PMID: 9429123Jan 16, 1998Paper

Antiepileptic drug cellular mechanisms of action: where does lamotrigine fit in?

Journal of Child Neurology
D A Coulter

Abstract

Current frontline antiepileptic drugs tend to fall into several cellular mechanistic categories, and these categories often correlate with the clinical spectrum of action of the various antiepileptic drugs. Many antiepileptic drugs effective in control of partial and generalized tonic-clonic seizures are use- and voltage-dependent blockers of sodium channels. This mechanism selectively dampens pathologic activation of sodium channels, without interacting with normal sodium channel function. Examples include phenytoin, carbamazepine, valproic acid, and lamotrigine. Many antiepileptic drugs effective in control of generalized absence seizures block low threshold calcium currents. Low threshold calcium channels are present in high densities in thalamic neurons, and these channels trigger regenerative bursts that drive normal and pathologic thalamocortical rhythms, including the spike wave discharges of absence seizures. Examples include ethosuximide, trimethadione, and methsuximide. Several antiepileptic drugs that have varying clinical actions interact with the gamma-amino-butyric acid (GABA)ergic system. Diazepam and clonazepam selectively augment function of a subset of GABAA receptors, and these drugs are broad-spectrum antiep...Continue Reading

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