Cough with phlegm can be seen in upper respiratory tract infection, pneumonia, chronic bronchitis, etc., need to be treated according to the cause of the disease, including drug treatment, lifestyle adjustment, etc.. 1. Upper respiratory tract infection: Symptomatic treatment is the mainstay, commonly used drugs include expectorants (such as Ambroxol), cough suppressants (such as dextromethorphan), and drinking plenty of water to ensure adequate water intake. 2. Pneumonia: anti-infection treatment is needed, such as penicillin, cephalosporin, azithromycin, etc. For the symptom of cough with phlegm, cough suppressant and expectorant can be applied to relieve the symptoms. 3. Chronic bronchitis: commonly used drugs include cough suppressants (such as codeine), expectorants (such as bromhexine), bronchodilators (such as aminophylline) and so on. If the infection is combined, antibiotics are needed for treatment, such as amoxicillin. However, it is important to note that the medication must be used under the supervision of a doctor, and should not be used on its own.