Fluoxetine and Apixaban: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Aug 8, 2026 · Source data updated Jul 11, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Fluoxetine
Apixaban
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Taking these two together can raise your risk of bleeding. Apixaban (Eliquis) is a blood thinner that helps prevent clots. Fluoxetine, an antidepressant, can also make it a little harder for your blood to clot on its own. Put together, they can add up and make bleeding more likely.
This does not mean you have to stop either one. But it is smart to watch for warning signs like unusual bruising, nosebleeds that won't stop, pink or red urine, black or bloody stools, or bleeding gums. If you notice heavy or unusual bleeding, get medical help right away. Your care team can safely manage this combination, so keep taking both as prescribed and talk with your pharmacist or doctor with any questions.
Mechanism: additive pharmacodynamic effect on hemostasis. Apixaban is a direct factor Xa inhibitor; SSRIs like fluoxetine impair platelet aggregation via serotonin depletion. Neither is a prodrug here; the effect is additive, not PK-mediated, and increases bleeding risk.
- Direction/magnitude: increased bleeding risk; magnitude not quantified.
- Evidence: theoretical; severity rated major.
- Onset: unspecified.
Management: No routine dose change mandated. Counsel on bleeding signs. Discontinue apixaban if active pathological hemorrhage occurs; anti-Xa activity persists roughly 24 hours post-dose. Reversal (andexanet alfa) is available; PCC, aPCC, or rFVIIa may be considered. Clotting assays are not reliable for guiding PCC reversal. Activated charcoal reduces apixaban absorption.
What happens
An increased risk of bleeding and can cause serious, potentially fatal bleeding
Interaction Deep Dive
Using apixaban, a factor Xa inhibitor, together with agents that influence hemostasis, including SSRI therapy, raises bleeding risk. Should active pathological bleeding develop, apixaban should be stopped. A reversal agent for the anti-factor Xa activity of apixaban is on the market. Apixaban's pharmacodynamic action is anticipated to remain for a minimum of 24 hours following the final dose. Patients should be counseled on the signs and symptoms of blood loss and instructed to report them without delay or present to an emergency room. In patients experiencing active pathological hemorrhage, apixaban should be discontinued. A reversal agent for the anti-factor Xa activity of apixaban is available. Apixaban's pharmacodynamic effect can be expected to last for at least 24 hours after the last dose. Prothrombin complex concentrate (PCC), activated prothrombin complex concentrate, or recombinant factor VIIa may be considered. If PCCs are administered, tracking apixaban's anticoagulant effect with a clotting test (PT, INR, or aPTT) or anti-factor Xa (FXa) activity provides no benefit and is not recommended. Activated oral charcoal decreases the absorption of apixaban, which in turn reduces apixaban plasma concentration1.
Why it happens (mechanism)
Additive effects on hemostasis
How to manage this interaction
The good news: your care team can manage this combination. There is usually no automatic dose change needed, but your team may watch you more closely and any dosing decisions will be individualized to you.
- Keep taking both exactly as prescribed unless your doctor tells you otherwise.
- Watch for bleeding: unusual bruising, nosebleeds, bleeding gums, pink/red urine, black or bloody stools, coughing or vomiting blood.
- Act fast: report any concerning bleeding to your prescriber right away, or go to an emergency room for heavy or uncontrolled bleeding.
Ask your pharmacist to review all your medicines, including over-the-counter pain relievers like aspirin or ibuprofen, which can add to bleeding risk.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Fluoxetine and Apixaban together?
Fluoxetine and apixaban together can add up to raise your bleeding risk, so keep taking both as prescribed, watch for signs of bleeding, and get help quickly if heavy or unusual bleeding happens. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Fluoxetine and Apixaban interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Fluoxetine and Apixaban interaction managed?
The good news: your care team can manage this combination. There is usually no automatic dose change needed, but your team may watch you more closely and any dosing decisions will be individualized to you. Keep taking both exactly as prescribed unless your doctor tells you otherwise. Watch for bleeding: unusual bruising, nosebleeds, bleeding gums, pink/red urine, black or bloody stools, coughing o… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
- Can You Take Ceylon Cinnamon With Prozac (Fluoxetine)?
- Should You Take Prozac (Fluoxetine) In The Morning Or At Night?
- Benadryl (Diphenhydramine) Interaction With Prozac (Fluoxetine)
- Can You Take Baobab Fiber With Eliquis (Apixaban)?
- Can You Replace an Evening Apixaban Dose With Berberine?
- Can I Take Ginkgo With Apixaban (Eliquis) and Atorvastatin?
Questions for your pharmacist
- Does my dose of Fluoxetine or Apixaban need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (1)
- Product Information: ELIQUIS(R) oral film coated tablets, apixaban oral film coated tablets. Bristol-Myers Squibb Company (per Dailymed), Princeton, NJ, 2024. DailyMed
Keep reading about Fluoxetine
Keep reading about Apixaban
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