The more commonly used drugs to inhibit uterine contractions in mid-pregnancy are magnesium sulfate, atosiban, nifedipine and so on. If a woman has symptoms of preeclampsia in mid-pregnancy, she will need to use some drugs that inhibit uterine contractions under the guidance of her doctor to preserve her pregnancy. The more commonly used drugs mainly include the following: 1. magnesium sulfate. Magnesium sulfate is a calcium antagonist, can antagonize the calcium ions in the myometrium to inhibit uterine contractions, usually by intravenous drip, but to closely observe the adverse effects of the drug. 2. Atosiban. Atosiban is a receptor antagonist of contractin, which can inhibit the action of contractin, thus inhibiting uterine contraction and playing a role in preserving the fetus. 3. Nifedipine. Nifedipine is a calcium channel blocker, which can prevent calcium ions from entering the cell, and can also inhibit uterine contractions. The medication should be used under the guidance of a doctor, and should not be used on its own to avoid adverse effects.