Used in conventional antiepileptic drugs can't satisfied control or intolerance to the limitations of the onset of epilepsy patients, and then the whole body and limitations attack of additional treatment in patients with epilepsy. An antiepileptic drug, prevent from chemicals (such as print out the toxin, pouch peony alkali,etc.) and non chemical stimuli, such as audio, electric shock, etc.) induced convulsion;It has an inhibitory effect on partial seizures and secondary generalized tonic-clonic seizures. It is an adjunctive therapy for partial seizures that cannot be satisfactorily controlled or tolerated by conventional anticonvulsants alone or in combination, as well as secondary systemic seizures to partial seizures