Also available in 1 mL, 25 mg, 50 mg, 100 mg, 500 mg and bulk. Please contact Fisher for quotes. Prochlorperazine Maleate (Capazine) is a phenothiazine antipsychotic used principally in the treatment of NAUSEA; VOMITING; and VERTIGO. It is more likely than CHLORPROMAZINE to cause EXTRAPYRAMIDAL DISORDERS. Purity 99.99%