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1. A long-acting parenteral pharmaceutical composition suitable for forming an in situ implant in a subject in need thereof following administration, the composition comprises a therapeutically effective amount of cariprazine or a pharmaceutically acceptable salt thereof, a pharmaceutically acceptable biodegradable carrier comprising poly(lactic-co-glycolic acid) (PLGA) containing a molar ratio of lactic to glycolic monomers of from 50:50 to 85:15 and having an inherent viscosity in the range of about 0.1 to about 0.8 dl/g, and a biocompatible solvent, wherein the composition releases the cariprazine or a pharmaceutically acceptable salt thereof for at least 4 weeks following a single administration, and wherein the composition is in the form of a solution.
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