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Sustained release tablet

  • US 5,593,694 A
  • Filed: 06/24/1994
  • Issued: 01/14/1997
  • Est. Priority Date: 10/04/1991
  • Status: Expired due to Fees
First Claim
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1. A zero order dissolution sustained release tablet comprising a base tablet comprising a water-swellable gelling agent in a proportion of not less than 20% by weight per base tablet and a pharmaceutically active ingredient dispersed homogeneously in said gelling agent, said base tablet being coated with a film coating composition consisting essentially of one prepared by dissolving at least one member selected from the group consisting of ethylcellulose and acetylcellulose as a main component in an organic solvent, wherein the film coating composition is used in a proportion of 0.5-15% by weight relative to the base tablet, the thickness of the film is 0.002-0.05 mm at the side and 0.003-0.06 mm at the top or the bottom, and the ratio of the film thickness at the side to that at the top or the bottom is 0.55-0.85.

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