Cough suppressants, phlegm removers and anti-allergy drugs are not one kind of drugs but three kinds of drugs, such as cough suppressants (i.e., cough suppressants) such as dextromethorphan, phlegm removers such as ambroxol and anti-allergy drugs such as loratadine. 1. Cough suppressants: generally there are central cough suppressants and peripheral cough suppressants, clinically more commonly used are dextromethorphan, codeine and phenprocoumon. 2. Phlegmolytic drugs: generally there are mucolytic agents, mucolytic agents and polysaccharide cellulose decomposition agents, etc., clinically available acetylcysteine, aminoglutethimide and carbocysteine, etc.. 3. Anti-allergic drugs: the most commonly used anti-allergic drugs are antihistamines, such as loratadine and cetirizine. Cough and phlegm anti-allergy drugs, specific need to physician or pharmacist combined with the individual’s condition to give guidance on the use of medication, do not self-medication.