Magnesium sulfate and Ritodrine, both of which can serve the purpose of suppressing contractions and appropriately prolonging the gestational week. Because the drugs have their own different indications, so can not say which drug treatment contractions better. 1. magnesium sulfate: magnesium sulfate has the role of fetal preservation, mainly through the role of magnesium ions, with the release of spasm, inhibit the role of uterine smooth muscle, can control eclampsia seizures, prolonging the gestational week. However, long-term use of magnesium sulfate may cause fetal bone decalcification, resulting in neonatal fracture, if the pregnant woman suffers from myasthenia gravis and renal failure, magnesium sulfate should be prohibited. 2. Ritodrine: Ritodrine is a β-adrenergic receptor agonist, which can act on the β2 receptor of uterine smooth muscle to inhibit the contraction of uterine smooth muscle, and can be used to prevent preterm labor after 20 weeks of pregnancy. It can cause side effects such as hypokalemia and constipation in pregnant mothers and tachycardia and hypoglycemia in fetuses. It is prohibited for use in eclampsia, etc. All of the above drugs should be used under the guidance of a doctor, avoid unauthorized use of drugs to avoid adverse effects. If a pregnant woman experiences contractions, it is recommended that she consult a doctor in time, complete the relevant examinations, and choose the appropriate medication to achieve the purpose of suppressing contractions.