Monitor BP, serum creatinine K levels periodically. Patients whose vascular tone & renal function depend predominantly on the activity of the renin-angiotensin-aldosterone system, severe CHF; renal impairment; haemodialysis; unilateral or bilateral renal artery stenosis; patients w/ vol- & salt-depletion secondary to salt restriction, prolonged diuretic therapy, heart failure or dialysis; surgery/anaesth; aortic & mitral valve stenosis (obstructive hypertrophic cardiomyopathy); primary hyperaldosteronism; CHF; history of angioedema associated w/ or unrelated to ACE or angiotensin II receptor therapy. Avoid concomitant use w/ ACE inhibitor in heart failure patients & K-sparing diuretics. May affect ability to drive or operate machinery. Childn & adolescents <18 yr. Elderly >75 yr.