Antiemetics, are known to prolong the QTc interval
Antiemetics, are known to prolong the QTc interval: butyrophenone neuroleptic drugs ( droperidol and haloperidol ) 5-HT 3 receptor antagonists (ondansetron, granisetron, and dolasetron ) phenothiazines ( chlorpromazine and promethazine ) metoclopramide However, the scopolamine patch has not been demonstrated to significantly increase the QTc interval.