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This study intended to fabricate phenazopyridine/phthalimide (PAP/PIMD) nano-cocrystal to improve dissolution and oral bioavailability.PAP/PIMD nano-cocrystal is prepared by sonochemical synthesis,using SDS as the stabilizers.The fabricated nano-cocrystal is nearly spherical with the particle size from 30.0 nm to 50.0 nm.