Answer
Ivabradine should be avoided in patients with congenital QT syndrome because its heart-rate reduction may exacerbate QT prolongation and cause severe arrhythmias, particularly Torsade de pointes.
Sources for this answer
- Ivabradine 5 mg Film-coated TabletsViatris (formerly Mylan or Upjohn) · emc · SmPC §4.4 Special warnings and precautions for use · Version 2Document updated
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