Microparticles coated polymer for extended release.

Sustained release microparticles for parenteral administration of a therapeutic agent comprising: a core comprising a biodegradable polymer and said therapeutic agent, and a coating comprising a polymeric synthetic wax biocompatible, bioabsorbable comprising the reaction product of a polybasic acid or derivative thereof, a fatty acid; and a polyol, said polymeric wax having a melting point below 70 ° C fusion, as determined by differential scanning calorimetry in the sweep.