ribociclib will improve the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism.lumacaftor/ivacaftor will minimize the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism.Observe Closely (1)ferric maltol, fentanyl. Both boosts levels of your other by unspecified interaction mechanism