OBJECTIVE：To investigate the ro le of clinical pharmacists in the therapy of fetal tachycardia by oral administration of digoxin through mother. METHODS ：The clinical pharmacists participated in the whole process of drug therapy for a pregnant woman with fetal tachycardia. According to 31+6 weeks of gestation ，the fetal heart rate of 230 beats/min at admission，clinical pharmacists provided the suggestion for the doctor about the safety and blood concentration determination of digoxin in the treatment of fetal tachycardia by mother. The patient ’s blood potassium value was lower than the normal range ，and it was suggested that potassium should be supplemented before digoxin was used ，and the initial dose of digoxin was 0.5 mg per 12 h. On the 7th day in the hospital ，the dosage of digoxin should be adjusted to maintaining dose （0.25 mg per 12 h）；on the 11th day in the hospital ，the patient ’s blood sodium value was low ，and the clinical pharmacists gave diet guidance. At the same time ， the clinical pharmacists explained the adverse reactions of digoxin to the doctors ，nurses and patients ，and closely observed and educated the patients. RESULTS ：Doctors adopted the suggestions of the clinical pharmacists. The fetal heart rate decreased to 180 beats/min from hospital after 13 days of treatment. The maternal digoxin concentration remained stable. No adverse drug reactions occurred in the mother and infant. CONCLUSIONS ：Maternal and child safety should be taken into account in the medication of pregnant patients. The clinical pharmacists assisting doctors to formulate medication strategying ，and carrying out pharmaceutical care for patients ，can ensure the effectiveness and safety of medication for fetal tachycardia.