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Controlled release pharmaceutical preparation and method for producing the same

  • US 5,068,112 A
  • Filed: 03/24/1989
  • Issued: 11/26/1991
  • Est. Priority Date: 03/31/1988
  • Status: Expired due to Term
First Claim
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1. A controlled release pharmaceutical preparation comprising:

  • (A) a core containing a pharmaceutically active ingredient and succinic acid; and

    (B) a porous cellulose film formed on the surface of said core by spraying a water-organic solvent mixture containing ethyl cellulose or a mixture of ethyl cellulose and hydroxypropyl cellulose, said porous cellulose film having a porosity of about 0.4 to 0.9 calculated according to the formula;

    ##EQU2##

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