Promethazine DM Dosage

Generic name: tromethorphan hydrobromide and promethazine hydrochloride
Dosage form: oral syrup

This dosage information does not include all the information needed to use Promethazine DM safely and effectively. See full prescribing information for Promethazine DM.

The information at is not a substitute for medical advice. ALWAYS consult your doctor or pharmacist.

Promethazine hydrochloride and dextromethorphan hydrobromide syrup is contraindicated for children under 2 years of age (see WARNINGS –Black Box Warning and Use In Pediatric Patients).

The average effective dose is given in the following table:


1 teaspoonful (5 mL) every 4 to 6 hours,
not to exceed 30 mL in 24 hours.
Children 6 Years To Under 12 Years

½ to 1 teaspoonful (2.5 to 5 mL) every 4 to 6 hours,
not to exceed 20 mL in 24 hours.
Children 2 Years To Under 6 Years

¼ to ½ teaspoonful (1.25 to 2.5 mL) every 4 to 6 hours,
not to exceed 10 mL in 24 hours.

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