You can use Picrotoxin in dose of 3.5 mg/kg, S.C. for Mice and observe the symptoms like Clonic seizure, Tonic seizure and Death during next 30 minutes...
For more reference, here I have attached that Book also which give idea about all type of animal models of Epilepsy and all other diseases...
However our animals didn't convulse with 7.5mg/kg of PCTX....and no mortality after 24h was observed! (both in control postive, negative and in substance treated animals)