An Open Label, Expanded Access Protocol With SAGE-547 for Super-Refractory Status Epilepticus

Inclusion Criteria: * Subjects six (6) months of age and older * Subjects who have: * Failed to respond to the administration of at least one first-line agent (e.g., benzodiazepine or other emergent initial AED treatment), according to the institution's standard of care, and; * Failed to respond to at least one second-line agent (e.g., phenytoin, fosphenytoin, valproate, phenobarbital, levetiracetam or other urgent control AEDs), according to the institution's standard of care, and; * Not previously been administered a third-line agent but have been admitted to an intensive care unit with the intent of administering at least one third-line agent for at least 24 hours; or who have previously failed zero, one or more wean attempts from third-line agents and are now on continuous intravenous infusions of one or more third-line agents and in an EEG burst or seizure suppression pattern; or who have previously failed one or more wean attempts from third-line agents and are now either not on at least one continuous infusion of a third-line agent or are on one or more continuous infusions of third-line agents but not in an EEG burst or seizure suppression pattern. Exclusion Criteria: * Subjects with SRSE due to anoxic/hypoxic encephalopathy with highly malignant/ malignant EEG features * Children (subjects aged less than 18 years) with an encephalopathy due to an underlying progressive neurological disorder * Subjects who have any of the following: 1. a GFR low enough to warrant dialysis for whatever reason, but dialysis is not planned or non-continuous dialysis is planned; 2. severe cardiogenic or vasodilatory shock requiring two or more pressors that is not related to third-line agent use; 3. fulminant hepatic failure; 4. no reasonable expectation of recovery or life-expectancy of less than 30 days. * Subjects who are being administered more than three third-line agents concomitantly or in whom the qualifying wean cannot be completed per protocol