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Interactions between herbal and conventional medicines.

Elizabeth M Williamson1

  • 1The School of Pharmacy, University of Reading, PO Box 228, Whiteknights, Reading, Berkshire, RG6 6AJ, UK. E.M.Williamson@reading.ac.uk

Expert Opinion on Drug Safety
|March 30, 2005
PubMed
Summary

Reliable data on herb-drug interactions is scarce due to variability in herbal medicines. Few herbs, like St. John's Wort, interact with common drugs such as warfarin.

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Area of Science:

  • Pharmacology
  • Herbal Medicine
  • Drug Interactions

Background:

  • Herb-drug interactions are of significant interest but often lack reliable evidence.
  • Herbal medicines' variable composition and quality impact their interaction profiles and reporting accuracy.

Purpose of the Study:

  • To collate, evaluate, and summarize clinical and experimental reports on herb-drug interactions.
  • To explain challenges in comparing herbal medicines with conventional drugs.
  • To provide perspective and recommendations for healthcare professionals.

Main Methods:

  • Systematic review of clinical and experimental reports on herb-drug interactions.
  • Evaluation of theoretical and clinical evidence.
  • Analysis of specific issues related to herbal medicine interactions.

Main Results:

  • Only a limited number of herbal drugs (e.g., St. John's Wort, Ginkgo biloba, garlic) are frequently cited in interaction reports.
  • Interactions primarily involve conventional drugs already prone to interactions (e.g., warfarin, protease inhibitors, anti-cancer drugs).

Conclusions:

  • Healthcare professionals need strategies to manage herb-drug interactions without speculation.
  • Evidence-based guidance is crucial for patient safety concerning herbal medicine use.

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