Hyokof D Syrup Strawberry is a combination pharmaceutical formulation containing Phenylephrine (5mg/5ml), Chlorpheniramine Maleate (2mg/5ml), and Dextromethorphan Hydrobromide (10mg/5ml). This syrup is indicated for the symptomatic relief of upper respiratory tract conditions characterized by nasal congestion, allergic rhinitis, and cough. Phenylephrine acts as a selective alpha-1 adrenergic receptor agonist, providing effective nasal decongestion by vasoconstriction of the nasal mucosa. Chlorpheniramine Maleate, an antihistamine with anticholinergic properties, alleviates allergic symptoms such as sneezing, runny nose, and watery eyes by blocking H1 histamine receptors. Dextromethorphan Hydrobromide serves as a centrally acting antitussive agent, suppressing the cough reflex via action on the medullary cough center without causing significant sedation. Hyokof D Syrup is formulated in a palatable strawberry flavor to enhance patient compliance, particularly in pediatric populations. It is recommended to be used under medical supervision, adhering to prescribed dosages to minimize potential side effects such as drowsiness, dry mouth, or increased blood pressure. Contraindications include hypersensitivity to any component, concurrent use of monoamine oxidase inhibitors, and certain cardiovascular conditions. This multi-ingredient syrup offers comprehensive relief from common cold and allergic symptoms, improving patient comfort and quality of life.