A nurse is assisting in the care of a client who is experiencing a postpartum hemorrhage. Which of the following medications should the nurse plan to administer?

A. Terbutaline: Terbutaline is a beta-agonist used to relax the uterus in cases of preterm labor or to manage uterine hyperstimulation, which would worsen postpartum bleeding. It is contraindicated in postpartum hemorrhage because it inhibits uterine contractions needed to control bleeding. B. Methylergonovine: Methylergonovine is a uterotonic medication that stimulates sustained uterine contractions, promoting uterine tone and helping to control postpartum hemorrhage. It is used when hemorrhage results from uterine atony and is contraindicated in clients with hypertension or preeclampsia due to vasoconstrictive effects. C. Magnesium sulfate: Magnesium sulfate is used primarily for seizure prophylaxis in preeclampsia and for tocolysis in preterm labor. It relaxes smooth muscle, including the uterus, which would exacerbate postpartum bleeding rather than treat it. D. Nifedipine: Nifedipine is a calcium channel blocker used as a tocolytic to inhibit preterm labor. It decreases uterine contractions and is therefore inappropriate for managing postpartum hemorrhage, as it would reduce uterine tone and increase bleeding risk.