Reviparin 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
Reviparin
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.
Both of these medicines are blood thinners. Apixaban (Eliquis) blocks a clotting factor called factor Xa, and reviparin is a heparin-type blood thinner. Taking them together means you have two drugs slowing your clotting at the same time, so your risk of bleeding goes up. That bleeding can be serious.
Signs to watch for include unusual bruising, pink or red urine, black or bloody stools, nosebleeds that will not stop, or coughing/vomiting blood. If you notice any of these, get medical help right away. The good news: your care team knows how to handle this by adjusting doses, monitoring you closely, and there is even a reversal agent if needed. Please don't stop either medicine on your own.
Mechanism: Additive anticoagulation. Apixaban is a direct factor Xa inhibitor; reviparin is a low molecular weight heparin with anti-Xa activity. Neither is a prodrug, so effects are simply additive, increasing bleeding risk.
- Direction/magnitude: Increased anti-Xa activity and bleeding risk. Analogous apixaban plus enoxaparin data showed a 50 to 60% rise in anti-factor Xa activity.
- Evidence: Probable. Severity: Major.
- Management: Avoid concurrent use unless clearly indicated (e.g., brief transition). Discontinue apixaban if active pathological bleeding occurs; effect persists at least 24h post-dose. A specific reversal agent is available; PCC/aPCC/rFVIIa may be considered. Counsel on bleeding signs.
What happens
An increased risk of bleeding and can cause serious, potentially fatal bleeding
Interaction Deep Dive
Giving apixaban, a factor Xa inhibitor, together with another anticoagulant raises the likelihood of bleeding. Pharmacodynamic drug interaction studies of apixaban demonstrated that combining apixaban with enoxaparin produced a 50% to 60% rise in anti-factor Xa activity. If active pathological bleeding develops, apixaban should be stopped. There is an agent available that reverses the anti-factor Xa activity of apixaban. Apixaban's pharmacodynamic effect is expected to last for a minimum of 24 hours following the last dose. Patients should be counseled about the signs and symptoms of blood loss and instructed to report them without delay or present to an emergency room. Prothrombin complex concentrate (PCC), activated prothrombin complex concentrate, or recombinant factor VIIa may be considered. In cases where PCCs are administered, using a clotting test (PT, INR, or aPTT) or anti-factor Xa (FXa) activity to monitor apixaban's anticoagulation effect provides no benefit and is not recommended. The absorption of apixaban is diminished by activated oral charcoal, which consequently reduces apixaban exposure1.
Why it happens (mechanism)
Additive anticoagulation
How to manage this interaction
Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Using two blood thinners together is sometimes done deliberately for a short time, but it needs oversight.
- Your care team may adjust and individualize dosing and monitor you more closely.
- Learn the warning signs of bleeding: unusual bruising, red or black stools, pink/red urine, prolonged nosebleeds, coughing or vomiting blood, severe headache, or dizziness.
- Report these signs right away or go to an emergency room. A reversal agent for apixaban is available if serious bleeding occurs.
- Ask your pharmacist or doctor before starting any new medicine, including over-the-counter pain relievers like ibuprofen or aspirin.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In investigations examining pharmacodynamic drug interactions involving apixaban, a 50% to 60% rise in anti-factor Xa activity was noted when apixaban was given together with enoxaparin 1.
Common questions
Can I take Reviparin and Apixaban together?
Combining apixaban with reviparin adds two blood thinners together and meaningfully raises bleeding risk, so this should only be done under close supervision by your care team. Watch for any signs of bleeding and get help immediately if they appear. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Reviparin 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 Reviparin and Apixaban interaction managed?
Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Using two blood thinners together is sometimes done deliberately for a short time, but it needs oversight. Your care team may adjust and individualize dosing and monitor you more closely. Learn the warning signs of bleeding: unusual bruising, red or black stools, pink/red urine, prolonged nosebleeds, coughing or vom… 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 Reviparin 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 Apixaban
Keep reading about Reviparin
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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