α - receptor blocker can dilate the

α - receptor blocker can dilate the resistance vessels and volume vessels around, ensure the blood flow of coronary artery and increase the cardiac output, not only effectively reduce blood pressure, but also ensure the blood perfusion of important organs and placenta; β - receptor can prolong the conduction time of atrioventricular junction, reduce heart rate, prevent tachycardia and reduce the oxygen consumption of myocardium. Therefore, rabeprolol can dilate blood vessels and reduce blood pressure by directly acting on blood vessels, but it does not affect the blood flow of placenta. It also has the function of anti platelet aggregation and promoting fetal lung maturity. It is generally used in the treatment of moderate and severe pregnancy induced hypertension syndrome