As an antihistamine, Phenergan (Promethazine) is used to treat allergy symptoms such as a runny nose or itching from a rash. In addition to that, Phenergan may also be used to combat the occurrence of nausea and vomiting after a surgery. Phenergan works by blocking histamines that are created during an allergic reaction. The drug blocks out pain and nausea by altering natural substances such as acetylcholine.
Drug Name: Phenergan
Generic name: Promethazine hydrochloride