Discontinue immediately if symptoms of hepatitis occur (malaise, nausea, vomiting, abdominal colic, fever); if
C. difficile-associated diarrhea (CDAD) is suspected or confirmed; if allergic reaction occurs. Arrhythmias, ventricular tachycardia, hypotension, QT prolongation & Torsades de Pointes. Serious allergic reactions, including angioedema, anaphylaxis, & dermatologic reactions, including SJS & TEN. Risk of fungal or bacterial superinfection, including CDAD w/ prolonged use. Patients at risk of prolonged cardiac repolarization; w/ myasthenia gravis. Consider avoiding use in patient w/ prolonged QT interval, uncorrected hypokalemia or hypomagnesemia, clinically significant bradycardia, or concurrent use of class IA (eg, quinidine, procainamide) or class III (eg, amiodarone, dofetilide, sotalol) antiarrhythmic agents. Patients w/ GFR <10 mL/min. Renal & hepatic impairment. Pregnancy & lactation.