Study of Antiepileptic Drug in Generalised Convulsive Status Epilepticus

Inclusion criteria : * Age ≥ 18 years * Patient taken care by a prehospital medical team participating in the study * Diagnosis of tonicoclonic generalized status epilepticus confirmed on the spot by a physician of the team. Exclusion criteria : * Parent or the reliable person indicated by the patient present not giving its agreement for the inclusion * Pregnancy clinically detectable or known for close relations at the time of the status epilepticus * tonicoclonic generalized status epilepticus after anoxia post cardiac arrest * Patient having already received another treatment for the same episode of status epilepticus * Patient having already participated in the study during a previous episode of status epilepticus * Patient in "latent" status epilepticus. Definition : patient in the coma having epileptic demonstrations (CLONISMS MYOCLONISMS) small or invalid, contrasting with permanent generalized electric seizures on the EEG * Patient presenting certain diagnosis of pseudo name psychogenic seizure * Patient whose neurological status requires an immediate surgery (traumatism) * Patient having a hyper-responsiveness about the levetiracetam or about the other by-products of pyrrolidone or an one of the excipients * Patient having a hyper-responsiveness about the clonazepam, about the benzodiazepins or about one of the other constituents of the product * Patient under medical guardianship * Not membership in a schema of medical assurance.