<prompt> Concomitant use of valproic acid and lamotrigine increases the risk of :Chondrodysplasia punctataParoxysmal Nocturnal hemoglobinuriaStevens-Johnson syndromeFloppy infant syndrome  <response>: Stevens-Johnson syndrome Concomitant use of valproic acid and lamotrigine increases the plasma level of lamotrigine and increases the risk of Stevens-Johnson syndrome; hence, lamotrigine should be staed as a low dose with gradual escalation. 