dispersed drug for a sustained or extended period as compared to the release from an isotonic saline solution this can result in prolonged delivery over say 1 to 2 000 hours preferably 2 to 800 hours of effective amounts say 0 0001 mg kg hour to 10 mg kg hour of the drug this dosage form can be administered as is necessary depending on the subject being treated the severity of the affliction the judgment of the prescribing physician and the like individual formulations of drugs and lactone copolymers may be tested in appropriate in vitro and in vivo models to achieve the desired drug release profiles for example a drug could be formulated with a liquid copolymer and injected into an animal the drug release profile could then be monitored by appropriate means such as by taking blood samples at specific times and assaying the samples for drug concentration following this or similar procedures those skilled in the art will be able to formulate a variety of sustained release parenteral formulations the following examples illustrate but are not intended to limit the scope of the claimed invention a flame dried 500 ml single neck round bottom flask was charged with 150 0 grams 1 47 mol of 1 4 dioxanone 150 0 grams 1 04 mol of l lactide 60 0 grams 0 65 mol of glycerol and 0 25 ml 0 75 mmol of a 0 33m solution of stannous octoate in toluene the flask was fitted with a flame dried mechanical stirrer the reactor flask.