Aspirin and Abrocitinib: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 11, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Aspirin
Abrocitinib
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 can make it harder for your blood to clot. Aspirin keeps your platelets (the cells that help form clots) from sticking together, and abrocitinib (Cibinqo) can also affect platelets and raise bleeding risk. Taken together, that risk adds up.
Because of this, full-dose aspirin and abrocitinib are generally not combined, especially during the first 3 months of abrocitinib treatment. A low daily aspirin dose (81 mg or less) is treated differently and may be allowed. Don't change anything on your own. Your doctor or pharmacist can look at your exact doses and sort out the safest plan for you.
Effect: Additive impairment of hemostasis, increasing bleeding risk (pharmacodynamic interaction, not metabolic). Aspirin is an irreversible platelet COX-1 inhibitor; abrocitinib (a JAK1 inhibitor) carries a labeled bleeding/thrombocytopenia signal.
- Direction: Increased bleeding risk (additive antiplatelet/hemostatic effect).
- Severity: Contraindicated with antiplatelet agents during the first 3 months of abrocitinib therapy, except low-dose aspirin (81 mg/day or less).
- Onset: Unspecified.
- Evidence: Theoretical.
Management: Avoid full-dose/therapeutic aspirin during initial 3 months. Low-dose aspirin (81 mg daily or less) is permitted. Monitor for bleeding signs and platelet counts.
What happens
Increased risk of bleeding
Interaction Deep Dive
Using abrocitinib together with antiplatelet drugs is contraindicated throughout the initial 3 months of therapy because it raises the likelihood of bleeding, with the exception of low-dose aspirin (81 mg per day or lower)1.
Why it happens (mechanism)
Additive effects on hemostasis
How to manage this interaction
The concern is that combining these can add up to a higher bleeding risk, so care teams handle the aspirin dose carefully.
- Full-dose aspirin is generally avoided with abrocitinib during the first 3 months of treatment.
- Low-dose aspirin (81 mg daily or less) is usually considered acceptable.
- Your team may watch you more closely for bleeding and check bloodwork such as platelet counts.
Keep taking both exactly as prescribed and don't stop or change a dose on your own. Tell your pharmacist or prescriber exactly what strength of aspirin you take, and report any unusual bruising, bleeding gums, nosebleeds, or blood in stool or urine.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Aspirin and Abrocitinib together?
Full-dose aspirin plus abrocitinib raises bleeding risk and is avoided during the first 3 months of treatment, though low-dose aspirin (81 mg or less daily) is generally okay. Confirm your exact aspirin dose with your pharmacist or doctor before combining. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Aspirin and Abrocitinib 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 Aspirin and Abrocitinib interaction managed?
The concern is that combining these can add up to a higher bleeding risk, so care teams handle the aspirin dose carefully. Full-dose aspirin is generally avoided with abrocitinib during the first 3 months of treatment. Low-dose aspirin (81 mg daily or less) is usually considered acceptable. Your team may watch you more closely for bleeding and check bloodwork such as platelet counts. Keep taking b… 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 Aspirin or Abrocitinib 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: CIBINQO(TM) oral tablets, abrocitinib oral tablets. Pfizer Labs (per FDA), New York, NY, 2022. DailyMed
Keep reading about Aspirin
Keep reading about Abrocitinib
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