A nurse is caring for a client who is receiving magnesium sulfate IV bolus for preeclampsia. The client's respiratory rate is 6/min and they have absent deep tendon reflexes. Which of the following medications should the nurse anticipate the provider to prescribe?

A. Dexamethasone: Dexamethasone is a corticosteroid used to promote fetal lung maturity in preterm labor or to reduce inflammation. It does not counteract magnesium sulfate toxicity and is not indicated for respiratory depression or absent reflexes. B. Methylergonovine: Methylergonovine is a uterotonic used to treat postpartum hemorrhage by stimulating uterine contractions. It does not reverse magnesium sulfate toxicity or address respiratory depression. C. Naloxone: Naloxone is an opioid antagonist used to reverse opioid-induced respiratory depression. Since the client’s symptoms are due to magnesium sulfate toxicity, naloxone would not be effective. D. Calcium gluconate: Calcium gluconate is the antidote for magnesium sulfate toxicity. It works by antagonizing the effects of magnesium on neuromuscular and cardiac function, helping to restore normal reflexes and improve respiratory function.