Expanded Access Use of Stiripentol in Participants With Dravet Syndrome or Epileptic Encephalopathies Associated With Sodium Channel Mutations

The initial dose of Stiripentol will be determined by the prescribing neurologist and titrated up to an initial goal dose of 50 mg/kg/day divided into 2 to 3 doses per day. Further dose increases by 10-20 mg/kg/day increments up to a max of 100 mg/kg/day or 4000 mg total daily dose may be necessary for improved seizure control.

Stiripentol is available as gelatin capsules and powder sachets (250 mg, 500 mg). The same granule formulation (i.e. active, PVP and portion of sodium starch glycolate) used for the capsule is used in the final powder blend with a few additional excipients. Depending upon patient weight, the 250 mg or 500 mg formulation will be utilized for each participant.

Caretakers will be queried about common adverse effects including drowsiness, tremor, ataxis, nausea, anorexia, weight loss, and emesis. Intolerable adverse effects will prompt dose reduction or withholding medication.

Monitoring of these and other potential AEs will occur during study visits and participant-initiated telephone calls throughout the study. Safety events and tolerability will be recorded as adverse events (AE) or serious adverse events (SAE).

Physical examination, weight, vital signs, and laboratory tests (cbc, complete metabolic panel, and AED levels) will be conducted at baseline and at least every 6 months and as clinically warranted.