Co- administration af darifenacin 7, 5 mg og den potente CYP3A4 hæmmer ketoconazol 400 mg, resulterede i 5 gange så høj AUC for darifenacin ved steady- state.
Co-administration of darifenacin 7.5 mg with the potent CYP3A4 inhibitor ketoconazole 400 mg resulted in a 5-fold increase in steady-state darifenacin AUC.