Is Curcumin Safe with Tamoxifen?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid high-dose curcumin supplements while taking tamoxifen. Inform your oncologist before starting any curcumin or turmeric supplement. Do not discontinue tamoxifen without medical guidance.
Why this interaction occurs
Tamoxifen requires CYP2D6-mediated conversion to its active metabolite endoxifen for therapeutic efficacy. Curcumin inhibits CYP2D6, potentially reducing endoxifen levels and compromising breast cancer treatment outcomes, particularly in patients who are already CYP2D6 intermediate metabolizers.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 22,724 reports mentioning Tamoxifen. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Tamoxifen + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Curcumin interactions → · All Tamoxifen interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.