Azithromycin is a more commonly used clinical antimicrobial, which is in the same family as erythromycin and tetracycline. It is mainly used in community-acquired pneumonia and pelvic inflammatory disease due to non-specific infections. It is often used by doctors and some patients because it does not require a skin test before use. Usually its main side effects are gastrointestinal. However, if the patient has cardiovascular disease, especially dysrhythmia, with ventricular dysrhythmia being the more serious, this drug should be used with caution. Because the recent international authoritative clinical journal “New England Medicine” published a paper, the study suggests that azithromycin than amoxicillin is more likely to promote cardiovascular disease in patients with death; another commonly used drugs that do not require a skin test of levofloxacin also have side effects in this regard; so the patient to use these drugs should be based on the advice of the doctor, can not be used blindly in the family.