Increased risk of angioedema w/ ACE inhibitors. Potentially higher frequency of adverse events w/ aliskiren or another ARB. Increased systemic exposure of OATP1B1 & OATP1B3 substrates eg, statins. Greater BP reduction w/ sildenafil or other PDE5 inhibitor. Increased serum K & creatinine w/ K-sparing diuretics (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 in elderly patients, vol-depleted patients (including those on diuretic therapy), or patients w/ compromised renal function. Potential reversible increases in serum lithium conc & toxicity. Reduced C
max & AUC of furosemide & metformin. Increased systemic exposure of sacubitril active metabolite & valsartan w/ inhibitors of OATP1B1, OATP1B3, OAT3 (eg, rifampicin, ciclosporin), OAT1 (eg, tenofovir, cidofovir) or MRP2 (eg, ritonavir).