Final answer:
Terbutaline (Brethine) and ritodrine (Yutopar) are tocolytic agents used to inhibit uterine contractions and delay premature labor. They are not used to stimulate labor or for pain relief during labor, and they do not increase blood pressure.
Step-by-step explanation:
Terbutaline (Brethine) and ritodrine (Yutopar) are tocolytic agents used to inhibit uterine contractions and delay premature labor. They work by relaxing the smooth muscles of the uterus, preventing it from contracting. These medications are commonly used in cases of preterm labor or when there is a risk of premature birth.
They are not used to stimulate labor or as analgesics for pain relief during labor. In fact, they have no analgesic properties and are not typically used for pain management during childbirth. Additionally, they do not directly increase blood pressure.