Extending the duration of drug release within the stomach during the fed mode

CAFC
  • US 6,340,475 B2
  • Filed: 03/29/1999
  • Issued: 01/22/2002
  • Est. Priority Date: 06/06/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A controlled-release oral drug dosage form for releasing a drug whose solubility in water is greater than one part by weight of said drug in ten parts by weight of water, said dosage form comprising a solid polymeric matrix with said drug dispersed therein at a weight ratio of drug to polymer of from about 15:

  • 85 to about 80;

    20, said polymeric matrix being one that swells upon imbibition of water thereby attaining a size large enough to promote retention in the stomach during said fed mode, that releases said drug into gastric fluid by the dissolution and diffusion of said drug out of said matrix by said gastric fluid, that upon immersion in gastric fluid retains at least about 40% of said drug one hour after such immersion and releases substantially all of said drug within about eight hours after such immersion, and that remains substantially intact until all of said drug is released.

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