The goal of these studies was to investigate potential drug-drug interactions between empagliflozin and gemfibrozil ( an organic anion-transporting polypeptide 1B1 [ OATP1B1 ] / 1B3 and organic anion transporter 3 [ OAT3 ] inhibitor ) , rifampicin ( an OATP1B1/1B3 inhibitor ) , or probenecid ( an OAT3 and uridine diphosphate glucuronosyltransferase inhibitor ) .