Tocolytics are medicines that are used to slow or stop the contractions of a woman's uterus during pregnancy. They are typically given to women who are in preterm labor to try to delay birth for 1 to 2 days.
This delay may be needed for a variety of medical reasons, such as:
Examples of tocolytics include terbutaline, magnesium sulfate, nifedipine, and indomethacin.
WebMD Medical Reference from Healthwise