How many days does magnesium sulfate last for maintaining fetal viability?

Patient's question:

No

Doctor's answer:

Hello! Magnesium sulfate has the effect of relaxing smooth muscle spasm. The uterus is composed of smooth muscle. Using magnesium sulfate to maintain pregnancy is to relax the uterine muscle, thereby achieving the effect of maintaining pregnancy. It should not be used for more than five days for maintaining pregnancy.