Increased risk of angioedema w/ ACE inhibitors. Higher frequency of adverse events eg, hypotension, hyperkalemia & decreased renal function (including acute renal failure) w/ aliskiren. Should not be co-administered w/ another ARB containing product. Increase systemic exposure of OATP1B1 & OATP1B3 substrates (eg, statins). Greater BP reduction w/ PDE5 inhibitors (eg, sildenafil). Increased serum K & creatinine w/ K-sparing diuretics (eg, triamterene, amiloride), mineralocorticoid antagonists (eg, spironolactone, eplerenone), K supplements, salt substitutes containing K or other agents (eg, heparin). Increased risk of worsening of renal function w/ NSAIDs & COX-2 inhibitors. Reversible increases in serum lithium conc & toxicity. Reduced C
max & AUC of furosemide & metformin. Nitrates eg, nitroglycerine. May increase the systemic exposure w/ inhibitors of OATP1B1, OATP1B3, OAT3 (eg, rifampicin, ciclosporin), OAT1 (eg, tenofovir, cidofovir) or MRP2 (eg, ritonavir).