Definition of "promethazine" []

• A first-generation H1 receptor antagonist, antihistamine and antiemetic medication with strong sedative effects. (noun)

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• "For example, Phenergan is a brand name for an antihistamine called promethazine (promethazine is the generic name)."
• "If vomiting is a problem when giving quinine by mouth, a medicine such as promethazine may help."
• "But if you use horse serum tetanus antitoxin, take precautions against allergic reaction: If the person suffers from asthma or other allergies, or has ever received any kind of antitoxin made from horse serum, give an injection of antihistamine such as promethazine 15 minutes before injecting the antitoxin."