Rachel, a G1P0 female at 30 weeks’ gestation, was admitted to the facility due to persistent headaches. On physical assessment, a blood pressure of 180/130 mm Hg was noted. Laboratory tests were conducted, revealing proteinuria of more than 5 grams in a 24-hour collection. History reveals that Rachel was diagnosed with pre-eclampsia. Her physician orders the administration of magnesium sulfate IV to prevent convulsions. The nurse who is tasked with preparing and administering the drug ensures that which of the following medications is readily available as an antidote for magnesium sulfate toxicity?
