Increased peak plasma & trough conc of digoxin. May increase serum K w/ K sparing diuretics (eg, spironolactone, eplerenone, triamterene, or amiloride), K supplements, or K-containing salt substitutes. Reversible increases in serum lithium conc & toxicity. Antihypertensive effect may be reduced w/ NSAIDs (ie, ASA at inflammatory dose regimens, COX-2 inhibitors & non-selective NSAIDs). May result in further deterioration of renal function, including possible acute renal failure, w/ COX inhibitors in some patients w/ compromised renal function (eg, dehydrated patients or elderly). Increased AUC
0-24 & C
max of ramipril & ramiprilat. May result in vol depletion w/ prior treatment w/ high-dose diuretics eg, furosemide (loop diuretic) & hydrochlorothiazide (thiazide diuretic) & in risk of hypotension when initiating therapy. BP-lowering effect can be increased w/ other antihypertensive medicinal products. Higher frequency of adverse effects (eg, hypotension, hyperkalaemia & decreased renal function including acute renal failure) associated w/ dual blockade of the RAAS through combination w/ ACE inhibitors or aliskiren. Hypotensive effects may be potentiated w/ baclofen, amifostine. Orthostatic hypotension may be aggravated w/ alcohol, barbiturates, narcotics, or antidepressants. Reduced antihypertensive effect of corticosteroids (systemic use).