Which medication should a nurse plan to administer for a client experiencing postpartum hemorrhage?

In the context of managing postpartum hemorrhage, the most appropriate medication is Oxytocin. Oxytocin is a hormone that is commonly used to prevent and treat postpartum hemorrhage due to its ability to stimulate uterine contractions. These contractions help to compress blood vessels and reduce bleeding after childbirth.

Carboprost and Methylergonovine are also used in certain cases of postpartum hemorrhage, particularly when the bleeding is due to uterine atony. However, Oxytocin is typically the first-line medication because of its efficacy and safety profile. Magnesium sulfate is not indicated for the treatment of postpartum hemorrhage; it is primarily used for conditions like seizure prophylaxis in preeclampsia or to manage preterm labor. Therefore, the correct medication to plan for this situation would be Oxytocin, as it effectively addresses the primary cause of postpartum hemorrhage by promoting uterine contraction.