<prompt> Drug preferred in generalized tonic clonic seizure:PhenytoinNa ValproateCarbamazepineDiazepam  <response>: Ref: Katzung, 14th ed. pg. 426; KDT 6th ed. pg. 407-408 Given the choices the answer will be Na Valproate According to Harrisons 19th ed. the current recommendable drug of choice for GTCS is LAMOTRIGINE Na Valproate. 