“…30 Current data suggest that clindamycin, oral cephalosporins, and fluoroquinolone-class antibiotics are associated with an increased risk of both community-acquired and hospital-acquired C difficileassociated disease. 31,32 Cardiotoxicity of fluoroquinolones is well described in adults and relates to the propensity of such drugs to prolong the QT interval through blockage of the voltagegated potassium channels, especially the rapid component of the delayed rectifier potassium current I(Kr), expressed by HERG (the human ether-a-go-go-related gene). Moxifloxacin has the greatest risk to prolong the QT interval and should be avoided in patients with long QT syndrome, those with hypokalemia or hypomagnesemia, those with organic heart disease including congestive heart failure, those receiving an antiarrhythmic agent from class Ia or class III (eg, quinidine and procainamide or amiodarone and sotaolo, respectively), those who are receiving a concurrent drug that prolongs the QTc interval independently, and those with hepatic insufficiency-related metabolic derangements that may promote QT prolongation.…”