Azithromycin is an antibiotic. It's widely used to treat chest infections such as pneumonia, infections of the nose and throat such as sinus infection (sinusitis), skin infections, Lyme disease, and some sexually transmitted infections.
Clarithromycin is used to treat certain bacterial infections, such as pneumonia (a lung infection), bronchitis (infection of the tubes leading to the lungs), and infections of the ears, sinuses, skin, and throat.
Moxifloxacin hydrochloride is an antibiotic prescription medicine approved by the U.S. FDA for the treatment of certain bacterial infections, such as acute worsening of chronic bronchitis, acute sinus infections, community-acquired pneumonia, plague, and skin and abdominal infections.
Sparfloxacin is a fluoroquinolone antibiotic used in the treatment of bacterial infections.