pentobarbital will lessen the level or result of fesoterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Observe.pentobarbital will reduce the extent or effect of oliceridine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Observe. If coadministration with a CYP3A4 inducer is necessary, consider risi