| 摘要 |
The present invention is directed to a coating composition for coating a sol id dosage form of a medicament, where the coating composition controls the release of the medicament, said coating composition comprising (a) at least 50% (w/w) by dry weight of a water insoluble polymer insoluble in both acidi c, basic and neutral pH, present in the form of an aqueous latex dispersion, (b ) a water soluble non-polymeric component present in a weight ratio of about 5 to about 50% (w/w) by dry weight of the coating, having a molecular weight o f less than about 15,000 daltons and water solubility in excess of 5 grams per 100 grams of water at room temperature at 1 atm pressure, said water soluble non-polymeric component being organic and either solid or liquid ; said rati o of water insoluble polymer to water soluble non-polymeric component ranging from about 95:5 to about 1:1, the solid content in the coating composition ranges from about 5% to about 25%, said water soluble component being completely dissolved in the aqueous latex dispersion. The present invention is also directed to a system for the controlled release of an active medicament comprising a substrate and a coating, said substrate comprising a therapeutically effective amount of a medicament in association with a pharmaceutical carrier insolid unit dosage form, said substrate being uniformly coated with the aforesaid coating composition.
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