ATM XL

Azithromycin is a semisynthetic macrolide antibiotic belonging to the azalide subclass, derived from erythromycin, and characterized by its broad-spectrum activity against many gram-positive bacteria, some gram-negative bacteria, and atypical pathogens.[1] With a molecular formula of C₃₈H₇₂N₂O₁₂ and a molecular weight of 749.00, it is formulated as a white crystalline powder and is available in oral tablets, oral suspension, and intravenous preparations.[2] First approved by the U.S. Food and Drug Administration (FDA) in 1991 under the brand name Zithromax, azithromycin revolutionized antibiotic therapy due to its extended half-life of approximately 68 hours, enabling convenient short-course regimens such as 3- to 5-day treatments or single-dose administration for certain infections.[2]