An osmotic system is disclosed comprising a wall comprising in at least a part of a semipermeable material that surrounds a compartment. The compartment contains a first osmotic composition comprising a beneficial drug selected from the group consisting of a calcium antagonist, angiotensin enzyme inhibitor...http://www.google.com.au/patents/US4783337?utm_source=gb-gplus-sharePatent US4783337 - Osmotic system comprising plurality of members for dispensing drug
