WebMD Answers
Tasigna can cause a possible life-threatening heart problem called QTc prolongation. QTc prolongation causes an irregular heartbeat, which may lead to sudden death.
Your doctor should check the electrical activity of your heart with a test called an electrocardiogram (ECG):
You may lower your chances for having QTc prolongation with Tasigna if you:
Food and grapefruit products increase the amount of Tasigna in your body.
Call your doctor right away if you feel lightheaded, faint or have an irregular heartbeat while taking Tasigna. These can be symptoms of QTc prolongation.
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