Allergic conditions
Adult: As promethazine hydrochloride: 25 mg at night, may be increased up to 25 mg bid if necessary. Alternatively, 10-20 mg 2-3 times daily.
Child: As promethazine hydrochloride: 2-5 years As solution or syr: 5-15 mg daily in 1 or 2 divided doses; >5-10 years As tab/solution or syr: 10-25 mg daily in 1 or 2 divided doses; >10 years As tab/solution or syr: Same as adult dose.
Nausea and vomiting
Adult: As promethazine hydrochloride: 12.5-25 mg every 4-6 hours, as needed. Due to labyrinthitis and other causes: As promethazine teoclate: 25 mg at night, may be increased to 50 or 75 mg at night, or to 25 mg 2 or 3 times daily if necessary. Max: 100 mg daily.
Child: Due to labyrinthitis and other causes: As promethazine teoclate: 5-10 years 12.5-37.5 mg daily. >10 years Same as the lower adult dose.