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US5137733A Controlled release pharmaceutical preparation 失效
控制释放药物制剂

Controlled release pharmaceutical preparation
摘要:
A controlled release pharmaceutical preparation comprising a core containing a medicinal compound and a coating layer containing a water-repellent salt and a water-insoluble and slightly water-permeable acrylic polymer having trimethylammoniumethyl group. Said preparation releases a medicinal compound in a sigmoid type dissolution pattern irrespective of the PH of a dissolution medium.
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