Levetiracetam, sold under brand names of Keppra, Elepsia, Epictal, Lenerve, Levepsy, Torleva (and many others) is a prescription-only anticonvulsant medication for epilepsy. It is used for partial onset, myoclonic, or tonic-clonic seizures. It is taken by mouth as an immediate or extended release formulation. There are currently more than 6 million prescriptions per year in the US alone.
Its mechanism of action is currently unknown.
See: Mechanisms of Levetiracetam in the Control of Status Epilepticus and Epilepsy Frontiers in Neurology 2014; 5: 11.