Quercetin and medications.
Quercetin is in the Distil supplement database, evidence Grade B. The page below lists every medication we have explicitly assessed it against.
Below are the 7 documented pairs we have explicitly assessed for Quercetin: 4 red and 3 amber. The pairs cluster around 2 mechanisms: CYP3A4 inhibition and Additive anticoagulation. Every call is cited to either a clinical reference (PMID) or the British National Formulary. Anything not listed here is either still to be assessed or beyond our database scope. The checker beneath surfaces assessments by medication, and the missing-item form at the bottom of the page routes any uncatalogued medication into our next curation pass.
Documented interactions
CYP3A4 inhibition
Quercetin can slow how the body clears ciclosporin, which may push ciclosporin blood levels higher than intended. We treat this as a do-not-combine pair outside direct transplant-team supervision.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Quercetin can slow how the body clears everolimus, which may push everolimus blood levels higher than intended. We treat this as a do-not-combine pair outside direct transplant-team supervision.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Quercetin can slow how the body clears sirolimus, which may push sirolimus blood levels higher than intended. We treat this as a do-not-combine pair outside direct transplant-team supervision.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Quercetin can slow how the body clears tacrolimus, which may push tacrolimus blood levels higher than intended. We treat this as a do-not-combine pair outside direct transplant-team supervision.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Quercetin may slow how the body clears atorvastatin via CYP3A4, which can raise atorvastatin levels. Watch for muscle pain or unusual fatigue and tell your GP if you take both regularly.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Quercetin may slow how the body clears simvastatin via CYP3A4. Because simvastatin is more sensitive to CYP3A4 inhibition than atorvastatin, the effect may be larger. Watch for muscle pain and tell your GP if you take both.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive anticoagulation
Quercetin may add to warfarin's blood-thinning effect at high doses. If you take warfarin, ask your GP before adding quercetin and monitor INR closely if you do.
What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope. Use the checker below to surface any medication, and submit a missing item if you take something we have not catalogued.
For adults over 18.
This tool gives evidence-graded information, not medical advice. Always discuss changes with your GP, pharmacist, or specialist before making them, especially if you take any medication, are pregnant, breastfeeding, or have a serious health condition.
How we grade severity, choose what's in scope, and what we exclude.
Every call on this page is reasoned. We publish the full rubric for severity tiers, the medication inclusion logic, the evidence grades we accept, and what we deliberately leave out. About three thousand words. Worth reading once if you use this tool more than occasionally.
Read the full methodologySomething missing?
If a supplement or medication you take isn't in our autocomplete, tell us and we'll add it in the next quarterly update.