Higher frequency of adverse events w/ combined use of ACE inhibitors, AIIA, or aliskiren. Increased risk of hyperkalaemia w/ aliskiren, K salts, K-sparing diuretics, ACE inhibitors, AIIA, NSAIDs, heparins, immunosuppressant agents eg, ciclosporine or tacrolimus, trimethoprim. Increased risk of hyperkalaemia, worsening of renal function & CV morbidity & mortality w/ aliskiren in diabetic or impaired renal patients. Increased risk of angioedema w/ sacubitril/valsartan. Increased antihypertensive effect w/ imipramine-like antidepressants, neuroleptics; other antihypertensive agents. Reduced antihypertensive effect w/ corticosteroids, tetracosactide. Perindopril/indapamide: Increased serum conc & toxicity of lithium. Increased antihypertensive effect w/ baclofen. Attenuation of antihypertensive effect w/ NSAIDs. Perindopril: Increased risk of angioedema w/ estramustine; racecadotril; mTOR inhibitors (eg, sirolimus, everolimus, temsirolimus); gliptins. Increased risk of hyperkalaemia w/ co-trimoxazole. Increased blood-glucose lowering effect of antidiabetic agents. Further reduction in BP w/ non-K-sparing diuretics; nitroglycerin & other nitrates, other vasodilators. Increased risk of leucopenia w/ allopurinol, cytostatic or immunosuppressive agents, systemic corticosteroids or procainamide. Enhanced hypotensive effects of certain anaesthetic drugs. Vol depletion & risk of hypotension w/ prior treatment w/ high dose diuretics. Reduced antihypertensive effects w/ sympathomimetics. Nitritoid reactions w/ injectable gold (Na aurothiomalate). Indapamide: Risk of hypokalaemia w/ Torsades de pointes-inducing drugs; amphotericin B (IV), glucocorticoids & mineralocorticoids (systemic), tetracosactide, stimulant laxatives. Cardiac glycoside-toxicity due to low K levels. Increased incidence of hypersensitivity reactions to allopurinol. Lactic acidosis due to metformin caused by possible functional renal insufficiency linked to loop diuretics. Increased risk of acute renal insufficiency w/ high doses of iodinated contrast media. Risk of increased levels of Ca. Risk of increased creatinine levels w/ ciclosporine. Amlodipine: Risk of hyperkalaemia-associated lethal ventricular fibrillation & CV collapse w/ IV dantrolene. Increased bioavailability w/ grapefruit or grapefruit juice. Possible lower plasma conc w/ CYP3A4 inducers. Possible increase in exposure w/ CYP3A4 inhibitors. Increased risk of hypotension w/ clarithromycin. Risk of increased blood levels of tacrolimus. May increase exposure of mTOR inhibitors (eg, sirolimus, temsirolimus, everolimus). Increased exposure of simvastatin. Possible trough conc increases of ciclosporine in renal transplant patients.