Warfarin and food, herbal or dietary supplement interactions: A systematic review.

Br J Clin Pharmacol. 2020 Jun 01;:

Authors: Tan CSS, Lee SWH

AIMS: To present an updated overview on the safety of concurrent use of food, herbal or dietary supplement and warfarin.
METHODS: A systematic literature review was performed on 5 databases from inception until December 31st , 2019. These interactions were classified depending on the likelihood of interaction and supporting evidences.
RESULTS: A total of 149 articles describing 78 herbs, food or dietary supplements were reported to interact with warfarin. These reports described potentiation with 45 (57.7%) herbs, food or dietary supplements while 23 (29.5%) reported inhibition and 10 (12.8%) reported limited impact on warfarin pharmacokinetics and pharmacodynamics. Twenty unique herb and dietary supplements also reported to result in minor bleeding events, such as purpura and gum bleeding as well as major events such as intracranial bleeding that led to death.
CONCLUSION: While most food, herbs and supplements can be safely taken in moderation, healthcare professionals should be aware of the increased risk of bleeding when taking several food and herbs. These include Chinese wolfberry, chamomile tea, cannabis, cranberry, chitosan, green tea, ginkgo biloba, ginger, spinach, St. John’s Wort, sushi and smoking tobacco. Patients should be counselled to continue to seek advice from their healthcare professionals when starting any new herbs, food or supplement.

PMID: 32478963 [PubMed – as supplied by publisher]

Source: ncbi 2

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