Butabarbital will lower the extent or influence of levonorgestrel oral/ethinylestradiol/ferrous bisglycinate by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Keep track of Closely. The efficacy of hormonal contraceptives can be minimized. butabarbital will lessen the level or influence of carvedilol by affecting hepatic enzyme CYP2C9/10 metabolism. Use Caution/... https://donaldd896tah6.thenerdsblog.com/profile