pentobarbital will lower the extent or result of etravirine by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Keep an eye on.pentobarbital boosts effects of ifosfamide by influencing hepatic enzyme CYP2B6 metabolism. Use Warning/Observe. Coadministration of ifosfamide with CYP2B6 inducers might boost metabolism of ifosfamide to