Idelalisib 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
Idelalisib
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.
These two medicines can affect each other. Apixaban (Eliquis) is a blood thinner that helps prevent clots. Idelalisib (Zydelig) blocks a liver enzyme called CYP3A that normally helps break down apixaban. When that breakdown slows, more apixaban can build up in your body.
More apixaban means a stronger blood-thinning effect, which can raise the chance of bruising or bleeding. This is based mostly on how the drugs work rather than large studies, but it is worth taking seriously. Please don't stop or change either medicine on your own. Your care team can manage this by adjusting your dose if needed and watching you more closely.
Effect: Increased apixaban exposure. Apixaban is an active anticoagulant (not a prodrug); idelalisib is a strong CYP3A4 inhibitor, so inhibition of CYP3A-mediated metabolism raises apixaban AUC/Cmax and bleeding risk.
- Direction: Enhanced apixaban effect (increased exposure).
- Magnitude: Potentially significant; not precisely quantified.
- Onset: Unspecified.
- Evidence: Theoretical/mechanistic. Manufacturer gives no specific guidance for strong CYP3A inhibitors lacking P-gp inhibition.
- Management: Guidelines suggest avoiding concomitant use or using cautiously with close monitoring for signs of bleeding; individualize dosing per care team.
What happens
Increased apixaban exposure
Interaction Deep Dive
Taking apixaban (a CYP3A substrate) together with a potent CYP3A inhibitor can markedly raise apixaban concentrations2. Although the manufacturer offers no specific recommendations for combining apixaban with strong CYP3A inhibitors that lack P-gp inhibitory activity1, clinical guidelines recommend either avoiding the combination or using it with caution alongside close monitoring2.
Why it happens (mechanism)
Inhibition of CYP3A-mediated metabolism of apixaban
How to manage this interaction
The good news: your care team can manage this. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Clinical guidelines suggest either avoiding this combination or using it carefully with close monitoring, so your team may decide which path fits you.
- Your apixaban dose may need to be adjusted and individualized by your care team.
- Watch for and promptly report signs of bleeding, such as unusual bruising, nosebleeds, pink or red urine, black stools, or bleeding that won't stop.
- Ask your pharmacist or doctor before starting or stopping either drug or any new medicine.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Idelalisib and Apixaban together?
Idelalisib can raise apixaban levels and increase bleeding risk, so your care team may avoid the combination or watch you closely and adjust the dose. Keep taking both as prescribed and report any unusual bleeding. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Idelalisib 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 Idelalisib and Apixaban interaction managed?
The good news: your care team can manage this. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Clinical guidelines suggest either avoiding this combination or using it carefully with close monitoring, so your team may decide which path fits you. Your apixaban dose may need to be adjusted and individualized by your care team. Watch for and promptly repor… 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 Idelalisib 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 (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 Idelalisib
Keep reading about Apixaban
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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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