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Therapeutic system for sparingly soluble active ingredients

  • US 4,992,278 A
  • Filed: 08/03/1989
  • Issued: 02/12/1991
  • Est. Priority Date: 01/14/1987
  • Status: Expired due to Fees
First Claim
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1. Peroral therapeutic system in tablet form for continuous and controlled administration of active ingredients that are sparingly soluble in water, consisting of(a) a casing made of a material that is permeable to water and impermeable to the components of the core containing the active ingredient,(b) a compressed core from a granular powder of an active ingredient that is sparingly soluble in water or a mixture of such active ingredients, a hydrophilic, polymeric swelling agent consisting of a mixture of a vinylpyrrolidone/vinyl acetate copolymer with an ethylene oxide homopolymer, optionally a water-soluble substance for inducing osmosis and optionally other pharmaceutically acceptable adjuncts and(c) a passage through the casing (a) for the transport of the constituents contained in the core into the surrounding aqueous body fluid.

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