The drug azithromycin belongs to the group of drugs known as macrolide antibiotics. It acts by preventing bacterial development. Colds, the flu, or other viral diseases cannot be treated with antibiotics like azithromycin.

Certain bacterial infections, including bronchitis, pneumonia, sexually transmitted diseases (STDs), infections of the ears, lungs, sinuses, skin, throat, and reproductive organs are treated with azithromycin. Disseminated Mycobacterium avium complex (MAC) infection, a form of lung infection that frequently affects patients with human immunodeficiency virus (HIV), is another condition for which azithromycin is used to treat or prevent.  Azithromycin 500 mg tablet is in a class of medications called macrolide antibiotics. It works by stopping the growth of bacteria.