Azithromycin is mainly used to treat bacterial infections caused by sensitive bacteria, such as various infections caused by Mycoplasma pneumoniae, Chlamydia pneumoniae, and Chlamydia trachomatis. This often requires 5 days of oral administration, and the dose should normally also be doubled on the first day. After 5 days of administration, the drug needs to be stopped for 5 days, and if the symptoms disappear, the drug can be stopped directly. If the symptoms do not disappear, you need to continue taking it for 5 days. If the symptoms are not relieved after 5 days, it means that azithromycin is not effective for the treatment of this kind of bacteria, you need to do a bacterial culture and drug sensitivity test, according to the type of infection and the results of the drug sensitivity test, choose the appropriate antibiotics to carry out treatment. Azithromycin has some stomach irritation when taken orally, which may cause loss of appetite and stomach pain. In the case of adults, it is best to take drugs to protect the gastric mucosa for treatment, such as oral omeprazole can be taken.