Reduced bioavailability with sucralfate, antacids containing magnesium or aluminium, vitamin or mineral supplements containing iron. Increased serum levels with cimetidine. Potential increase in serum levels of ciclosporin. Renal elimination reduced with probenecid.
Potentially Fatal: Increased risk of ventricular arrhythmias with class IA (quinidine, procainamide) or class III (amiodarone, sotalol) antiarrhythmic agents.