A dry cough may be a viral upper respiratory infection. You can take antiviral oral liquid and compound licorice tablets. For dry cough caused by chronic bronchitis, methotrexate and keping tablets should be taken. If there is bacterial infection, please take azithromycin dispersible tablets or cefixime capsules. If the sputum is thick and difficult to cough, please use ambroxol hydrochloride and ambroxol.