Consequently, the drug is contraindicated in patients that are likely to develop abnormal heart rhythms; this includes persons that have had polymorphic ventricular tachycardia in the past, have a long QT interval, sick sinus syndrome, or a recent myocardial infarction, among others.
The drug's use is restricted in patients susceptible to abnormal heart rhythms; this encompasses individuals with a history of polymorphic ventricular tachycardia, a prolonged QT interval, sick sinus syndrome, or a recent myocardial infarction.