Osmotic Device Containing Amantadine and an Osmotic Salt
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Abstract
The osmotic devices of the present invention contain a unitary core comprising a salt of amantadine and an osmotic salt, wherein the two salts have an ion in common. The release rate of the amantadine is a sigmoidal release. The osmotic device includes a semipermeable membrane having a controlled porosity that can be adapted as needed to cooperate with the osmotic salt in providing a predetermined drug release profile. The osmotic salt need not be coated and it is in admixture with the amantadine salt. The osmotic device further includes a drug-containing coat external to the semipermeable membrane. The osmotic device can include one or more additional drugs in the core and/or the drug-containing coat.
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Citations
99 Claims
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1-49. -49. (canceled)
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50. An osmotic device comprising a unitary core surrounded by a semipermeable membrane having at least one passageway there through, wherein:
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a) the unitary core comprises a mixture of amantadine salt, osmotic salt, and at least one other pharmaceutically acceptable excipient, and the weight ratio of amantadine salt to osmotic salt ranges from 2;
1 to 30;
1;b) the osmotic salt is not coated with a release rate controlling coating; c) the permeability of the semipermeable membrane is adapted to cooperate with the osmotic salt to control the release profile of amantadine salt from the osmotic device; d) the amantadine salt and osmotic salt have an ion in common; e) amantadine salt is released through the one or more passageways according to a sigmoidal controlled release profile, optionally wherein release of amantadine salt is delayed for a period of time, when the osmotic device is exposed to an aqueous environment of use; f) the semipermeable membrane comprises a cellulose acetate grade 1 and a cellulose acetate grade 2, wherein the weight ratio of a cellulose acetate grade 1 to the total amount of cellulose acetates ranges from 0;
1 to 1;
1, wherein the cellulose acetate grade 1 comprises 7-10% by wt. of hydroxyl groups, 30-36% by wt. of acetyl groups and a viscosity of 200-280 seconds, and cellulose acetate grade 2 comprises 3-5% by weight of hydroxyl groups, 37-43% by wt. of acetyl groups and a viscosity of 6.0-45.0 seconds; andg) the osmotic device further comprises a drug-containing coat comprising an active ingredient, wherein the coat is external to the semipermeable membrane.
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51. An osmotic device comprising a unitary core surrounded by a semipermeable membrane having at least one passageway there through, wherein:
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a) the unitary core comprises a mixture of amantadine salt, osmotic salt, and at least one other pharmaceutically acceptable excipient; b) the amantadine salt and osmotic salt have an ion in common; c) the weight ratio of amantadine salt to osmotic salt is in the range of 2;
1 to 30;
1;d) the semipermeable membrane comprises 1.7%-15.0% by wt. of a plasticizer, 33.3%-61.2% by wt. of cellulose acetate grade 1, and 33.3%-61.2% by wt. of cellulose acetate grade 2, wherein the cellulose acetate grade 1 comprises 7-10% by wt. of hydroxyl groups, 30-36% by wt. of acetyl groups and has a viscosity of 200-280 seconds, and the cellulose acetate grade 2 comprises 3-5% by weight of hydroxyl groups, 37-43% by wt. of acetyl groups and has a viscosity of 6.0-45.0 seconds; e) amantadine salt is released through the one or more passageways according to a sigmoidal release profile when the osmotic device is exposed to an aqueous environment of use; and f) the osmotic device further comprises a drug-containing coat comprising an active ingredient, wherein the coat is exterior to or on the exterior of the semipermeable membrane. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 95, 96, 97, 98, 99)
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94. (canceled)
Specification