Prochlorperazine maleate is an antidepressant used to treat nausea and vomiting. It works by blocking dopamine receptors in the brain. It is prescribed to treat nausea caused by conditions such as gastroenteritis, motion sickness, and as a premedication for surgery and chemotherapy. Prochlorperazine maleate tablets and suppositories are available generically and under the brand names Compazine....