pentobarbital will lower the level or outcome of nisoldipine by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Check.pentobarbital boosts effects of ifosfamide by influencing hepatic enzyme CYP2B6 metabolism. Use Caution/Check. Coadministration of ifosfamide with CYP2B6 inducers may maximize metabolism of ifosfamide to its met