While the question concerning an increased pro-arrhythmic effect of fluoxetine or risperidone monotherapy remains unanswered with contradictory evidence [3], [33] the combination with another QT-prolonging compound, such as oxytocin, could severely increase the risk for arrhythmia, especially by affecting different ion channels rather than the same. The gene discussed is OXT; the disease is Arrhythmia.