Azithromycin should be taken during the fourth week of pregnancy to closely observe the fetus and to do regular labor tests as scheduled. Azithromycin belongs to pregnancy class B drugs, there is no human fetus using the drug a large number of case reports or rigorous control studies, azithromycin through the placenta less than 3% of the amount of the mother’s body, there is almost no adverse reactions reported on the human body, the use of the dose is higher than the dose of the clinical application of animal reproduction studies, did not see the drug has an adverse effect on the fetus or have toxic side effects. After taking azithromycin in the fourth week of pregnancy, closely observe the condition of the fetus, do the follow-up obstetric examination, especially the detector test, if there is any discomfort, you should go to the hospital in time to improve the relevant examination, and standardize the treatment under the guidance of the doctor.