Pulmonary tracheal obstruction should be selected for medication according to the cause of the obstruction. Common causes include tracheal foreign bodies, phlegm embolism, lung malignant tumors and other diseases. 1. Tracheal foreign bodies: foreign bodies should be removed as soon as possible to prevent asphyxia and other respiratory complications. Oral medication is basically ineffective, most of the tracheal foreign bodies can be removed by endoscopy, and those who can not be removed by endoscopy or have serious complications need surgical treatment. 2. Phlegm embolism: Expectorant drugs can be used for pulmonary airway obstruction caused by phlegm embolism. Commonly used drugs include Ambroxol Hydrochloride Tablets, N-Acetyl Cysteine Granules, and Eucalyptus-Pinocampus Enteric Soft Capsules, etc., which can promote the dilution of sputum, and facilitate the coughing of phlegm embolism. Larger sputum embolus can easily cause respiratory distress and lead to asphyxia, and bronchoscopy can be considered to remove the sputum embolus. 3. Malignant tumors of the lungs: it is necessary to actively carry out comprehensive treatment mainly based on surgery. At the same time, pay attention to whether the disease is combined with other lung diseases, if there are infections and other conditions can be appropriate application of antibiotics, such as penicillin and so on. There may be other reasons for the blockage of the lung airways, you should go to the hospital in time, improve the examination to clarify the cause of the disease, the specific medication, it is recommended to listen to the doctor’s advice. The above drugs should be used under the guidance of a doctor, avoid self-medication.