Hypertensive patients can use antihypertensive drugs such as methyldopa, labetalol, nifedipine and so on during the preparation for pregnancy, these drugs have no effect on the preparation for pregnancy, and they can still continue to take them even if the blood pressure is high after pregnancy. For those with severe elevated blood pressure, intravenous medication or a combination of medications can also be used, such as methyldopa + hydralazine together, or labetalol + hydralazine, labetalol + nifedipine, and so on together. These drugs may also have adverse reactions during use, for example, methyldopa may cause hypotension and fetal bradycardia, labetalol may cause hypoglycemia in newborns, nifedipine may inhibit contractions, and hydralazine may cause thrombocytopenia in newborns in addition to low blood pressure, so even if it is used, it should be used under the guidance of a doctor.