GI absorption may be interfered w/ antacids containing Ca, Mg, Al; sucralfate, didanosine, metal cations (eg, Fe) & multivit prep w/ Zn. Potential additive effect on QT interval prolongation w/ class Ia (eg, quinidine, procainamide) or III (eg, amiodarone, sotalol) antiarrhythmics; fluoxetine or imipramine. Blood glucose disturbances including hyperglycemia & hypoglycemia w/ antidiabetics. Possible increased AUC of ciclosporin or tacrolimus. Risk of tendon rupture may be increased w/ corticosteroids particularly in the elderly. Episode of torsades de pointes w/ fluconazole in patient on hemodialysis. May increase risk of CNS stimulation & convulsive seizures w/ NSAIDs. Potential increased AUC & t
1/2 w/ probenecid & cimetidine. Prolonged elimination t
1/2 & elevated serum levels of theophylline. Enhanced effects of warfarin.