INDICATIONS AND USAGE ZITHROMAX is a macrolide antibacterial drug indicated for mild to moderate infections caused by designated, susceptible bacteria: Acute bacterial exacerbations of chronic bronchitis in adults (1.1) Acute bacterial sinusitis in adults (1.1) Uncomplicated skin and skin structure infections in adults (1.1) Urethritis and cervicitis in adults (1.1) Genital ulcer disease in men (1