Hello! I know Tasigna can prolong the QT interval as can other drugs. I have had EKG's and after being on Tasigna for 19 months now I have never had a problem. Should I be worried about taking other drugs that can cause QT prolongnation with Tasigna if my EKG's are normal? I ask because I take Lexapro and also have taken some Promethazine codeine cough syrup that interacts because of the QT thing. Any thoughts?