* use of any investigational agent within 28 days prior to study start * patients with active opportunistic infections * pregnant or lactating women * women of childbearing potential and male subjects not willing to use adequate contraception methods during the study period * hypersensitivity to azithromycin or other macrolides * concurrent medication with ergotamine, theophylline, digitalis * inability to swallow tablets

* use of any investigational agent within 28 days prior to study start * patients with active opportunistic infections * pregnant or lactating women * women of childbearing potential and male subjects not willing to use adequate contraception methods during the study period * hypersensitivity to azithromycin or other macrolides * concurrent medication with ergotamine, theophylline, digitalis * inability to swallow tablets

- use of any investigational agent within 28 days prior to study start - patients with active opportunistic infections - pregnant or lactating women - women of childbearing potential and male subjects not willing to use adequate contraception methods during the study period - hypersensitivity to azithromycin or other macrolides - concurrent medication with ergotamine, theophylline, digitalis - inability to swallow tablets

- use of any investigational agent within 28 days prior to study start - patients with active opportunistic infections - pregnant or lactating women - women of childbearing potential and male subjects not willing to use adequate contraception methods during the study period - hypersensitivity to azithromycin or other macrolides - concurrent medication with ergotamine, theophylline, digitalis - inability to swallow tablets