Oral azithromycin is mainly for inflammation caused by mycoplasma infection, the course of mycoplasma is usually about 2-3 weeks, but it also depends on age, immune function and the severity of the infecting pathogens. If your child still coughs after 4 days of oral azithromycin, you can continue to take symptomatic oral medication to relieve phlegm and cough. If the child’s cough is still severe, the child can be taken to the hospital for further treatment by intravenous infusion if necessary. If the child’s symptoms improve significantly after 4 days of oral azithromycin, oral erythromycin or roxithromycin can also be given to continue the consolidation treatment.