Treat cough caused by various diseases. Compound dextromethorphan hydrobromide syrup mainly consists of dextromethorphan hydrobromide and pretraumatic lignoglycerin ether. Dextromethorphan hydrobromide is an antitussive agent, and guaiacol glycerol ether is a expectorant drug. The two drugs have a certain synergistic effect. In clinic, it is often used to treat cough and expectoration caused by various diseases. It should be noted that if the patient coughs and expectorates more, it is not enough to just give compound dextromethorphan hydrobromide syrup for treatment. It is necessary to give back tapping, vibration sputum drainage and other auxiliary measures to promote the sputum excretion of the patient, and even need to give fiberoptic bronchoscopy to clear the sputum in the airway. In addition, for the cough caused by bacterial infection with too much sputum, active anti infection treatment should be given while using expectorant drugs. The above scheme is only for reference. Please use the specific drugs under the guidance of professional doctors according to your own conditions.