pentobarbital will decrease the level or effect of estropipate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Bildskärm.pentobarbital will decrease the level or effect of irinotecan liposomal samhälle affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Skärm.pentobarbital increases toxicity of ifosfamide by