Cough caused by inflammatory reactions in the respiratory system is the most common, and is treated clinically with peripheral cough suppressants, also known as terminal cough suppressants, which can be chosen from dioxopromethazine, which has a strong cough suppressant effect and also has a certain relaxation of bronchial smooth muscle, which can counteract inflammatory reactions in the airways, as well as a certain local anesthetic effect. Benzodiazepine can inhibit the reflex impulse of coughing, thus achieving the effect of cough suppression. Noscapine mainly inhibits the pulmonary detrusor reflex, which can release the spasm of bronchial smooth muscle and dilate the airway, and is mainly used for paroxysmal cough. Compound licorice tablets contain opium and licorice, which can reduce the irritation of airway mucosa by airway secretions and can relieve cough symptoms.