butabarbital will reduce the extent or result of levonorgestrel oral/ethinylestradiol/ferrous bisglycinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Check Intently. The efficacy of hormonal contraceptives could possibly be lowered.butabarbital will lower the level or outcome of glecaprevir/pibrentasvir by impacting he… Read More