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Effects of Kampo extracts on drug metabolism in rat liver microsomes: Rhei Rhizoma extract and Glycyrrhizae Radix extract inhibit drug oxidation.

In the present study, the effects on drug oxidations in rat liver microsomes in vitro using 126 Kampo extracts were investigated. Although the effects of inhibition on drug oxidations were dependent on the Kampo extracts and probe reactions studied, most of the Kampo extracts showed inhibitory effects on both N-demethylations of aminopyrine and erythromycin in rat liver microsomes. Among the Kampo extracts studied herein, Daio-kanzo-to exhibited the most remarkable inhibitory effect on both reactions. The Rhei Rhizoma extract inhibited not only aminopyrine and erythromycin N-demethylations, but also phenacetin O-deethylation, 7-ethoxycoumarin O-deethylation, ethanol oxidation and tolbutamide 4-hydroxylation in rat liver microsomes. The Glycyrrhizae Radix extract also showed a remarkable inhibitory effect on phenacetin O-deethylation as well as aminopyrine and erythromycin N-demethylations. In contrast, the Glycyrrhizae Radix extract virtually showed no effect on ethanol oxidation.