<prompt> Drugs that do not increase QT interval: PGI Nov 2010AmiodaroneQuinidineDigitalisAmitryptyline  <response>: Ans: C Digitalis Digitalis cause shortening of QT interval- KDT 6th495Drugs that Prolong Q-T intervalAntiarrhythmicsQuinidineQ, procainamideQ, disopyramide. propafenone, AmiodaroneQ, SotalolAntimicrobialQuinine, mefloquine, artemisinin, halofan- trine, sparfloxacin, gatifloxacinAntihistaminicTerfenadineQ, astemizole, ebastineAntidepressantsAmitryptyline other tricyclicsAntipsych oticsThioidazine, risperidoneProkineticsCisaprideQ 