Zithromax is an antibiotic medication that belongs to a class of drugs known as macrolides. It is commonly used to treat various bacterial infections, including respiratory infections, skin infections, and certain sexually transmitted diseases. The active ingredient in Zithromax is azithromycin, which works by inhibiting the growth of bacteria, allowing the body's immune system to eliminate the infection. Zithromax is typically taken orally in the form of tablets or liquid suspension. It is important to complete the full course of treatment as prescribed by a healthcare provider, even if symptoms improve before finishing the medication. This helps prevent the development of antibiotic-resistant bacteria.