Azithromycin (developed by Pliva) is used to treat certain bacterial infections, most often the bacteria causing middle ear infections, tonsillitis, throat infections, laryngitis, bronchitis, pneumonia and sinusitis. Azithromycin is an azalide, which is a subclass of macrolide antibiotics. Azithromycin (brand names Zithromax? in Italy; Vinzam?/Zitromax? in Spain; Zmax?; Sumamed?; Aztrin?) is one of the world's best-selling antibiotics, and is derived from erythromycin; however, it differs che...