New derivative of 1,2,4-triazole-3-thione (TP427) potentiates the anticonvulsant action of valproate, but not that of carbamazepine, phenytoin or phenobarbital in the mouse tonic-clonic seizure model.

Background: To assess the effects of 5-(3-chlorobenzyl)-4-hexyl-2,4-dihydro-3H-1,2,4-triazole-3-thione (TP427) on the protective anticonvulsant action of four classical antiepileptic drugs (carbamazepine, phenobarbital, phenytoin and valproate) in the tonic-clonic seizure model in mice, an isobolographic transformation of data was used.

Methods: Electrically-induced tonic-clonic seizures were experimentally evoked in adult male albino Swiss mice. The anticonvulsant effects of TP427, when used singly, were determined by the calculation of the threshold increasing the dose by 20% (TID value).