Zerotuss-D Syrup Sugar Free is a combination antitussive and antihistamine formulation containing Chlorpheniramine Maleate 2mg and Dextromethorphan Hydrobromide 10mg per 5ml. Chlorpheniramine Maleate is a first-generation antihistamine that competitively inhibits H1 histamine receptors, thereby alleviating allergic symptoms such as rhinorrhea, sneezing, and nasal congestion commonly associated with upper respiratory tract infections and allergic conditions. Dextromethorphan Hydrobromide acts centrally on the cough center in the medulla to suppress the cough reflex, providing effective relief from dry, non-productive cough. The sugar-free formulation makes Zerotuss-D Syrup suitable for diabetic patients and individuals requiring reduced sugar intake. This medication is indicated for symptomatic relief of cough and allergic manifestations related to common cold, bronchitis, and other respiratory tract irritations. It should be used with caution in patients with a history of hypersensitivity to any component, glaucoma, or respiratory depression. Dosage should be strictly adhered to as per medical advice to avoid potential side effects such as drowsiness, dizziness, or gastrointestinal disturbances. Zerotuss-D Syrup Sugar Free offers a balanced approach to managing cough and allergy symptoms, improving patient comfort and respiratory function.