What happens when you take apixaban with St. John's wort?
Apixaban (Eliquis) is a direct oral anticoagulant that blocks Factor Xa to prevent and treat blood clots. It depends on two body systems to stay at the right level in your blood: the liver enzyme CYP3A4 breaks it down, and the P-glycoprotein (P-gp) pump moves it out of cells. St. John's wort (Hypericum perforatum) speeds up both at once, and that is what causes the problem.
- St. John's wort switches on a master regulator. Its active compound, hyperforin, activates the pregnane X receptor (PXR), a control switch that tells the body to make more drug-clearing machinery.
- Both of apixaban's exit routes get busier. PXR activation increases production of CYP3A4 and P-glycoprotein together. Because apixaban relies on both, inducing them at the same time has an outsized effect.
- Apixaban leaves the bloodstream faster. The body breaks the drug down more quickly and pumps it out more aggressively, so its blood level can drop below the protective range even though you are still taking the full prescribed amount.
- The effect builds over a week or two. Enzyme and transporter levels rise gradually with regular St. John's wort use, so the loss of protection is not immediate and not obvious.
- Clot protection quietly weakens. The end result is a weaker anticoagulant effect at a time when you and your prescriber believe the medication is fully working.
Why is this important?
Apixaban is prescribed for high-stakes reasons: preventing strokes in atrial fibrillation, treating deep vein thrombosis and pulmonary embolism, and preventing clots from coming back. If its blood level falls too low, the consequence can be a stroke or a dangerous clot.
This is one of the few herb-drug interactions named directly on the medication's own FDA-approved label. The Eliquis label advises avoiding apixaban with strong dual inducers of CYP3A4 and P-gp, and it lists St. John's wort alongside drugs such as rifampin, carbamazepine, and phenytoin.
What makes this combination especially worth taking seriously is that apixaban is given at fixed doses without routine blood monitoring. With warfarin, an INR blood test would flag under-anticoagulation early. With apixaban there is no such early-warning test, so a person can feel completely well right up until a clot or stroke occurs.
What should you do?
The core principle is simple: do not take St. John's wort while you are on apixaban. How you act depends on your timing.
Before starting apixaban: If you currently take St. John's wort and are about to begin apixaban, tell your prescriber. Because enzyme and transporter levels take roughly one to two weeks to return to normal after stopping the supplement, your prescriber may want you to stop St. John's wort ahead of your first apixaban dose.
Every day while on apixaban: Take apixaban exactly as prescribed and avoid St. John's wort in any form, including mood, stress, sleep, and general wellness products. Check labels for Hypericum perforatum, hypericin, or hyperforin. Learn the warning signs of inadequate clot protection: sudden one-sided weakness, facial droop, slurred speech, vision changes, a severe sudden headache, chest pain, sudden shortness of breath, or new swelling in one leg. Any of these warrants immediate emergency care.
After a change: If you have already been taking apixaban and started St. John's wort, do not stop either one on your own. Contact your prescriber, who can decide on the safest path. For depression specifically, evidence-based prescription options and non-drug approaches such as cognitive behavioral therapy, behavioral activation, and exercise can be discussed as safer alternatives alongside apixaban.
Which specific products are affected?
On the medication side, this applies to apixaban under the brand name Eliquis and its generic versions, across the approved strengths. The same CYP3A4/P-gp induction concern applies, in differing degrees, to the other direct oral anticoagulants: rivaroxaban (Xarelto), dabigatran (Pradaxa, mainly via P-gp), and edoxaban (Savaysa, Lixiana).
On the supplement side, the ingredient to avoid is St. John's wort, which may be listed as Hypericum perforatum, hypericin, or hyperforin. It appears in standardized extracts as well as in many mood-support, stress-relief, sleep, and general wellness blends. Standardized extracts are the most potent inducers, but lower-grade preparations should also be avoided.
The science behind it
The strongest evidence comes from the drug's own regulatory documentation. The ELIQUIS (apixaban) U.S. Prescribing Information instructs that apixaban should be avoided with strong dual inducers of CYP3A4 and P-glycoprotein because they reduce apixaban exposure and can increase the risk of stroke and other thromboembolic events; St. John's wort is named explicitly among these inducers.
Independent professional drug references agree. The Drugs.com professional interaction report for apixaban plus St. John's wort flags the combination on the same mechanism: induction of CYP3A4 and P-gp lowering apixaban concentrations and weakening its anticoagulant effect.
The mechanism itself, hyperforin acting through the pregnane X receptor to induce CYP3A4 and P-glycoprotein, is well established for St. John's wort across many medications, which is why the concern carries over consistently to apixaban.
Frequently Asked Questions
Can I take St. John's wort with Eliquis if I keep the doses small?
No. The concern is not about apixaban's dose but about St. John's wort speeding up apixaban's removal from your body. Even regular use of the supplement can lower your protection, so it should be avoided rather than adjusted.
Will I feel it if my apixaban stops working?
Usually not. There is no routine blood test for apixaban and no symptom that tells you your level has dropped. The first sign can be a clot or stroke, which is exactly why avoiding the interaction matters.
I just realized I have been taking both. What should I do?
Do not stop either one on your own. Contact your prescriber or pharmacist promptly so they can guide the safest adjustment.
How long does St. John's wort keep affecting apixaban after I stop it?
The enzyme and transporter levels it raised take roughly one to two weeks to return to normal, so the effect does not disappear the moment you stop the supplement. Tell your prescriber so timing can be planned.
Are other blood thinners safer with St. John's wort?
The other direct oral anticoagulants share the same type of concern to varying degrees. Any change of blood thinner or supplement should be made with your prescriber, not on your own.
Is there a safer option than St. John's wort for low mood while on apixaban?
Yes. Several evidence-based prescription treatments and non-drug approaches such as cognitive behavioral therapy and exercise can be discussed with your doctor as safer choices alongside apixaban.
Key takeaways
- St. John's wort speeds up apixaban's breakdown and clearance, which can lower its blood level and weaken clot protection.
- This is one of the few herb-drug interactions named directly on apixaban's own FDA-approved label as a substance to avoid.
- Apixaban is dosed without routine blood monitoring, so reduced protection is silent until a clot or stroke occurs.
- Do not take St. John's wort while on apixaban, and check supplement labels for Hypericum perforatum, hypericin, or hyperforin.
- If you are already taking both, do not stop either on your own; review with your doctor or pharmacist promptly.