Pulmonary effusion usually refers to pleural effusion caused by various reasons, according to the different causes, the therapeutic medication is different, there is no special effect drug for the treatment of pleural effusion. 1. If pleural effusion is caused by tuberculosis, it can be treated with standardized tuberculosis treatment (isoniazid, rifampicin and other drugs), and the pleural effusion can be drained as soon as possible (to avoid pleural adhesion), and no more pleural effusion will occur after the tuberculosis is controlled and cured. 2. If pleural effusion is caused by pneumonia, pleurisy and other diseases, the effusion can usually be self-absorbed after applying effective antibiotic treatment, and the specific drugs should be combined with the results of bacterial culture and drug sensitivity test. 3. Pleural effusion can also be seen in extrapulmonary diseases, such as heart failure, usually given cardiotonic diuretic treatment, pleural effusion can be self-absorbed; by cirrhosis of the liver, nephrotic syndrome and so on caused by hypoproteinemia can also lead to pleural effusion, at this time should be supplemented with albumin. 4. If the pleural effusion is caused by advanced malignant tumor, there is no effective treatment for it with the current medical level, and the symptoms can be relieved by extracting the effusion through thoracocentesis, and when the malignant tumor itself can be effectively controlled, the pleural effusion will be improved accordingly. Once the pleural effusion occurs, it is necessary to improve the examination under the guidance of physician as soon as possible, make a clear diagnosis, and take active treatment to avoid the progress of the disease.