Zithromax is the brand name for the antibiotic drug azithromycin. There are several synonyms that can be used to refer to this drug, including Zmax, Azithromax, Azithrocin, Zitrocin, and Azinix. These names all refer to the same drug and are used interchangeably in the medical field. Azithromycin is commonly used to treat bacterial infections such as respiratory infections, skin infections, and sexually transmitted infections. This antibiotic works by stopping the growth of bacteria, allowing the body's immune system to fight off the infection. It is important to take Zithromax exactly as prescribed by a healthcare provider to ensure its effectiveness and prevent antibiotic resistance.