Drug compositions containing controlled release hypromellose matrices
First Claim
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1. A controlled release formulation for use in oral dosage forms, comprising a mixture containing hypromellose and polyvinyl acetate phthalate, said polyvinyl acetate phthalate being present in amount which is effective to provide controlled release of a pharmaceutically active ingredient in vitro when said mixture is compressed into a swellable, hydrophilic matrix.
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Abstract
This invention is directed to a controlled release formulation for an oral dosage form that is formulated into a swellable, hydrophilic matrix. The controlled release formulation contains a mixture of hypromellose and polyvinyl acetate phthalate and allows pharmaceutically active ingredients combined therewith to be released in a controlled release manner.
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30 Claims
- 1. A controlled release formulation for use in oral dosage forms, comprising a mixture containing hypromellose and polyvinyl acetate phthalate, said polyvinyl acetate phthalate being present in amount which is effective to provide controlled release of a pharmaceutically active ingredient in vitro when said mixture is compressed into a swellable, hydrophilic matrix.
Specification