Combination requiring precautions for use: Torsades de pointes-inducing medicines, NSAIDs, ACE inhibitors. Combination to be taken into consideration: K-sparing diuretics (eg, amiloride, spironolactone, triamterene), metformin, iodinated contrast media, imipramine-like antidepressants, neuroleptics, Ca (salts), ciclosporin, tacrolimus, corticosteroids, tetracosactide.