Morphine polymer release system
First Claim
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1. A pharmaceutical composition for controlled release of at least one therapeutically, prophylactically and/or diagnostically active substance into an aqueous medium by erosion of at least one surface of the composition, the composition comprising:
- a matrix composition comprising;
a) one or more polyglycol homopolymers having an average molecular weight of from at least about 100,000 daltons to about 700,000 daltons,b) an opiod active substance, and, optionally,c) one or more pharmaceutically acceptable excipients,with the proviso that the matrix composition does not contain a water dispersible or water soluble surface active agent that has at least one domain which is compatible with the polymer in the matrix composition and at least one other domain which is lipophilic, and which has a melting point that is lower than the polymer in the matrix,the matrix having a coating having at least one opening exposing at least one surface of said matrix, the coating being insoluble in and impermeable to body fluids and comprising a polymer, wherein any matrix surface exposed to the aqueous medium erodes at a substantially constant rate, so that a zero order release is obtained of at least about 60% w/w of the active substance from the pharmaceutical composition when subject to an in vitro dissolution test according to USP 24, NF 19, 711 Dissolution, employing Apparatus 2 equipped with a paddle,the composition having a cylindrical shape optionally with one or more tapered ends.
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Abstract
A pharmaceutical composition for controlled release of an active substance is provided. The active substance is released into an aqueous medium by erosion of at least one surface of the composition. The composition comprises i) a matrix comprising a) polymer or a mixture of polymers, b) an active substance and, optionally, c) one or more pharmaceutically acceptable excipients, and ii) a coating.
101 Citations
38 Claims
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1. A pharmaceutical composition for controlled release of at least one therapeutically, prophylactically and/or diagnostically active substance into an aqueous medium by erosion of at least one surface of the composition, the composition comprising:
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a matrix composition comprising; a) one or more polyglycol homopolymers having an average molecular weight of from at least about 100,000 daltons to about 700,000 daltons, b) an opiod active substance, and, optionally, c) one or more pharmaceutically acceptable excipients, with the proviso that the matrix composition does not contain a water dispersible or water soluble surface active agent that has at least one domain which is compatible with the polymer in the matrix composition and at least one other domain which is lipophilic, and which has a melting point that is lower than the polymer in the matrix, the matrix having a coating having at least one opening exposing at least one surface of said matrix, the coating being insoluble in and impermeable to body fluids and comprising a polymer, wherein any matrix surface exposed to the aqueous medium erodes at a substantially constant rate, so that a zero order release is obtained of at least about 60% w/w of the active substance from the pharmaceutical composition when subject to an in vitro dissolution test according to USP 24, NF 19, 711 Dissolution, employing Apparatus 2 equipped with a paddle, the composition having a cylindrical shape optionally with one or more tapered ends. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification