 Following randomization, patients will be managed as per the standard labor and delivery protocol for preeclampsia in that institution. The only restrictions will be that no other anti-seizure medications apart from the study agents will be given unless the patient is removed from the study. Use of non seizure-related drugs used will be recorded on the case report. The enrollment of patients in the study will not, other than in the choice of the anti-seizure agent, influence the obstetrical management of the patient. Routine hourly vital signs and fetal heart rate monitoring will be employed. A standardized case report form will be used for all study patients. 