pentobarbital will decrease the level or outcome of solifenacin by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep an eye on.pentobarbital will minimize the level or effect of dexamethasone by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Watch.pentobarbital will lower the extent or effect of fesoterodin