Azithromycin (Zithromax) 500MG is a macrolide-type antibiotic used for the treatment of many different types of infections caused by bacteria. It is used to treat ear infections, respiratory infections, sexually transmitted diseases, and skin infections. Available as both brand-name (Zithromax) and generic drug, this medicine contains Azithromycin as an active ingredient. It works effectively by preventing the formation and growth of infection-causing bacteria.