<qa>  What is the dose of magnesium sulfate usually given to patients?Magnesium sulfate is generally given to patients to protect the mother against seizures in the case of preeclampsia. Different hospitals in the United States use different doses of magnesium sulfate. Participants will receive one of two accepted doses of magnesium sulfate for preeclampsia. The dose is usually 4g - 6g at the start, with another dose of 2-3 g every hour until 24 hours after delivery. Participants will be assigned to either a dose of 4 g at the start, followed by 1g every hour; or a dose of 6 g at the start, followed by 2g every hour until treatment for preeclampsia is complete. Participants will receive magnesium sulfate in the course of their normal clinical care whether or not they participate in this study. 