QTc interval prolongation: Prolongued due to the effect on K channels which delay depolarisation.
Risk of sudden death by torsades de points VF.
HIGH RISK: thioridazine, properidol, pimozide, ziprasidone
Assess for dizziness, syncope, presyncope, palpitations
HIGH RISK: long QT interval, IHD, CCF, LVF, family history of arrhythmias, (perform baseline ecg and avoid high risk meds)