Close monitoring of renal function, electrolytes & BP if dual blockade of renin-angiotensin-aldosterone system is necessary. Patients on haemodialysis. May increase blood urea & serum creatinine in patients w/ bilateral renal artery stenosis or stenosis of the artery to a solitary kidney. Patients who have undergone renal transplant. Hypotension may occur in hypertensive patients w/ intravascular vol depletion such as receiving high dose diuretics. Anaesth & surgery. Haemodynamically relevant aortic or mitral valve stenosis, or obstructive hypertrophic cardiomyopathy. Not recommended in patients w/ primary hyperaldosteronism. Periodic monitoring of serum K in patients w/ heart failure. Concomitant therapy w/ ACE inhibitor in heart failure; concomitant use w/ K-sparing diuretics, K supplements, salt substitutes containing K, or other medicinal products that may increase K levels (eg, heparin, co-trimoxazole). Treatment w/ other medicinal product affecting renin-angiotensin-aldosterone system in patients whose vascular tone & renal function depends on the system activity (eg, patients w/ severe CHF or underlying renal disease, including renal artery stenosis), may cause acute hypotension, azotaemia, oliguria or, rarely, acute renal failure. Pregnancy & lactation. Childn w/ GFR <30 mL/min/1.73 m
2.