Cough suppressing drugs for lung cancer include dextromethorphan, codeine and so on. Lung cancer patients have cough due to tumor cells pressing airways or invading mucosa and nerves. At this time, patients can take dextromethorphan, codeine and other drugs to relieve cough and improve clinical symptoms. Due to the existence of a certain degree of individual variability, there is no absolute safest and most effective drug in the process of use, nausea, dizziness, diarrhea and other adverse reactions may occur, and need to be used in strict accordance with the medical advice, drug allergy is prohibited.