- Substrates of OATP1B1 and/or OATP1B3, including atrasentan, bosentan, ezetimibe, glyburide, irinotecan, repaglinide, rifampin, telmisartan, valsartan, and olmesartan, from Day 1 through the last dose of study drug. "Statins" (i.e., HMG CoA reductase inhibitors) may be continued, but subjects should be cautioned and observed for potential "statin"-related toxicity. Alternatively, subjects can abstain from statins for the duration of study drug dosing.