<prompt> Which antiepileptic drug can lead to this adverse effect:PhenytoinCarbamazepineValproateLamotrigine  <response>: Ans. A PhenytoinThe figure shows the gum hypertrophy which is caused by phenytoinThe mechanism of action of antiepileptic drugsMain mechanismDrugNa Channel blockersPhenytoinCarbamazepineLamotrigineValproateStimulate GABA-BZD Cl channel complesBarbituratesBenzodiazepinesInhibit GABA transaminaseVigabatrinInhibit GAT-1TiagabineAct on SV2ALevetiracetamOpen K ChannelsRetigabineBlock NMDA receptorsFelbamateBlock AMPA receptorsPerampanelBlock L type Ca ChannelsEthosuximide 