Ai Chang is also called pediatric pseudoephedrine drops, this drug is a compound preparation, the main ingredients include pseudoephedrine hydrochloride, dextromethorphan hydrobromide. The two main ingredients of this drug, pseudoephedrine hydrochloride can constrict the blood vessels of the nasal mucosa and reduce nasal congestion and other symptoms. Dextromethorphan hydrobromide is a cough suppressant, which produces cough suppression by inhibiting the medullary cough center. The combination of these two main ingredients of Aizhuang or pseudo-malmefene drops is mainly used for the symptomatic treatment of nasal congestion, runny nose, cough and other symptoms caused by cold or cough fever, or other upper respiratory tract allergies in infants and children. When using this drug, it should be noted that if the child’s symptoms do not improve significantly within five days or appear to be severe, the drug should be discontinued promptly and a hospital visit should be made. In conclusion, this drug is mainly used for symptomatic treatment of nasal congestion, runny nose, cough and other symptoms in infants and children.