Zerotuss-D Junior Syrup is a pediatric formulation combining Chlorpheniramine Maleate (2mg/5ml) and Dextromethorphan Hydrobromide (10mg/5ml) designed to provide effective symptomatic relief from cough and allergic manifestations in children. Chlorpheniramine Maleate, an antihistamine, acts by competitively inhibiting histamine H1 receptors, thereby alleviating allergic symptoms such as rhinorrhea, sneezing, and nasal congestion commonly associated with upper respiratory tract infections or allergic rhinitis. Dextromethorphan Hydrobromide functions as a centrally acting antitussive agent, suppressing the cough reflex by acting on the medullary cough center without causing respiratory depression. This combination is particularly beneficial in managing non-productive cough accompanied by allergic symptoms, enhancing patient comfort and promoting restful sleep. Zerotuss-D Junior Syrup is intended for pediatric use under medical supervision, with dosing adjusted according to the child’s age and weight to ensure safety and efficacy. Caution is advised in patients with a history of hypersensitivity to either component, and it should be used with care in children with respiratory conditions such as asthma. The syrup formulation facilitates ease of administration, improving compliance in pediatric patients. As with all medications, it is essential to adhere to prescribed dosages and consult a healthcare professional if symptoms persist or worsen.