Azithromycin is an antibiotic that fights bacteria. Azithromycin is used to treat many different types of infections caused by bacteria, such as respiratory infections, skin infections, ear infections, and sexually transmitted diseases. Azithromycin may also be used for purposes not listed in this medication guide.
Zithromax is an antibiotic that is a derivative of erythromycin which belongs to the macrolide class of drugs. Zithromax treats quite a number of infections ranging from upper respiratory tract infections, otitis media and acute sinusitis to more serious infections such as community acquired pneumonia if administered with other drugs and sexually transmitted infections secondary to gonoccocal infection.