Disclosed herein is a method for producing an aripiprazole suspension comprising the steps of: a) combining bulk aripiprazole and a vehicle to form a primary suspension b) subjecting the primary suspension to first pulverization to form a secondary suspension and c) subjecting the secondary suspension to a second pulverization to form a final suspension, where in the first pulverization of step b), the secondary suspension is formed by pulverizing the primary suspension using a high sheer pulverizing machine or a dispersion machine that applies shear force to a material to be processed, and in the second pulverization of step c), the final suspension is formed by pulverizing the secondary suspension using a high-pressure homogenizer.
