Why is Magnesium Sulfate the first-line medication for preeclampsia/eclampsia? How did that arise into the current, international, standard-of-care regiment for that condition? Is 24 hours of Postpartum Mag evidence-based? In this episode we will review the evolution of magnesium sulfate for eclampsia prevention/treatment. We will also summarize a soon to be released systematic review and meta-analysis publication from Obstetrics & Gynecology examining the duration of postpartum MagSulfate use.