As with other antimuscarinics, fesoterodine should be used with caution in patients with risk for QT- prolongation (e. g. hypokalaemia, bradycardia and concomitant administration of medicines known to prolong QT interval) and relevant pre-existing cardiac diseases (e. g. myocardial ischaemia, arrhythmia, congestive heart failure), (see section 4.8).