The antihistamine fexofenadine does not affect I-Kr currents in a case report of drug-induced cardiac arrhythmia

Abstract

1 The human HERG gene encodes the cardiac repolarizing K+ current I-Kr and is genetically inactivated in inherited long QT syndrome 2 (LQTS2). The antihistamine terfenadine blocks HERG channels, and can cause QT prolongation and torsades de pointes, whereas its carboxylate fexofenadine lacks HERG blocking activity.