Increased risk of severe anaphylactoid reaction w/ dialysis or haemofiltration w/ certain high-flux membranes & LDL apheresis w/ dextran sulphate. Hyperkalaemia w/ K salts, heparin, K-retaining diuretics, AIIA, trimethoprim, tacrolimus, ciclosporin. Potentiated risk of hypotension w/ antihypertensives & other substances decreasing BP (eg, nitrates, TCAs, anesth, acute alcohol intake, baclofen, alfuzosin, doxazosin, prazosin, tamsulosin, terazosin). Reduced antihypertensive effect w/ vasopressor sympathomimetics, isoproterenol, dobutamine, dopamine, epinephrine. Increased likelihood of haematological reactions w/ allopurinol, immunosuppressants, corticosteroids, procainamide, cytostatics & other substances affecting blood cell count. Increased lithium toxicity. Hypoglycaemic reactions w/ antidiabetic agents (ie, insulin). Reduced antihypertensive effect, increased risk of renal function worsening & increased kalaemia w/ NSAIDs & ASA.