Compounds that have been investigated in aliskiren clinical pharmacokinetic studies include acenocoumarol, atenolol, celecoxib, fenofibrate, pioglitazone, allopurinol, isosorbide-5-mononitrate, irbesartan, digoxin, ramipril, valsartan, metformin, amlodipine, atorvastatin, cimetidine and hydrochlorothiazide.