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Updated: Jun 22, 2026
11:06
Human Liver Microphysiological System for Assessing Drug-Induced Liver Toxicity In Vitro
Published on: January 31, 2022
Kava hepatotoxicity: regulatory data selection and causality assessment.
1Department of Internal Medicine II, Division of Gastroenterology and Hepatology, Klinikum Hanau, Teaching Hospital of the Johann Wolfgang Goethe-University, Frankfurt/Main, Hanau, Germany. rolf_teschke@klinikum-hanau.de
Summary
Regulatory data on kava hepatotoxicity was found to be selective and of low quality. Quantitative causality analysis showed no concordance with the regulatory assessment, suggesting a need for reevaluation.
Area of Science:
- Pharmacology
- Hepatology
- Herbal Medicine Safety
Background:
- Kava (Piper methysticum) is an herbal anxiolytic remedy.
- Kava hepatotoxicity has been debated globally following German regulatory actions.
- Twenty patient cases from Germany formed the basis of the regulatory assessment.
Purpose of the Study:
- To quantitatively assess causality between kava use and liver disease in 20 reported cases.
- To evaluate the quality of data presented by the German regulatory agency.
- To compare quantitative causality assessment with the regulatory ad hoc evaluation.
Main Methods:
- Utilized the updated Council for International Organizations of Medical Sciences (CIOMS) scale for causality assessment.
- Performed a quantitative structured causality analysis on all 20 patient cases.
- Evaluated the quality and completeness of the regulatory data presentation.
Main Results:
- Regulatory data was scattered, selective, and lacked essential information like exclusion of independent causes.
- Quantitative causality assessment classified kava's role as possible (n=2), unlikely (n=12), or excluded (n=6).
- Results showed no concordance with the German regulatory agency's ad hoc causality evaluation.
Conclusions:
- The regulatory data on kava hepatotoxicity is of low quality and selective, not supporting the proposed causality.
- The findings suggest the regulatory data may explain broader discussions on kava hepatotoxicity.
- Recommended the regulatory agency to report data in full and reevaluate causality.
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