Osmotic Pump Drug Release

**Semantic type:** Functional Concept

**Definition:** Drug release controlled by an osmotic agent that acts to imbibe water from the surrounding medium via a semipermeable membrane which is permeable to water but impermeable to drug. The delivery of the active agent from the device is controlled by water influx across the semipermeable membrane forcing the drug out of an orifice in the device.

**Synonyms:** - Osmotic Pump