Final answer:
Nifedipine is prescribed to a client diagnosed with preterm labor as a tocolytic to relax the uterus and inhibit contractions, delaying premature delivery and allowing for additional fetal development.
Step-by-step explanation:
A client diagnosed with preterm labor has been prescribed nifedipine, which is a medication primarily used as an antihypertensive agent due to its ability to relax the smooth muscles of the blood vessels, resulting in vasodilation and lowering of blood pressure. In the context of preterm labor, nifedipine is used as a tocolytic medication to relax the smooth muscles of the uterus. By doing so, it helps to inhibit contractions and delay premature delivery, which provides additional time for fetal development, potentially leading to a better outcome. The nurse should explain the use of nifedipine in a clear and supportive manner to help the client understand the importance of this medication in managing their condition.