Azithromycin is an azalide, a subclass of macrolide antibiotics. Azithromycin 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 sold under the brand names Zithromax ("Zmax") and Sumamed, and is one of the world's best-selling antibiotics. Azithromycin is used to treat certain bacterial infections, most often bacteria causing middle ear infections, tonsillitis, throat infections, laryngitis, bronchitis, pneumonia and sinusitis. It is also effective against certain sexually transmitted infectious diseases, such as non-gonococcal urethritis and cervicitis.

Etymology

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Azithromycin's name is derived from the azane-substituent and erythromycin. Its accurate chemical name is

(2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-13- [(2,6-dideoxy-3-C-methyl-3-O-methyl -α-L-ribo-hexopyranosyl)oxy]-2-ethyl- 3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl -11-[[3,4,6-trideoxy-3-(dimethylamino) -β-D-xylo-hexopyranosyl]]oxy]-1-oxa- 6-azacyclopentadecan-15-one.

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