Azithromycin is an antibiotic used to treat various bacterial infections. It is effective against conditions such as respiratory infections (like bronchitis and pneumonia), ear infections, skin infections, and sexually transmitted infections (such as chlamydia and gonorrhea). Azithromycin works by inhibiting bacterial protein synthesis, thereby stopping the growth and spread of bacteria. It is also used to treat sinus infections and throat infections. It is typically taken as a short course of treatment, often for 3 to 5 days. Always use azithromycin as prescribed by a healthcare provider to ensure its effectiveness and reduce the risk of resistance.