The present invention is directed to solid, sustained-release, oral dosage form pharmaceutical compositions which contain therapeutic amounts of a pharmaceutically active agent, hydroxypropyl methyl cellulose and anon-ionic, hydrophilic polymer selected from the group consisting of hydroxyethyl cellulose having a number average molecular weight ranging from 90,000 to 1,300,000, hydroxypropyl cellulose having a number average molecular weight of 370,000 to 1,500,000, and poly(ethylene oxide) having a number average molecular weight ranging from 100,000 to 500,000.
