Decreased exposure w/ rifampicin, carbamazepine, phenobarb, phenytoin, St. John's wort, P-gp & BCRP inducers. Rapid & significant decreased plasma conc w/ cholestyramine or activated charcoal. Increased mean C
max & AUC of repaglinide, paclitaxel, pioglitazone, rosiglitazone, ethinylestradiol, levonorgestrel, cefaclor, benzylpenicillin, ciprofloxacin, indometacin, ketoprofen, furosemide, cimetidine, MTX, zidovudine, rosuvastatin, topotecan, sulfasalazine, daunorubicin, doxorubicin, simvastatin, atorvastatin, pravastatin, nateglinide. Decreased mean C
max & AUC of caffeine. Reduced efficacy of duloxetin, alosetron, theophylline, tizanidine. Decreased peak INR w/ warfarin.