A synthetic propylpiperazine derivative of phenothiazine with antiemetic, antipsychotic, antihistaminic, and anticholinergic activities. Prochlorperazine antagonizes the dopamine D2-receptor in the chemoreceptor trigger zone (CTZ) of the brain and may prevent chemotherapy-induced emesis. OR A drug used to prevent or reduce nausea and vomiting. It belongs to the family of drugs called antiemetics.