Butabarbital will lower the level or impact of levonorgestrel oral/ethinylestradiol/ferrous bisglycinate by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Observe Closely. The efficacy of hormonal contraceptives may be lessened. butabarbital will reduce the level or influence of midazolam by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Ke... https://terryy420hkl4.loginblogin.com/profile