Keng spektrli antibiotik, makrolidlar guruhi, azalid. Bakteriostatik ta'sir ko'rsatadi. Ribosomalarning 50S subbirligi bilan bog'lanib, oqsil sintezini bostiradi, bakteriyalar o'sishi va ko'payishini sekinlashtiradi. Yuqori konsentratsiyalarda bakteritsid ta'sir ko'rsatadi. Tashqi va ichki hujayra patogenlariga qarshi faol. Gram-musbat mikroorganizmlarga qarshi faol: Streptococcus spp. (C, F va G guruhlari, eritromitsinga rezistent bo'lganlardan tashqari), Streptococcus pneumoniae, Streptococcus pyogenes, Streptococcus agalactiae, Streptococcus viridans, Staphylococcus epidermidis, Staphylococcus aureus; gram-manfiy bakteriyalar: Haemophilus influenzae, Moraxella catarrhalis, Bordetella pertussis, Bordetella parapertussis, Legionella pneumophila, Haemophilus ducreyi, Campylobacter jejuni, Neisseria gonorrhoeae va Gardnerella vaginalis; ayrim anaerob mikroorganizmlar: Bacteroides bivius, Clostridium perfringens, Peptostreptococcus spp., shuningdek, ichki hujayra patogenlari: Chlamydia trachomatis, Chlamydia pneumoniae, Mycoplasma pneumoniae, Mycobacterium avium kompleksi, Ureaplasma urealyticum, Treponema pallidum, Borrelia burgdorferi. Azitromitsin eritromitsinga chidamli gram-musbat bakteriyalarga nisbatan faol emas.