Dextromethorphan + Chlorpheniramine Maleate + Phenylephrine Syrup belongs to the combination of three medicines: Dextromethorphan, Chlorpheniramine Maleate, Phenylephrine Syrup which helps in treating the dry cough. Dextromethorphan gives relief from the cough that blocks the passing of cough from the cough center to the muscles. Chlorpheniramine Maleate (CPM) helps in giving relief from the allergic symptoms which are caused by histamine. Phenylephrine helps in reducing the stuffy nose by narrowing the blood vessels which are located in the nasal passage. When these syrup are combined then the person gets relief from the dry cough.