COSTUS – D SYRUP with powerful formulation of Dextromethorphan 10mg + chlorpheniramine maleate 2 mg + phenylephrine hydrochloride 5mg is helps suppress dry, non-productive cough, Chlorpheniramine Maleate relieves allergy-related symptoms such as sneezing and runny nose, while Phenylephrine Hydrochloride acts as a nasal decongestant to reduce blocked nose and sinus congestion, helping patients breathe more comfortably.