Process for preparing an oral osomotic controlled drug delivery system for a sparingly soluble drug

摘要

The present invention is for an oral osmotic controlled drug delivery system for a sparingly soluble drug comprising:a. a core comprising (i) finely particulate anhydrous carbamazepine (ii) a polymeric swelling agent consisting of one or more swellable hydrophilic polymers selected such that the polymeric swelling agent exhibits controlled swelling and the wall does not rupture or burst, (iii) a crystal habit modifier in whose presence, upon contact with an aqueous medium, the anhydrous carbamazepine being transformed into cuboidal or rod-shaped crystals of the dihydrate of carbamazepine, or mixtures thereof, and (iv) water-soluble compounds for inducing osmosis,b. a wall made of acylated cellulose which is impermeable to the components of the core, but permeable to water, andc. a passageway through the wall for releasing the components present in the core to the surrounding environment.