Azithromycin-250 and Azithromycin-500 tablets - Antibiotics and Antibacterials

Azithromycin is an azalide, a subclass of macrolide antibiotics.

Azithromycin is one of the world's best-selling antibiotics, sold in the US under the name Zithromax as well as under generic labels. It is derived from erythromycin; however, it differs chemically from erythromycin in that a methyl-substituted nitrogen atom is incorporated into the lactone ring, thus making the lactone ring 15-membered.

Azithromycin is used to treat or prevent certain bacterial infections, most often those causing middle ear infections, tonsillitis, throat infections, laryngitis, bronchitis, pneumonia, Typhoid, and sinusitis. In recent years it has primarily been used to prevent bacterial infections in infants and those with weaker immune systems. It is also effective against certain urinary tract infections and venereal diseases, such as non-gonococcal urethritis, chlamydia, gonorrhea and cervicitis. Recent studies have also indicated it to be effective against late-onset asthma, but these findings are controversial and not widely accepted.