Which statement best defines tocolysis?

• A. Medication to stop preterm contractions
• B. Medication to speed labor
• C. Medication to treat infection
• D. Medication to promote placental perfusion

Answer: (B)

Tocolysis involves giving medications to stop or suppress uterine contractions in a preterm pregnancy, with the goal of delaying birth so the fetus can mature further and safer delivery can be arranged. The idea is to buy time for interventions like antenatal steroids to help lung development and for the mother and baby to be in a setting where care can be optimized if birth becomes inevitable. This is why the statement that defines tocolysis is a medication approach to stop preterm contractions. It is not about speeding labor, which would be the opposite purpose; it is not about treating infection, which would require antibiotics or other infection-specific management; and it is not about promoting placental perfusion, which involves different strategies aimed at improving blood flow to the placenta. In practice, clinicians choose tocolytics to pause contractions only under appropriate conditions and with awareness of contraindications, such as infection, fetal distress, or other obstetric complications.