Benylin with codeine cough syrup contains Diphenhydramine ammonium chloride and codeine. This combination relieves congestion dries a runny nose and post-nasal drip thins mucus to relief coughing and also suppresses the cough reflex centrally. Diphenhydramine is an antihistamine that relieves congestion and post-nasal drips while ammonium chloride is the expectorant which thins mucus. Codeine suppresses the cough reflex by calming the part of the brain that regulates coughing.
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