Increased risk of hyperkalaemia w/ K salts, K-sparing diuretics (eg, triamterene, amiloride, eplerenone, spironolactone), NSAIDs, heparins, immunosuppressants (eg, ciclosporin, tacrolimus, trimethoprim), co-trimoxazole. Increased risk of hyperkalaemia, worsened renal function, CV morbidity & mortality w/ aliskiren. Increased frequency of hypotension, syncope, hyperkalaemia & worsened renal function w/ ACE inhibitors & AIIA. Increased risk of severe anaphylactoid reactions w/ extracorporeal treatments eg, dialysis or haemofiltration & LDL apheresis w/ dextran sulphate. Increased risk of angioedema w/ sacubitril/valsartan, estramustine, racecadotril, mTOR inhibitors (eg, sirolimus, everolimus, temsirolimus), gliptins (eg, linagliptin, saxagliptin, sitagliptin, vildagliptin). Reduced heart rate & cardiac output & vasodilation w/ centrally-acting antihypertensives eg, clonidine, methyldopa, moxonidine, rilmenidine. Potentiated AV conduction time & negative inotropic effect w/ class I antiarrhythmics eg, quinidine, disopyramide, lidocaine, phenytoin, flecainide, propafenone. Negative influence on contractility & AV conduction w/ verapamil- & diltiazem-type Ca antagonists. Reversible increased lithium serum conc & toxicity. Increased blood-glucose lowering effects w/ antidiabetics eg, insulin, oral hypoglycaemics. Attenuated antihypertensive effects w/ NSAIDs eg, acetylsalicylic acid, COX-2 inhibitors & non-selective NSAIDs. Increased hypotensive effects w/ antihypertensives, vasodilators (eg, nitroglycerin, other nitrates or vasodilators) or other medications w/ BP reducing potential (eg, TCAs, barbiturates, phenothiazines). Reduced BP w/ anaesth medicinal products, TCAs, antipsychotics. Reduced reflex tachycardia & increased risk of hypotension w/ anaesth. Reduced effects w/ β- & α-sympathomimetics. Increased risk of hypotension & ventricular pump function deterioration w/ dihydropyridine-type Ca antagonists eg, felodipine, amlodipine. Effect on AV conduction time may be potentiated w/ class III antiarrhythmics eg, amiodarone. May increase AV conduction time & risk of bradycardia w/ parasympathomimetics. Additive systemic effects w/ topical β-blockers. Reduced heart rate & increased AV conduction time w/ digitalis glycosides. Increased antihypertensive effects w/ baclofen. Risk of excessive BP reduction w/ non-K-sparing diuretics. Increased risk of bradycardia w/ mefloquine. Enhanced hypotensive effects & risk of hypertensive crisis w/ MAOIs (except MAO-B inhibitors). Nitritoid reactions w/ injectable gold (Na aurothiomalate).