There are many expectorant drugs for bronchitis, mainly the following: i. Western drugs: common ones are carboxymethystane oral solution, tranexamic acid hydrochloride syrup, acetylcysteine oral solution, these drugs can dilute phlegm and promote phlegm discharge. Second, proprietary Chinese medicines: such as honey-refined Chuanbei loquat paste, snake bile Chuanbei liquid, snake bile Chenpi san, compound licorice oral solution, compound licorice tablets, lung power cough combination, usually these drugs have the effect of expectorant, phlegm and cough suppression. When using these drugs, patients should drink more warm boiled water, which can promote the dilution of phlegm and its discharge. Patients should actively cooperate with anti-pathogenic treatment, mainly for bacterial infections when they can choose to use sensitive antibiotics.