Azithromycin belongs to the macrolide class of drugs, which belongs to the same category as erythromycin, and is generally used for mycoplasma or chlamydia infections. The dose of azithromycin granules is 0.1g per sachet, which is taken for 3 days or 5 days, depending on the kg weight of the child. Macrolide drugs mainly have gastrointestinal side effects, such as nausea, vomiting, stomach discomfort, etc., so it is not recommended to take orally on an empty stomach, but after 1-2h after meals. Azithromycin has slightly less gastrointestinal reactions than erythromycin, so it is now more commonly used for the treatment of mycoplasma or chlamydia.