Defibrotide 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
Apixaban
Defibrotide
No brand names on record
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.
Apixaban (Eliquis) is a blood thinner, and defibrotide also affects how your blood clots and bleeds. When they are used together, their effects can stack up, which means a much higher chance of serious bleeding. Because of this, these two are not meant to be taken at the same time.
The good news is that your care team knows how to handle this safely. Usually a blood thinner is stopped and given time to wear off before defibrotide is started. Please do not stop or change either medicine on your own. Talk with your doctor or pharmacist, and they will map out the safest plan for you.
Combination is contraindicated. Defibrotide has profibrinolytic and antithrombotic properties; co-administration with a systemic anticoagulant such as apixaban (a direct oral factor Xa inhibitor) produces additive pharmacodynamic effects and markedly increased bleeding risk.
- Mechanism: enhanced PD antithrombotic activity (additive), not a PK/enzyme interaction. Neither agent is a prodrug requiring activation.
- Evidence: theoretical, but severity rated contraindicated.
- Management: Discontinue systemic antithrombotics before initiating defibrotide; consider delaying defibrotide until apixaban effects subside. Exception: routine use for maintenance/reopening of central venous lines.
What happens
Increased risk of bleeding
Interaction Deep Dive
Because defibrotide can potentiate the pharmacodynamic effect of a systemic antithrombotic drug like this one, raising the likelihood of bleeding, giving the two together is contraindicated. Routine use aimed at maintaining or reopening central venous lines is excluded from this restriction. Stop antithrombotic agents before starting defibrotide, and consider postponing the start of defibrotide until this drug's effects have worn off1.
Why it happens (mechanism)
Enhanced pharmacodynamic activity of antithrombotic agent
How to manage this interaction
These two are generally not used together. The standard approach is to stop the systemic blood thinner (apixaban) before starting defibrotide, and to consider delaying defibrotide until apixaban has cleared from your system. This warning does not apply to routine flushing or reopening of central venous lines.
- Keep taking your medicines exactly as prescribed and do not stop anything on your own.
- Make sure every provider knows you take apixaban before defibrotide is considered.
- Ask your pharmacist or prescriber to confirm the timing plan and how you will be monitored for bleeding.
Your care team can coordinate the timing so this is managed safely.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Defibrotide and Apixaban together?
Apixaban and defibrotide together sharply raise bleeding risk and are considered contraindicated; the blood thinner is typically stopped and allowed to wear off before defibrotide is started, so let your care team coordinate the timing. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Defibrotide and Apixaban interaction?
It is rated contraindicated. These should generally not be used together.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Defibrotide and Apixaban interaction managed?
These two are generally not used together. The standard approach is to stop the systemic blood thinner (apixaban) before starting defibrotide, and to consider delaying defibrotide until apixaban has cleared from your system. This warning does not apply to routine flushing or reopening of central venous lines. Keep taking your medicines exactly as prescribed and do not stop anything on your own. Ma… 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:
Questions for your pharmacist
- Does my dose of Defibrotide 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: DEFITELIO(R) intravenous injection, defibrotide sodium intravenous injection. Jazz Pharmaceuticals (per FDA), Palo Alto, CA, 2016. DailyMed
Keep reading about Apixaban
Keep reading about Defibrotide
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