Diffusion-osmotic controlled drug-release pharmaceutical composition and process for preparing same
First Claim
1. A diffusion-osmotic controlled drug-release pharmaceutical composition comprising a tablet core containing a therapeutically active agent and a hydrophilic polymer, wherein said tablet core is coated with a polymeric film-coat, and said film-coat contains at least one bore in said film-coat in contact with said tablet core, said film-coat comprising an ammonium methacrylate copolymer and said hydrophilic polymer comprising hydroxypropyl methylcellulose, said film-coat being present in an amount of 3 to 25 mg/cm2 in relation to the surface of said tablet core.
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Abstract
The invention relates to a novel diffusion-osmotic controlled drug-release pharmaceutical composition containing a one-layer tablet core including a polymeric film-coat, a therapeutically active agent and a hydrophilic polymer; if desired, a two-layer tablet core including active agent and hydrophilic polymer in the first layer thereof and a hydrophilic polymer in the second layer thereof; at least one bore on the part of film-coat in contact with the core or core layer containing the active agent; and, if desired, containing one or more bore(s) in the part thereof in contact with the second layer containing the hydrophilic polymer, which comprises an ammonium methacrylate copolymer as coating material and hydroxypropyl-methylcellulose as hydrophilic polymer. The composition according to the invention is useful for preparing controlled drug-release tablets containing as active agents e.g. β-adrenergic inhibitors (e.g. propranolol) calcium-antagonists (e.g. nifedipine), angiotensin convertase enzyme (ACE) inhibitors (e.g. captopril); prazosin; or nitroglycerol, all used in heart and circulation diseases; vasodilatory active agents (e.g. pentoxyfylline), nonsteroidal antiinflammatory agents (e.g. naproxene), analgetic drugs (e.g. morphine) and drugs acting on the central nervous system (e.g. amitriptyline, buspiron). The invention furthermore relates to a process for the preparation of the above compositions.
77 Citations
51 Claims
- 1. A diffusion-osmotic controlled drug-release pharmaceutical composition comprising a tablet core containing a therapeutically active agent and a hydrophilic polymer, wherein said tablet core is coated with a polymeric film-coat, and said film-coat contains at least one bore in said film-coat in contact with said tablet core, said film-coat comprising an ammonium methacrylate copolymer and said hydrophilic polymer comprising hydroxypropyl methylcellulose, said film-coat being present in an amount of 3 to 25 mg/cm2 in relation to the surface of said tablet core.
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10. A diffusion-osmotic controlled drug-release pharmaceutical composition comprising a tablet core containing a therapeutically active agent, 5 to 30% by weight of hydroxypropyl methylcellulose, 0 to 90% by weight of filling material, at most 5% by weight of binding material and at most 5% by weight of lubricant in relation to the total weight of said tablet core;
- wherein said tablet core is coated with a polymeric film-coat of an ammonium methacrylate copolymer, and said film-coat contains at least one bore in said film-coat in contact with said tablet core, said film-coat being present in amount of 3 to 25 mg/cm2 in relation to the surface of said tablet core, and said film-coat contains one or more bores of 0.1 to 1.0 mm2 in cross-section.
- 11. A diffusion-osmotic controlled drug-release pharmaceutical composition comprising a two-layer tablet core, wherein the first layer of said two-layer tablet core contains a therapeutically active agent and a hydrophilic polymer, and the second layer of said two-layer tablet core contains a hydrophilic polymer, said two-layer tablet core being covered with a polymeric film-coat, the part of said film-coat in contact with said first layer contains at least one bore and the part of said film-coat in contact with said second layer optionally contains at least one bore, said film-coat comprising an ammonium methacrylate copolymer and said hydrophilic polymer comprising hydroxypropyl methylcellulose, said film-coat being present in an amount of 3 to 25 mg/cm2 in relation to the surface of said two-layer tablet core.
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26. A diffusion-osmotic controlled drug-release pharmaceutical composition comprising a two-layer tablet core, wherein the first layer of said two-layer tablet core contains a therapeutically active agent, 5 to 30% by weight of hydroxypropyl methylcellulose, 0 to 90% by weight of filling material, at most 5% by weight of binding material and at most 5% by weight of lubricant in relation to the total weight of said first layer;
- and the second layer of said two-layer tablet core contains 30 to 100% by weight of hydroxypropyl methylcellulose having a viscosity higher than 1000 cP in 2% aqueous solution, 0 to 70% by weight of filling material, 0 to 5% by weight of binding material and 0 to 5% by weight of lubricant in relation to the total weight of said second layer;
said two-layer tablet core being covered with a polymeric film-coat containing an ammonium methacrylate copolymer, the part of said film-coat in contact with said first layer contains at least one bore and the part of said film-coat in contact with said second layer optionally contains at least one bore, said film-coat being present in amount of 3 to 25 mg/cm2 in relation to the surface of said two-layer tablet core.
- and the second layer of said two-layer tablet core contains 30 to 100% by weight of hydroxypropyl methylcellulose having a viscosity higher than 1000 cP in 2% aqueous solution, 0 to 70% by weight of filling material, 0 to 5% by weight of binding material and 0 to 5% by weight of lubricant in relation to the total weight of said second layer;
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27. A process for the preparation of a diffusion-osmotic controlled drug-release pharmaceutical composition comprising a tablet core containing a therapeutically active agent and a hydrophilic polymer, and said tablet core is coated with a polymeric film-coat, wherein said film-coat contains at least one bore in said film-coat in contact with said tablet core;
- said process comprising using hydroxypropyl methylcellulose as said hydrophilic polymer and an ammonium methacrylate copolymer as said coating material in an amount of 3 to 25 mg/cm2 in relation to the surface of said tablet core.
- View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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36. A process for the preparation of a diffusion-osmotic controlled drug-release pharmaceutical composition comprising a tablet core containing a therapeutically active agent and hydroxypropyl methylcellulose, wherein said tablet core is coated with a polymeric film-coat of an ammonium methacrylate copolymer, and said film-coat contains at least one bore in said film-coat in contact with said tablet core;
- said process comprising mixing a therapeutically active agent with 5 to 30% by weight of hydroxypropyl methylcellulose and 0 to 90% by weight of filling material in relation to the total weight of said tablet core to form a mixture;
mixing at most 5% by weight of lubricant with said mixture directly or after granulating with at most 5% by weight of binding material;
preparing said tablet core by compression;
coating said tablet core with an ammonium methacrylate copolymer in an amount of 3 to 25 mg/cm2 in relation to the surface of said tablet core to form a film-coat on said tablet core; and
establishing at least one bore of 0.01 to 1.0 mm2 in cross-section on said film-coat. - View Dependent Claims (37)
- said process comprising mixing a therapeutically active agent with 5 to 30% by weight of hydroxypropyl methylcellulose and 0 to 90% by weight of filling material in relation to the total weight of said tablet core to form a mixture;
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38. A process for the preparation of a diffusion-osmotic controlled drug-release pharmaceutical composition comprising a two-layer tablet core, wherein the first layer of said two-layer tablet core contains a therapeutically active agent and a hydrophilic polymer, wherein the second layer of said two-layer tablet core contains a hydrophilic polymer, wherein said two-layer tablet core is covered with a polymeric film-coat of an ammonium methacrylate copolymer, the part of said film-coat in contact with said first layer contains at least one bore and the part of said film-coat in contact with said second layer optionally contains at least one bore;
- said process comprising using hydroxypropyl methylcellulose as said hydrophilic polymer and an ammonium methacrylate copolymer as said coating material in an amount of 3 to 25 mg/cm2 in relation to the surface of said two-layer tablet core.
- View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A process for the preparation of a diffusion-osmotic controlled drug-release pharmaceutical composition comprising a two-layer tablet core, wherein the first layer of said two-layer tablet core contains a therapeutically active agent and hydroxypropyl methylcellulose, wherein the second layer of said two-layer tablet core contains hydroxypropyl methylcellulose, wherein said two-layer tablet core is covered with a polymeric film-coat of an ammonium methacrylate copolymer, the part of said film-coat in contact with said first layer contains at least one bore and the part of said film-coat in contact with said second layer optionally contains at least one bore;
- said process comprising mixing a therapeutically active agent with 5 to 30% by weight of hydroxypropyl methylcellulose and 0 to 90% by weight of filling material in relation to the total weight of said first layer to form a mixture;
mixing at most 5% by weight of lubricant with said mixture directly or after granulating with at most 5% by weight of binding material;
preparing said first layer by compression;
preparing a two-layer tablet core by pressing onto said first layer said second layer (i) consisting of hydroxypropyl methylcellulose having a viscosity higher than 1000 cP in 2% aqueous solution or (ii) containing 30 to 100% by weight of hydroxypropyl methylcellulose having a viscosity higher than 1000 cP in 2% aqueous solution, 0 to 70% by weight of filling material, 0 to 5% by weight of binding material and 0 to 5% by weight of lubricant in relation to the total weight of said second layer;
coating said two-layer tablet core with an ammonium methacrylate copolymer in an amount of 3 to 25 mg/cm2 in relation to the surface of said two-layer tablet core to form a film-coat on said two-layer tablet core; and
establishing at least one bore on said film-coat in contact with said first layer and optionally at least one bore on said film-coat in contact with said second layer. - View Dependent Claims (51)
- said process comprising mixing a therapeutically active agent with 5 to 30% by weight of hydroxypropyl methylcellulose and 0 to 90% by weight of filling material in relation to the total weight of said first layer to form a mixture;
Specification