Potential interaction w/ digoxin or carbenoxolone; antihypertensive medicines including ACE inhibitors; other diuretics; NSAIDs eg, aspirin, indomethacin, mefenamic acid, ibuprofen; K supplements; antipyrine; heparin or LMWH; medicines known to cause hyperkalaemia; trimethoprim & trimethoprim-sulfamethoxazole; anesth; abiraterone. Reduced responsiveness to noradrenaline.