CONTROLLED RELEASE MICROSPHERES

摘要

An injectable preparation is disclosed in which a therapeutically effective drug such as a local anesthetic is dispersed in microspheres of a biodegradable controlled release polymeric material, such as a polyanhydride or a polyorthoester. In certain embodiments, the polymeric material is composed of a copolymer of lactic acid and/or glycolic acid. The injectable preparation is capable of providing prolonged anesthesia to a desired area of treatment in an animal or human.