If the effect is not particularly good and a combination of drugs is needed, we will choose to use nifedipine, which is taken orally. If the blood pressure is particularly high and needs to be intravenous, there are nitroglycerin, sodium nitroprusside, phentolamine and so on. High blood pressure can lead to spasm of the small arteries of the mother, which can also cause problems in the kidney function of the pregnant woman. Eclampsia, convulsions, and spasms of the placental arteries can lead to fetal hypoxia and intrauterine growth retardation. In severe cases, placenta abruptio may occur, and if it does, the baby will be deprived of oxygen or even at risk of life.