The fastest native remedies for cough with phlegm are not true. Cough with phlegm should be treated scientifically for the cause of the disease, and at the same time combined with the clinical symptoms of symptomatic treatment. 1. Treat the cause: (1) If the cough with phlegm is caused by bronchitis and pneumonia due to respiratory bacterial infection, you can take antibiotics such as amoxicillin and cefadroxil for treatment. (2) If it is a pathogenic bacterial infection such as mycoplasma chlamydia, you can take azithromycin, roxithromycin and other macrolide antibiotics. (3) If it is Mycobacterium tuberculosis infection, anti-tuberculosis drugs such as rifampicin and pyrazinamide should be chosen. (4) If allergic cough is caused by allergy, antihistamines such as loratadine and cetirizine can be taken. 2. Symptomatic treatment: On the basis of the treatment for the cause of the disease, if there is phlegm in the cough, you can choose expectorant drugs, such as bromhexine hydrochloride, guaifenesin and other drugs. Cough with phlegm, it is recommended to go to the hospital in time to check the cause of the disease, drugs need to be used under the guidance of a professional doctor, to avoid abuse of drugs.