Azithromycin granules is a kind of macrolide antibiotic, usually used in children, in the clinic azithromycin is commonly used for atypical pathogenic bacteria such as mycoplasma, chlamydia, legionella, which cause lung infections are more effective. Because these bacterial infections are often out-of-hospital infections, many community doctors recommend that those infected outside the hospital need to take azithromycin. Children infected by bacteria are definitely taking azithromycin granules, and oral granules need to be made into aqueous form, which is more suitable for children to take orally because of its fruity flavor. Azithromycin is widely used because it does not require a skin test and has fewer allergies. Especially in the years after SARS, azithromycin has been used in large quantities, resulting in many patients becoming resistant to azithromycin, so now azithromycin is not effective in hospitals for patients with infections. At present, clinical observation, azithromycin is not as good as when it was initially used, so azithromycin and the past old tetracycline, hygromycin is categorized as a class of drugs, but its side effects are much smaller than those drugs in the past.