Antiepileptic drugs and mechanisms of epileptogenesis. A review.

This paper analyzes the effect of conventional (phenobarbital, phenytoin, carbamazepine, ethosuximide, valproate) and some novel (vigabatrin, lamotrigine, felbamate) AEDs on some basic mechanisms involved in focal and/or generalized epileptogenesis (Na+ voltage-dependent channels and sustained repetitive firing, L-, N-, and T-type Ca2+ currents, GABA-mediated inhibition, Glu/Asp-mediated excitation, after-hyperpolarization). According to this analysis, AEDs can be divided into two main categories, those with only one specific action and those with multiple actions. A speculative correlation is proposed between AED effects on the mechanism of epileptogenesis and their known clinical effect on seizures.