Xoncof D Syrup Sugar Free is a combination pharmaceutical formulation containing Phenylephrine (5mg/5ml), Chlorpheniramine Maleate (2mg/5ml), and Dextromethorphan Hydrobromide (10mg/5ml), designed for the symptomatic relief of upper respiratory tract conditions. Phenylephrine acts as a selective alpha-1 adrenergic receptor agonist, providing effective nasal decongestion by vasoconstriction of the nasal mucosa. Chlorpheniramine Maleate is a first-generation antihistamine that alleviates allergic symptoms such as sneezing, rhinorrhea, and itching by competitively inhibiting histamine H1 receptors. Dextromethorphan Hydrobromide serves as a centrally acting antitussive agent, suppressing the cough reflex by acting on the medullary cough center without causing significant respiratory depression. The sugar-free formulation makes Xoncof D Syrup suitable for patients with diabetes or those requiring sugar-restricted diets. This combination is indicated for the management of cough, nasal congestion, and allergic manifestations associated with common cold, sinusitis, and allergic rhinitis. It is important to use Xoncof D Syrup under medical supervision, considering potential contraindications such as hypertension, glaucoma, and concurrent use of monoamine oxidase inhibitors. Adverse effects may include drowsiness, dry mouth, dizziness, and gastrointestinal disturbances. Proper dosing and adherence to prescribed guidelines are essential to maximize therapeutic benefits and minimize risks.