Apixaban and Ribociclib: 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
Ribociclib
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.
Let's talk about taking Kisqali (ribociclib) together with Eliquis (apixaban), a blood thinner. Ribociclib can slow down a liver enzyme (called CYP3A) that normally helps your body break down apixaban. When that happens, apixaban can build up higher than expected in your blood.
Since apixaban thins your blood, more of it in your system can mean a higher chance of bruising or bleeding. The good news is this is very manageable. Please don't stop or change either medicine on your own. Just let your cancer doctor and pharmacist know you take both so they can watch you closely and adjust things if needed.
Effect: Increased apixaban exposure. Apixaban is a CYP3A4 substrate (and P-gp substrate); ribociclib is a strong CYP3A4 inhibitor. Inhibition of CYP3A-mediated metabolism raises apixaban AUC/Cmax, increasing bleeding risk. Apixaban is an active drug, not a prodrug, so inhibition amplifies its anticoagulant effect.
- Direction: Increased apixaban effect
- Evidence: Theoretical; magnitude not quantified
- Onset: Unspecified
- Management: No specific manufacturer guidance for strong CYP3A inhibitors lacking P-gp inhibition; guidelines suggest avoiding coadministration or using cautiously with close monitoring for signs of bleeding. Dose may be individualized by the care team.
What happens
Increased apixaban exposure
Interaction Deep Dive
Taking apixaban (a CYP3A substrate) together with a potent CYP3A inhibitor can lead to a substantial rise in apixaban concentrations2. Although the manufacturer offers no specific recommendations regarding the combined use of apixaban with strong CYP3A inhibitors that lack P-gp inhibitory activity1, clinical guidelines recommend avoiding this combination or, alternatively, using it with caution alongside close monitoring2.
Why it happens (mechanism)
Inhibition of CYP3A-mediated metabolism of apixaban
How to manage this interaction
This interaction is usually manageable with a little extra attention from your care team.
- Keep taking both exactly as prescribed unless your doctor tells you otherwise.
- Your team may choose to avoid the combination, adjust and individualize your apixaban dose, or monitor you more closely while you are on both.
- Watch for and report signs of bleeding: unusual bruising, nosebleeds, pink or red urine, black stools, or bleeding that won't stop.
- Tell every provider and your pharmacist that you take both medicines, and ask before starting any new drug or supplement.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Apixaban and Ribociclib together?
Ribociclib can raise apixaban levels and increase bleeding risk, so tell your care team you take both; they can monitor you closely or adjust your plan. Watch for any unusual bleeding or bruising. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Apixaban and Ribociclib 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 Ribociclib interaction managed?
This interaction is usually manageable with a little extra attention from your care team. Keep taking both exactly as prescribed unless your doctor tells you otherwise. Your team may choose to avoid the combination, adjust and individualize your apixaban dose, or monitor you more closely while you are on both. Watch for and report signs of bleeding: unusual bruising, nosebleeds, pink or red urine,… 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 Apixaban or Ribociclib 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 (2)
- Product Information: ELIQUIS(R) oral film coated tablets, apixaban oral film coated tablets. Bristol-Myers Squibb Company (per Dailymed), Princeton, NJ, 2024. DailyMed
- Steffel J, Collins R, Antz M, et al: 2021 European Heart Rhythm Association Practical Guide on the use of non-vitamin K antagonist oral anticoagulants in patients with atrial fibrillation. Europace 2021; 23(10):1612-1676.
Keep reading about Ribociclib
Keep reading about Apixaban
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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