For treatment of bronchitis, severe Campylobacter enteritis, chancroid diphtheria, Legionnaire's disease and other Legionella infections, neonatal conjunctivitis, pertussis pneumonia (mycoplasmal and other atypical pneumonias as well as Streptococcal), sinusitis and combined with neomycin, for the prophylaxis of surgical infection in patients undergoing bowel surgery, uncomplicated Chlamydial urethritis, cervicitis or pharyngitis. Azithromycin may also be used as a component of regimens in the treatment of Mycobacterium avium complex (MAC) infections and may be used for prophylaxis.