1) Antiemetic 2) Antiemetic drug 3) Antihistamine 4) Promethazine 1) Promethazine 
(fen´әr-gәn) trademark for preparations of promethazine, an antihistamine, antiemetic, and sedative.
A common prescription medication that is used as a sedative to relieve pain or to treat nausea and vomiting. Pregnant women may benefit from the use of Phenergan, but should speak with their healthcare provider prior to doing so.