Sustained release pharmaceutical preparation

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/36 (2006.01) A61K 9/32 (2006.01) A61K 9/50 (2006.01) A61K 31/4166 (2006.01)

Patent

CA 2337046

The present invention pertains to a sustained release drug delivery system which comprises a core of active ingredient, an enteric coating, a second coating of active ingredient and lastly a readily gastric- soluble protective coating. In another embodiment, the sustained release drug delivery system comprises a core of active ingredient, an enteric coating; a second coating of active ingredient; a second enteric coating and a third coating of active ingredient. The sustained release dosage form of this invention is useful for pharmaceutically active ingredients that have limited aqueous solubility, especially phenytoin sodium, and other pH dependent soluble drugs.

L'invention concerne un système de distribution de médicament à libération prolongée, qui comprend un coeur constitué d'un principe actif, un revêtement gastro-résistant, un second revêtement constitué d'un principe actif et enfin un revêtement protecteur facilement dissous par le suc gastrique. Dans un autre mode de réalisation, ledit système comprend un coeur constitué d'un principe actif, un revêtement gastro-résistant, un second revêtement constitué d'un principe actif, un second revêtement gastro-résistant et un troisième revêtement constitué d'un principe actif. Cette forme galénique à libération prolongée de l'invention est utile pour les principes pharmaceutiquement actifs qui ont une solubilité dans l'eau limitée, notamment la phénytoïne sodique, et les médicaments dont la solubilité dépend du pH.

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