Sustained-release microparticle composition. The microparticle composition can be formulated to provide extended release over a period of from about 7 days to about 200 days. The microparticles may be formulated with a biodegradable and biocompatible polymer, and an active agent, such as risperidone, 9-hydroxy-risperidone, and pharmaceutically acceptable acid addition salts of the foregoing.

 
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