Membrane-coated sustained-release tablets and method

Details Membrane-coated sustained-release tablets and method Membrane-coated sustained-release tablets and method

1985-09-19

1986-12-16

Rose, Shep K.

Drug, bio-affecting and body treating compositions

Identification or warning feature

Taste or smell or chemical irritation to the eye, nose, or...

424 16, 424 19, 424 21, 424 22, 424 32, 424 33, A61K 928, A61K 932

Patent

active

046296190

ABSTRACT:
A sustained-release coated pharmaceutical tablet comprising a drug-containing tablet and a coating or membrane surrounding the same, wherein the coating or membrane is water-insoluble and insoluble in gastrointestinal fluids and consists essentially of a terpolymer of polyvinylchloride, polyvinylacetate, and polyvinylalcohol and a water-soluble pore-creating substance, the said pore-creating substance being randomly distributed in said terpolymer coating, said pore-creating substance being present in amount of one part to 35 parts for each one to ten parts of terpolymer, said coated tablet exhibiting a substantially constant dissolution rate during a major portion of its dissolution time when exposed to gastrointestinal fluids, especially wherein the terpolymer contains 80 to 95% weight per weight of polyvinylchloride, 0.5 to 19% weight per weight of polyvinylacetate, and 0.5 to 10% weight of polyvinylalcohol, and a method for the preparation thereof, are disclosed.

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