At intervals of five to nine days, healthy volunteers were given two 12.5-mg promethazine rectal suppositories, one 25-mg suppository, one 50-mg suppository, or 50 mg (10 mL) of promethazine oral ...

After enrollment and completion of study period 1 (treatment D, 50 mg [10 mL] of promethazine oral syrup), one subject was withdrawn from the study because of violation of study protocol.

Promethazine HCl 6.25mg, dextromethorphan HBr 15mg; per 5mL; liq; contains alcohol 7%. Dextromethorphan is an antitussive agent and, unlike the isomeric levorphanol, it has no analgesic or ...