A cough that has been bad for a long time may be related to pneumonia, mycoplasma infection, allergic cough, postnasal drip syndrome, etc. Drugs such as sporocin sodium, aminoglutethimide, and montelukast sodium chewable tablets should be given according to the cause of the cough after it has been determined first. 1. Pneumonia: Pneumonia caused by bacterial infection, if the condition is more serious or not sensitive to the drugs used, there may be symptoms such as prolonged bad cough and coughing up sputum. Cefazolin sodium, levofloxacin or ampicillin can be applied under the guidance of the doctor. 2. Mycoplasma infection: Mycoplasma invasion leads to pneumonia or bronchitis patients, may be a long time coughing, because mycoplasma infection is relatively long course. You can follow the doctor’s instructions to apply sensitive antibiotics, azithromycin or roxithromycin and other drugs to treat. 3. Allergic Cough: Allergic cough is caused by contact with allergens in people with allergic constitution, and if you can’t get rid of the allergens, you may not get better for a long time. You should get rid of the allergens as soon as possible and avoid contact with allergic substances. Ketotifen tablets and other medications can be used as prescribed by the doctor. 4. Postnasal drip syndrome: sinusitis, rhinitis and other diseases, nasal secretions increase, nasal discharge backflow, irritation of the throat may appear cough has been bad symptoms. You can follow the doctor’s instructions to apply mometasone furoate nasal spray and other drugs. Cough has been bad for a long time, but also seen in tuberculosis, lung cancer, gastroesophageal reflux stimulation cough, cough variant asthma, eosinophilic bronchitis and many other diseases, should be examined and treated in the hospital.