<prompt> Which of the following statements about anti-epileptics is false?Phenytoin and carbamazepine act by prolonging the inactivated state of Na channelsCarbamazepine can be used in trigeminal neuralgiasDiazepam is an anticonvulsant drugLamotrigine mainly acts by causing GABA mediated Cl- channel opening  <response>: prolongation of Na channel inactivation and suppression of high frequency firing has been demonstrated. In addition, it may directly block voltage sensitive Na channels, thus stabilizing the presynaptic membrane and preventing release of excitatory neurotransmitters, mainly glutamate and aspaate. Ref KD Tripati 8thh ed. 