Azithromycin is an antibiotic used to treat various bacterial infections, including respiratory infections, skin infections, and sexually transmitted diseases. It works by stopping the growth of bacteria, helping the body to fight off the infection. Azithromycin is often prescribed in a convenient dosing schedule, which may involve taking it for just a few days. This medication is part of the macrolide class of antibiotics and is commonly known by its brand name, Zithromax. It is usually taken orally in the form of tablets or liquid, and it can also be given intravenously in more severe cases. As with any medication, it is important to follow a healthcare provider's instructions when using azithromycin.