The goal of these studies was to investigate potential drug-drug interactions between empagliflozin and gemfibrozil ( an organic anion-transporting polypeptide @B@ -LSB- OATP@B@ -RSB- / @B@ and organic anion transporter @ -LSB- OAT@ -RSB- inhibitor ) , rifampicin ( an OATP@B@/@B@ inhibitor ) , or probenecid ( an OAT@ and uridine diphosphate glucuronosyltransferase inhibitor ) .