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You are here: Home » Products Listed by Brand » McKesson Products » Drug Reference (A's) » Azithromycin for Injection


Zithromax contains the active ingredient azithromycin, an azalide, a subclass of macrolide antibiotics, for intravenous injection. Azithromycin has the chemical name (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-13-[(2,6-dideoxy-3-C-methyl-3-O-methyl-a-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)-b-D-xylo-hexopyranosyl]oxy]- 1-oxa-6-azacyclopentadecan-15-one. Azithromycin is derived from erythromycin; however, it differs chemically from erythromycin in that a methyl-substituted nitrogen atom is incorporated into the lactone ring. Its molecular formula is C38H72N2O12, and its molecular weight is 749.00.

Azithromycin, as the dihydrate, is a white crystalline powder with a molecular formula of C38H72N2O12·2H2O and a molecular weight of 785.0.

Zithromax (azithromycin for injection) consists of azithromycin dihydrate and the following inactive ingredients: citric acid and sodium hydroxide. Zithromax (azithromycin for injection) is supplied in lyophilized form in a 10-ml vial equivalent to 500 mg of azithromycin for intravenous administration. Reconstitution, according to label directions, results in approximately 5 ml of azithromycin for intravenous injection with each ml containing azithromycin dihydrate equivalent to 100 mg of azithromycin.


CATEGORIES: Cervicitis; Infection, cervix; Infection, lower respiratory tract; Infection, skin and skin structures; Infection, urethra, nongonococcal; Mycobacterium avium complex; Pharyngitis, streptococcal; Pneumonia; Pneumonia, community-acquired; Tonsillitis; Urethritis, nongonococcal; FDA Class 1B ("Modest Therapeutic Advantage"); FDA Approved 1991 Nov; Pregnancy Category B; Top 200 Drugs

FDA Drug Classes: Macrolides


BRAND NAMES: Aruzilina; Arzomicin; Azadose; Azenil; Azimin; Azithral; Azitrocin; Azitromax; Aziwok; Aztrin; Setron; Tobil; Tromix; Ultreon; Zeto; Zifin; Zistic; Zithromax; Zitrim; Zitromax
(Foreign Brand names outside U.S. in italics)

Arzomicin (Peru)
Azadose (France)
Azenil (Israel)
Azimin (Colombia)
Azithral (India)
Azitrocin (Italy; Mexico)
Azitromax (Sweden)
Aziwok (Benin; Burkina-Faso; Ethiopia; Gambia; Ghana; Guinea; India; Ivory-Coast; Kenya; Liberia; Malawi; Mali; Mauritania; Mauritius; Morocco; Niger; Nigeria; Senegal; Seychelles; Sierra-Leone; Sudan; Tanzania; Tunia; Uganda; Zambia; Zimbabwe)
Aztrin (Indonesia)
Setron (Peru)
Tobil (Colombia)
Tromix (Colombia)
Ultreon (Germany)
Zeto (Israel)
Zifin (Indonesia)
Zistic (Indonesia)
Zitrim (Colombia)
Zitromax (Colombia; Ecuador; Italy; Peru; Spain)

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