Nifedipine is a calcium channel antagonist, has the effect of inhibiting contractions, thus can play a role in preserving the fetus. Nifedipine is a calcium channel antagonist, through the extracellular calcium ion inward flow, reduce the intracellular calcium ion concentration, to achieve the effect of inhibiting contractions, not only has the effect of preserving the fetus, but also a kind of antihypertensive drug. Therefore, while using nifedipine to protect the fetus treatment, pay attention to the detection of blood pressure, so as to avoid the occurrence of hypotension, causing adverse effects on the mother and child. If you are using magnesium sulfate for fertility preservation treatment, it is recommended not to use nifedipine for fertility preservation, because magnesium sulfate itself also has the effect of lowering blood pressure, in order to prevent the pregnant woman’s blood pressure from being too low. If pregnant women have preterm miscarriage or preterm labor, they can use nifedipine to preserve the fetus under doctor’s guidance, but they should pay attention to checking the blood pressure, and forbid to use magnesium sulfate treatment at the same time, use nifedipine to preserve the fetus, otherwise it will cause the blood pressure to be too low, which will cause serious adverse effects on the mother and child. If you have any other questions, it is recommended to consult a professional doctor for guidance.