Evaluation of Herb–Drug Interactions of Hovenia dulcis Fruit Extracts

BACKGROUND Hovenia dulcis (Rhamnaceae) fruits are popularly used as herbal medicines or dietary supplements in Asian countries due to functions such as liver protection and detoxification from alcohol poisoning. Accordingly, it is very likely for dietary supplemental products, including H. dulcis fruit extracts, to be taken with prescription drugs. OBJECTIVE In this study, possible food-drug interactions involving H. dulcis fruit extracts were evaluated based on the inhibition of cytochrome P450 (CYP) enzyme activity. MATERIAL AND METHODS The water extract of H. dulcis fruit extracts was incubated in human liver microsomes with CYP-specific substrates. The formation of the CYP-specific metabolites was measured using liquid chromatography-tandem mass spectrometry. RESULTS H. dulcis fruit extracts showed negligible effects on seven CYP isozyme activities at all concentrations tested. CONCLUSION This result suggests that H. dulcis fruit extracts may have minimal pharmacokinetic interactions with coadministered drugs through the modulation of CYP enzymes. SUMMARY Food-drug interactions involving H. dulcis fruit extracts were evaluated.The inhibition of CYPs by H. dulcis extracts was tested.H. dulcis extracts showed negligible effects on CYP activities.H. dulcis extracts may have minimal pharmacokinetic interactions with co-administered drugs. Abbreviations Used: CYP: cytochrome P450 enzymes, HPLC: High performance liquid chromatography, LC-MS/MS : liquid chromatography-tandem mass spectrometry, MRM: multiple-reaction monitoring.