Pregnancy induced hypertension (PIH) is classified according to the severity of hypertension. The Japan Society of Hypertension made practice guidelines in 2014, and the Japan Society for the Study of Hypertension in Pregnancy made guidelines subsequently in 2015, too. Both guidelines state that the basic treatment for PIH is the interruption of pregnancy, and antihypertensive therapy should be given for protection in mother complicated by severe hypertension. The fetal heart rates should be monitored enough due to worsening fetal circulation. It recommends that methyldopa, hydralazine, labetalol, and long-acting nifedipine (only after 20 weeks of gestation) should be used as the first-choice antihypertensive oral drugs. Intravenous administration should be selected when a hypertensive emergency occurs.
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