Western cough medicine is mainly divided into central cough medicine and peripheral cough medicine, and phlegm medicine is mainly divided into mucus regulators, mucolytics and mucus promoters, etc. Commonly used cough suppressants such as codeine phosphate oral solution, hydrobromine, dextromethorphan oral solution; phlegmolytic drugs include tranylcypromine, acetylcysteine, carboxymethylstilbestrol and so on. All of these can promote the dilution of mucus, make the mucus less viscous and promote the discharge of mucus out of the body, which is still effective. For a lot of cough, cough phlegm including breathing difficulties, ah, can play a good role.