DIFFUSION-OSMOSIS PHARMACEUTICAL SYSTEM WITH CONTROLLED DRUG RELEASE (VERSIONS) AND METHOD OF PREPARATION THEREOF

摘要

FIELD: pharmaceutical products. SUBSTANCE: system contains single-layer pellet core and polymer film coating. Core includes therapeutically active agent and hydrophilic polymer. In another version of invention, double-layer pellet core contains active substance and hydrophilic polymer in its first layer and hydrophilic polymer in its second layer. System has at least one opening in a part of film coating which is in contact with core or active substance-containing core layer. System may also have one ore several openings in its part being in contact with the second layer. Coating consists of ammonium-methacrylate copolymer and hydrophilic polymer is hydroxypropylmethylcellulose. EFFECT: eliminated use chlorinated solvents. 34 cl, 9 dwg, 2 tbl, 6 ex