Apixaban and Bivalirudin: 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
Bivalirudin
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.
Both of these medicines are blood thinners. Apixaban (Eliquis) blocks a clotting protein called factor Xa, and bivalirudin (Angiomax) is a strong injectable blood thinner usually given in a hospital. When you take them together, their effects add up, so your blood clots even less easily. That means a higher chance of bleeding, and in some cases that bleeding can be serious.
The good news is that this is well understood, and your care team plans for it. If you notice things like unusual bruising, blood in your urine or stool, black stools, coughing up blood, or bleeding that won't stop, tell your team right away or go to the emergency room. They can adjust your treatment and watch you closely.
Additive anticoagulation. Apixaban is a direct factor Xa inhibitor; bivalirudin is a direct thrombin inhibitor. Neither is a prodrug, so the effect is straightforward pharmacodynamic additivity, not a metabolic interaction, increasing bleeding risk.
- Direction: increased anticoagulant effect and bleeding risk.
- Magnitude: PD studies with apixaban plus enoxaparin showed a 50 to 60% rise in anti-Xa activity; a comparable additive effect is expected here.
- Evidence/onset: probable; onset unspecified. Apixaban PD effect persists at least 24 hours after the last dose.
- Management: avoid overlap unless clinically required; monitor for bleeding. Discontinue apixaban with active pathological bleeding. Andexanet alfa reverses anti-Xa activity; PCC, aPCC, or rFVIIa may be considered (with PCC, PT/INR/aPTT and anti-Xa monitoring are not useful).
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 another anticoagulant raises the likelihood of bleeding. Pharmacodynamic interaction studies involving apixaban demonstrated that giving apixaban alongside enoxaparin produced a 50% to 60% rise in anti-factor Xa activity. Should active pathological bleeding develop, apixaban should be stopped. A reversal agent for the anti-factor Xa activity of apixaban is available. Apixaban's pharmacodynamic effect can be anticipated to last for a minimum of 24 hours following the final dose. Patients should be counseled about the signs and symptoms of blood loss and instructed to report them without delay or to go to an emergency room. Prothrombin complex concentrate (PCC), activated prothrombin complex concentrate, or recombinant factor VIIa may be considered. If PCCs are administered, tracking apixaban's anticoagulation effect via a clotting test (PT, INR, or aPTT) or anti-factor Xa (FXa) activity offers no benefit and is not recommended. Activated oral charcoal decreases apixaban absorption, which in turn diminishes apixaban exposure1.
Why it happens (mechanism)
Additive anticoagulation
How to manage this interaction
Keep taking everything exactly as prescribed and do not stop either drug on your own. Using two blood thinners together is sometimes done on purpose in a hospital setting, and your care team manages the added bleeding risk closely.
- Your team may watch you more closely and individualize your treatment.
- A reversal agent is available if serious bleeding occurs, and apixaban would be stopped if active bleeding happens.
- Learn the signs of bleeding: unusual bruising, pink or red urine, black or bloody stools, coughing or vomiting blood, severe headache, or bleeding that won't stop.
Report any of these immediately or go to the emergency room. Ask your pharmacist or prescriber any questions about combining these medicines.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In investigations of pharmacodynamic drug interactions involving apixaban, an increase of 50% to 60% in anti-factor Xa activity was noted when apixaban and enoxaparin were given together 1.
Common questions
Can I take Apixaban and Bivalirudin together?
Apixaban and bivalirudin are both blood thinners, so together they raise your bleeding risk. Keep taking both as prescribed, watch for signs of bleeding, and get emergency help if serious bleeding occurs. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Apixaban and Bivalirudin 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 Apixaban and Bivalirudin interaction managed?
Keep taking everything exactly as prescribed and do not stop either drug on your own. Using two blood thinners together is sometimes done on purpose in a hospital setting, and your care team manages the added bleeding risk closely. Your team may watch you more closely and individualize your treatment. A reversal agent is available if serious bleeding occurs, and apixaban would be stopped if active… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Apixaban or Bivalirudin 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 Apixaban
Keep reading about Bivalirudin
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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