A Study to Investigate the Long-Term Safety of ZX008 (Fenfluramine Hydrochloride) Oral Solution in Children and Adults With Epileptic Encephalopathy Including Dravet Syndrome and Lennox-Gastaut Syndrome

This is an international, multicenter, open-label, long-term safety study of ZX008 in subjects with Dravet syndrome, Lennox-Gastaut syndrome or epileptic encephalopathy