After taking azithromycin for three days and stopping for four days, if the treatment is not satisfactory, you should continue to take it or change the medication as prescribed by your doctor. If the treatment is not satisfactory, you can take it for three days and stop for four days, then take it for three days and stop for four days, and so on. Prolonged use of azithromycin requires testing of liver function. Azithromycin is mainly used for the treatment of otitis media, sinusitis, pharyngitis, tonsillitis and other upper respiratory tract infections caused by sensitive bacteria, as well as bronchitis, pneumonia and other lower respiratory tract infections. At the same time, it can be used to treat simple genital system infections caused by Chlamydia trachomatis and non-multi-drug resistant gonococcus. The main side effects of azithromycin include gastrointestinal reactions, which may include nausea, vomiting, and abdominal distension; some patients may experience a transient decrease in neutrophils, as well as elevated transaminases. Azithromycin is contraindicated in people who are allergic to azithromycin or any of the other macrolides. Medication should be administered under medical supervision.