Contac is a compounded formula that is primarily used to relieve symptoms caused by colds and flu. Its main ingredients include acetaminophen, dextromethorphan hydrobromide, pseudoephedrine hydrochloride and chlorpheniramine maleate. Acetaminophen is an antipyretic and analgesic, Dextromethorphan Hydrobromide is mainly used to relieve cough, and Pseudoephedrine Hydrochloride can constrict the blood vessels of the nasal mucosa and improve the symptoms of nasal congestion and runny nose. Chlorpheniramine maleate is an anti-allergic drug, through the mechanism of antihistamine, thus relieving the symptoms of allergy. Compound preparation of Contac, composed of these drugs, is mainly used for symptoms related to common cold or influenza, which can relieve fever, headache, limb pain, sneezing, runny nose, nasal congestion, cough, sore throat and other symptoms.