Azithromycin is using to treat certain bacterial infections, such as bronchitis; pneumonia; sexually transmitted diseases (STD); and infections of the ears, lungs, sinuses, skin, throat, and reproductive organs. Azithromycin also is using to treat or prevent disseminating Mycobacterium avium complex (MAC) infection [a type of lung infection that often affects people with human immunodeficiency virus (HIV)]. Azithromycin is in a class of medications called macrolide antibiotics. It works by stopping the growth of bacteria.

Antibiotics such as azithromycin will not work for colds, flu, or other viral infections. When they are not needed, using antibiotics increases your risk of getting an infection later that resists antibiotic treatment.