00012 closed HDPE, sealed closed amber glass + closed
amber closed amber before with aluminium foil open amber glass
oxygen scavenger glass + desiccant glass + argon storage 4 weeks 8
weeks 4 weeks 8 weeks 4 weeks 8 weeks 4 weeks 8 weeks 4 weeks 8
weeks 323.64 mg 324.05 mg 325.57 mg 323.56 mg 337.25 mg 325.23 mg
322.65 mg 321.27 mg 322.69 mg 324.62 mg 324.30 mg content 96.30%
92.90% 89.40% 93.70% 88.50% 96.70% 94.80% 94.60% 92.50% 94.60%
92.50% oxymorphone purity 99.18% 97.70% 96.70% 98.03% 94.50% 99.10%
98.62% 98.59% 97.98% 98.36% 98.04% oxymorphone content 91.69%
91.51% 90.89% 93.51% 79.94% 94.52% 93.62% 90.56% 88.23% 93.51%
92.18% .alpha.-tocopherol oxymor- 0.09% 0.64% 1.16% 0.19% 0.53%
0.03% 0.04% 0.15% 0.24% 0.17% 0.30% phone-N-oxide UK 0.83 0.00%
0.00% 0.00% 0.36% 2.15% 0.06% 0.08% 0.32% 0.77% 0.00% 0.00% Sum of
oxymor- 0.09% 0.64% 1.16% 0.55% 2.63% 0.09% 0.12% 0.37% 1.01% 0.17%
0.30% phone-N- oxide and UK 0.83 main unknown 0.13% 0.38% 0.43%
0.45% 2.15% 0.16% 0.18% 0.32% 0.77% 0.46% 0.34% Sum of 0.73% 2.22%
3.21% 1.88% 5.44% 0.82% 0.95% 1.33% 1.94% 1.55% 1.88% impurities
.SIGMA. HDPE bottles had a volume of 75 ml. The oxygen scavenger
was Pharmakeep .RTM. KD20 (Mitsubishi, Japan).
[0235] It has been surprisingly found that inclusion of an oxygen
scavenger in the packaging results in a further stabilization of
the dosage form so that the formation of decomposition products is
limited to extremely low values.
EXAMPLE 3
[0236] Tablets were manufactured as described in example 1, packed
into HDPE bottles of 75 ml volume together with an oxygen scavenger
combined with a desiccant (Pharmakeep 20 KD), closed with a plastic
cap with induction seal.
[0237] The individual constituents of the extruded mixtures, the
total amount of decomposition products before and after storage
under accelerated storage conditions are summarized in the table
here below:
TABLE-US-00013 constituents (wt.-%) decomposition products (wt.-%)
ex. (A) PEO PEG HPMC .alpha.-toc. Citric acid oNo.sup.1 oNo.sup.2
oNo.sup.3 .SIGMA..sup.1 .SIGMA..sup.2 .SIGMA..sup.3 F.sub.1 1.5
73.8 10.0 14.0 0.2 0.5 nd nd nd nd nd 0.05 F.sub.2 1.5 77.8 10.0
10.0 0.2 0.5 nd nd nd nd 0.05 0.10 (A): oxymorphone hydrochloride
PEO: polyethylene oxide M.sub.w 7 mio g/mol PEG: polyethylene
glycol 6000 HPMC: hypromellose 100,000 Pa*s .alpha.-toc.:
.alpha.-tocopherol oNo: oxymorphone-N-oxide (mixture) .SIGMA.: sum
of all impurities .sup.1after extrusion, before storage .sup.2after
storage, HDPE bottles, plastic cap with induction seal, oxygen
scavenger, 4 weeks, 40.degree. C., 75% rel. humidity .sup.3after
storage, HDPE bottles, plastic cap with induction seal, oxygen
scavenger, 8 weeks, 40.degree. C., 75% rel. humidity
[0238] The results reveal that the purity of the product is very
high after manufacturing and that the product exhibit stable during
8 weeks storage under accelerated conditions of 40.degree. C./75%
rel. humidity.
EXAMPLE 4
[0239] Tablets were manufactured as described in example 1 but cut
into slices of 215 mg representing 5 mg or 40 mg of oxymorphone
HCl, after forming the tablets were coated with about 6.5 mg each
of a conventional Opadry II film-coat containing polyvinylalcohol
as the film forming excipient, packed into HDPE bottles of 75 ml
volume together with an oxygen scavenger combined with a desiccant
(Pharmakeep 20 KD), closed with a plastic cap with induction
seal.
[0240] The individual constituents of the extruded mixtures, the
total amount of decomposition products before and after storage
under accelerated storage conditions are summarized in the table
here below:
TABLE-US-00014 constituents (wt.-%) decomposition products (wt.-%)
ex. (A) PEO PEG HPMC .alpha.-toc. Citric acid oNo.sup.1 oNo.sup.2
.SIGMA..sup.1 .SIGMA..sup.2 G.sub.1 2.33 70.0 16.63 10.0 0.2 0.84
nd nd nd nd G.sub.2 18.6 56.8 13.56 10.0 0.2 0.84 nd nd 0.05 0.05
(A): oxymorphone hydrochloride PEO: polyethylene oxide M.sub.w 7
mio g/mol PEG: polyethylene glycol 6000 HPMC: hypromellose 100,000
Pa*s .alpha.-toc.: .alpha.-tocopherol oNo: oxymorphone-N-oxide
(mixture) .SIGMA.: sum of all impurities .sup.1after extrusion,
before storage .sup.2after storage, HDPE bottles, plastic cap with
induction seal, oxygen scavenger, 1 month, 40.degree. C., 75% rel.
humidity
EXAMPLE 5
[0241] The most preferred dosage form according to example 3 is
also suitable for the stabilization of oxycodone. This could be
demonstrated for a formulation containing 80 mg of oxycodone HCl
manufactured analogue to example 1 but, the extrudate was cut into
slices of 400 mg:
TABLE-US-00015 constituents (wt.-%) decomposition products (wt.-%)
ex. (A) PEO PEG HPMC .alpha.-toc. Citric acid oNo.sup.1 oNo.sup.2
.SIGMA..sup.1 .SIGMA..sup.2 H.sub.1 20 54.3 15 10 0.2 0.5 0.06 0.07
0.22 0.13 (A): oxycodone PEO: polyethylene oxide M.sub.w 7 mio
g/mol PEG: polyethylene glycol 6000 HPMC: hypromellose 100,000 Pa*s
.alpha.-toc.: .alpha.-tocopherol oNo: oxycodone-N-oxide (Impurity D
+ E) .sup.1after extrusion, before storage .sup.2after storage,
amber glass bottles, plastic cap, oxygen scavenger with desiccant
(Pharmakeep 20KD) 1 month, 40.degree. C., 75% rel. humidity
EXAMPLE 6
[0242] In a single dose (40 mg oxymorphone HCl, tablets of example
4), randomized, three-way crossover study with 1 week between
treatments subjects were fasted overnight and meals were served 4
and 10 hours after dosing. No water was given within.+-.1 hour of
dosing. All tablets were taken with 240 mL of water (example
T).
[0243] PK samples were taken for oxymorphone and 6-OH-oxymorphone
predose and up through 48 hours after dosing.
[0244] Bioequivalence was compared to Opana ER.RTM. (reference
R).
[0245] The results are summarized in the tables here below:
TABLE-US-00016 Treatment Mean SD CV C.sub.max [pg/mL] T 2147 989
46% R 2671 1163 44% AUCT [pg*h/mL] T 38695 13836 36% R 38171 14652
38% AUC [pg*h/mL] T 42575 15836 37% R 41296 15242 37%
TABLE-US-00017 Point Estimate Lower Limit Upper Limit T/R 90% CI
90% CI C.sub.max 79.37 71.69 87.87 AUCT 101.98 95.17 109.29 AUC
102.24 95.48 109.48 CI = confidence interval
[0246] It becomes evident that the dosage forms according to the
invention having an increased breaking strength are bioequivalent
to conventional dosage forms (Opana ER.RTM.).
EXAMPLE 7
[0247] Tablets were prepared under identical conditions by hot-melt
extrusion of two homogeneous constituent mixtures I.sub.1 and
I.sub.2:
TABLE-US-00018 I.sub.1 I.sub.2 Oxymorphone HCl [%] 11.1 11.1 PEO
[%] 68.2 63.2 PEG [%] 10.0 15.0 HPMC Shin Etsu [%] 10.0 10.0
.alpha.-tocopherol [%] 0.2 0.2 Citric acid, anhydrous [%] 0.5 0.5
Tablet weight [mg] 360 360 PEO:PEG 6.82:1 4.21:1
under the following, identical extrusion conditions: [0248]
extruder type: Leistritz Extruder type Micro 27 GL 40 D equipped
with medium shear screws and a die of 8 mm diameter throughput: 10
kg/h [0249] revolution velocity: 120 rpm [0250] manufacturing time:
30 min [0251] temperature of hottest heating zone: 100.degree. C.
[0252] die temperature: 130.degree. C.
[0253] The extrudate was cut into slices of 360 mg containing about
40 mg oxymorphone hydrochloride.
[0254] 100 slices were weighed individually and the standard
deviation of weight was calculated.
[0255] Slices of composition I.sub.1 (PEO:PEG=6.82:1) showed a
standard deviation of 2.3%, whereas slices of composition I.sub.2
(PEO:PEG=4.21:1) showed a standard deviation of 1.6% only.
[0256] It becomes evident from these comparative tests that
surprisingly, the processability of the extruded mass can be
improved by adjusting the ratio of PEO to PEG.
EXAMPLE 8
[0257] In order to investigate if also multicarboxylic acids other
than citric acid could hamper the formation of oxymorphone-N-oxide,
tablets containing maleinic acid or fumaric acid were manufactured
as described in example 1. For comparison, also tablets containing
the inorganic salt NaH.sub.2PO.sub.4 were manufactured. The samples
were stored in open dishes at 40.degree. C. and 75% relative
humidity for 4 weeks.
[0258] The individual constituents of the extruded mixtures as well
as the total amount of decomposition products before and after
storage under accelerated storage conditions are summarized in the
table here below:
TABLE-US-00019 constituents (wt.-%) further decomposition products
(wt-%) ex. (A) PEO PEG HPMC .alpha.-toc. ingredient (wt.-%)
oNo.sup.1 oNo.sup.2 .SIGMA..sup.1 .SIGMA..sup.2 J.sub.1 1.5 76.0
10.0 10.0 1.5 Maleinic acid 1.0% nd nd 0.20 0.22 J.sub.2 1.5 76.0
10.0 10.0 1.5 Fumaric acid 1.0% nd nd 0.17 0.30 J.sub.3 1.5 76.0
10.0 10.0 1.5 NaH.sub.2PO.sub.4 1.0%* nd 0.18 0.06 0.75 (A):
oxymorphone hydrochloride PEO: polyethylene oxide M.sub.w 7 mio
g/mol PEG: polyethylene glycol 6000 HPMC : hypromellose 100,000
Pa*s .alpha.-toc.: .alpha.-tocopherol *NaH.sub.2PO.sub.4: Used in
form of 1.3% of the di-hydrate oNo: oxymorphone-N-oxide (mixture)
.SIGMA.: sum of all impurities; maleinic acid, fumaric acid and
related compounds subtracted from sum of impurities .sup.1after
extrusion, before storage .sup.2after storage, open dish, 4 weeks,
40.degree. C., 75% rel. humidity
[0259] In case of maleinic and fumaric acid these compounds and for
maleinic acid another related compound were detected during the
purity tests as impurities (up to about 40%). Their values have
been subtracted from the sum of impurities
[0260] It becomes evident from a comparison of examples J.sub.1 and
J.sub.2 to A.sub.1 and B.sub.1 that the presence of maleinic and
fumaric acid protected oxymorphone totally against oxidation to
N-oxide and to a large extent against other degradation although
the samples were stored in open dishes and not in closed bottles.
These results are comparable to those obtained with citric acid
(example 1, D.sub.4 and E.sub.2-E.sub.4). Samples containing
NaH.sub.2PO.sub.4 (J.sub.3) exhibited protection against N-oxide
formation and other degradation when compared to the formulations
without any acidic compound (A.sub.1 and B.sub.1) but to a less
extent than the multicarboxylic acids like citric, maleinic and
fumaric acid.
EXAMPLE 9
[0261] In order to investigate if the presence of citric acid also
protects oxidation sensitive opioids other than oxymorphone against
N-oxidation, tablets containing oxycodone hydrochloride were
manufactured as described in example 1.
[0262] For comparison, also tablets containing smaller amounts of
.alpha.-tocopherol were manufactured. The samples were stored in
open dishes at 40.degree. C. and 75% relative humidity for 4
weeks.
[0263] The individual constituents of the extruded mixtures as well
as the total amount of decomposition products before and after
storage under accelerated storage conditions are summarized in the
table here below:
TABLE-US-00020 constituents (wt.-%) further decomposition products
(wt.-%) ex. (A) PEO PEG HPMC .alpha.-toc. ingredient (wt.-%)
oNo.sup.1 oNo.sup.2 .SIGMA..sup.1 .SIGMA..sup.2 K.sub.1 1.5 77.0
10.0 10.0 1.5 / 0.05 0.58 0.31 1.63 K.sub.2 1.5 78.3 10.0 10.0 0.2
/ 0.05 0.28 0.58 0.69 K.sub.3 1.5 76.0 10.0 10.0 1.5 Citric acid
1.0 nd nd 0.19 0.22 K.sub.4 1.5 77.3 10.0 10.0 0.2 Citric acid 1.0
nd nd 0.18 0.23 (A): oxycodone hydrochloride PEO: polyethylene
oxide M.sub.w 7 mio g/mol PEG: polyethylene glycol 6000 HPMC:
hypromellose 100,000 Pa*s .alpha.-toc.: .alpha.-tocopherol oNo:
oxycodone-N-oxide .SIGMA.: sum of all impurities .sup.1after
extrusion, before storage .sup.2after storage, open dish, 4 weeks,
40.degree. C., 75% rel. humidity
[0264] These results show that citric acid protected oxycodone
totally against oxidation to the N-oxide and to a large extent
against other degradation although the samples were stored in open
dishes rather than in closed bottles. Reducing the amount of
.alpha.-tocopherol resulted in reduced degradation, when
formulations were employed not containing citric acid. These
results are comparable to those obtained with oxymorphone.
* * * * *