fosphenytoin will decrease the extent or result of diazepam by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Watch.Check Carefully (one)crofelemer improves amounts of diazepam by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Check. Crofelemer has the probable to inhibit CYP3A4 at concentrations expected