The ability of azithromycin to treat bronchiectasis depends mainly on the cause of bronchiectasis. Azithromycin is clinically indicated for bacterial infections, as well as for diseases caused by pathogens such as mycoplasma, chlamydia, and rickettsia, which can be treated with azithromycin. Most bronchitis and bronchiectasis are mainly caused by viral infections and do not require antibiotic treatment because antibiotics are ineffective against viruses and the misuse of antibacterial drugs can cause bacterial resistance. If antibacterial treatment is really needed, the available sensitive drugs become less. Treatment can usually be symptomatic or combined with antiviral treatment, such as antiviral therapy with drugs such as oseltamivir and cytarabine. Chinese preparations, such as ichthyococcus and panacea, can also be chosen. Azithromycin is used to treat infections caused by mycoplasma and chlamydia, and the course of treatment usually needs to reach about two weeks. For common bacterial infections, the course of treatment is usually 5-7 days.