Erythromycin is indicated for mycoplasma pneumonia, neonatal conjunctivitis caused by Chlamydia trachomatis, infant pneumonia, genitourinary tract infections (including non-gonococcal urethritis), legionellosis, diphtheria (adjuvant therapy) and diphtheria carriers, skin soft tissue infections, pertussis. Respiratory tract infections (including pneumonia) caused by sensitive bacteria (H. influenzae, Streptococcus pneumoniae, Streptococcus hemolyticus, Staphylococcus, etc.), streptococcal pharyngitis, Listeria monocytogenes infection, long-term prophylaxis of rheumatic fever and prevention of endocarditis, Campylobacter jejuni enteritis, as well as gonorrhea, syphilis, acne, etc. are the main treatment directions of erythromycin.