Pneumonia is a common and frequent disease of the respiratory system, often due to bacterial, viral, mycoplasma, chlamydia and other infections caused by inflammation of the lungs. Azithromycin is a macrolide antibiotic, which is effective against mycoplasma, chlamydia and common bacteria. Patients with pneumonia can use Azithromycin if Mycoplasma and Chlamydia infections are considered. If it is considered to be caused by viruses, fungi, etc., azithromycin is of little use. General bacteria, azithromycin has a certain effect, but the current resistance rate is also relatively high. Therefore, at present, if the clinical consideration of mycoplasma, chlamydia infection using azithromycin, if it is caused by other pathogens, routinely choose other classes of antibiotic treatment.