Cough Suppressant Dosage for Child Recommended cough suppressants: Delsym (12 months and up) Benylin Pediatric (6 months and up) Robitussin Pediatric Cough Suppressant (6 months and up) See below for dosage charts. Ingredient: Dextromethorphan The Dextromethorphan (DM for short) is a cough suppressant. It acts by blocking the cough reflex center in the brain. It […]