Genetically epilepsy prone rat (GEPR) is a model of generalized tonic/clonic epilepsy and a useful tool in the understanding of basic mechanisms of human epilepsy. GEPR is susceptible to audiogenic seizure, hyperthermia induced seizure,and has lower threshold for electrical and chemical stimuli. Several strains of GEPR, from GEPR-3 to GEPR-9, are available depending on the degree of the intensity of audiogenic seizure.