Increased risk of hyperkalaemia w/ aliskiren, K-salts, K-sparing diuretics, ACE inhibitors, angiotensin II receptor antagonists, NSAIDs, heparins, immunosuppressants, trimethoprim, co-trimoxazole. Increased risk of worsened renal function & CV morbidity & mortality w/ aliskiren. Increased risk of severe anaphylactoid reactions w/ extracorporeal treatments. Increased risk of angioedema w/ sacubitril/valsartan, estramustine, racecadotril, mTOR inhibitors (eg, sirolimus, everolimus, temsirolimus), gliptins (eg, linagliptin, saxagliptin, sitagliptin, vildagliptin). Reversible increased lithium serum conc & toxicity. Higher frequency of hypotension, syncope, hyperkalaemia & worsened renal function w/ ACE inhibitor & angiotensin-receptor blocker. Lethal ventricular fibrillation & CV collapse w/ verapamil & dantrolene IV. Increased bioavailability w/ grapefruit or grapefruit juice. Increased antihypertensive effect w/ baclofen. Attenuated antihypertensive effects, increased risk of worsening of renal function & increased serum K w/ NSAIDs eg, ASA, COX-2 inhibitors & non-selective NSAIDs. Increased blood-glucose lowering effects w/ antidiabetics eg, insulin, oral hypoglycemics. Hypotensive effects w/ non-K-sparing diuretics. Risk of hypokalaemia w/ Torsade de pointes-inducing drugs. Additive effect w/ IV amphotericin B, systemic gluco- & mineralocorticoids, tetracosactide, stimulant laxatives. Favoured toxic effects of cardiac glucosides w/ low K levels. Increased hypersensitivity reactions to allopurinol. Significant increased amlodipine exposure w/ CYP3A4 inhibitors eg, PIs, azole antifungals, macrolides eg, erythromycin or clarithromycin, verapamil, diltiazem. Increased risk of hypotension w/ clarithromycin. Increased antihypertensive effect & risk of orthostatic hypotension w/ imipramine-like antidepressants eg, TCAs, neuroleptics. Additive BP-lowering effect w/ other antihypertensives. Reduced antihypertensive effect w/ corticosteroids, tetracosactide; sympathomimetics. Reduced BP w/ nitroglycerin & other nitrates or vasodilators. Increased risk of leucopenia w/ allopurinol, cytostatic or immunosuppressive agents, systemic corticosteroids or procainamide. Enhanced hypotensive effects of anaesth. Vol depletion & risk of hypotension w/ thiazide or loop diuretics. Nitritoid reactions w/ injectable gold (Na aurothiomalate). Lactic acidosis w/ metformin. Increased risk of acute renal insufficiency w/ high-dose iodinated contrast media. Increased levels of Ca. Increased creatinine level w/ ciclosporine. Increased tacrolimus blood levels. Increased exposure of mTOR inhibitors. Increased exposure to simvastatin.