SeriousConflict
St. John's Wort potently induces CYP3A4 and P-glycoprotein, both of which are major pathways for apixaban metabolism and transport. This induction can reduce apixaban plasma levels by 50% or more, potentially rendering the anticoagulant ineffective and increasing the risk of thromboembolic events.
Recommendation: Avoid combining St. John's Wort with apixaban. The FDA and EMA both list strong CYP3A4 inducers as contraindicated with DOACs. Discuss alternative mood support options with your prescriber.
ModerateCaution
Curcumin has antiplatelet properties that may increase bleeding risk when combined with apixaban. While no direct pharmacokinetic interaction has been established, the additive effect on hemostasis through different mechanisms warrants caution.
Recommendation: Use low-dose curcumin cautiously with apixaban. Avoid high-dose curcumin supplements. Watch for signs of unusual bleeding or bruising and report them to your healthcare provider.
ModerateCaution
Fish oil has antiplatelet and antithrombotic properties that may increase bleeding risk when combined with apixaban. While moderate doses are likely safe for most patients, higher doses (above 3g/day) create a more significant additive bleeding risk.
Recommendation: Low-to-moderate dose fish oil (1-2g/day) can generally be used with apixaban under medical supervision. Avoid high doses. Report any unusual bleeding or bruising to your healthcare provider.
ModerateCaution
NSAIDs increase the bleeding risk when combined with DOACs through antiplatelet effects and GI mucosal irritation. While DOACs have fewer food/drug interactions than warfarin, NSAID co-use remains a significant risk factor.
Recommendation: Minimize concurrent use. If pain relief is needed, prefer acetaminophen. If NSAID is necessary, use the lowest dose for the shortest time and monitor for bleeding signs.
SeriousCaution
Ginkgo biloba inhibits platelet-activating factor and platelet aggregation. Case reports document spontaneous bleeding (intracranial, ocular, postoperative) with ginkgo, particularly when combined with antithrombotics. Adding ginkgo to apixaban stacks an antiplatelet effect on top of factor Xa inhibition, raising bleeding risk.
Recommendation: Avoid ginkgo biloba while taking apixaban. If you have been combining the two, stop the ginkgo and call your prescriber if you notice unusual bruising, nosebleeds, or any sign of bleeding.
ModerateCaution
Concentrated garlic extracts inhibit platelet aggregation via allicin and related organosulfur compounds and have been linked to surgical bleeding. Adding garlic supplements to apixaban stacks antiplatelet activity on top of factor Xa inhibition, raising bleeding risk. Culinary garlic is not a concern.
Recommendation: Avoid concentrated garlic supplements (aged garlic extract, allicin capsules) while on apixaban, and stop them at least 7 days before any planned surgery. Garlic used in cooking is fine.
DangerousCaution
Nattokinase is a fibrinolytic enzyme that degrades fibrin and reduces clotting factor levels. Combined with apixaban's factor Xa inhibition, the additive effects substantially raise bleeding risk. Case reports describe intracerebral and intra-abdominal hemorrhage when nattokinase is added to other antithrombotics.
Recommendation: Do not combine nattokinase with apixaban. If you have been taking both, stop the nattokinase and call your prescriber, especially if you notice unusual bruising or bleeding.
ModerateCaution
Quercetin inhibits CYP3A4 and P-glycoprotein in vitro. Apixaban is metabolised by CYP3A4 and is a P-gp substrate, so high-dose quercetin supplements could raise apixaban plasma concentrations and bleeding risk. The interaction is plausible but human data are limited.
Recommendation: Avoid high-dose quercetin supplements (500 mg or more daily) on apixaban. Dietary intake from fruits and vegetables is not a concern. If you take a supplement, watch for unusual bruising or bleeding and tell your prescriber.
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