Abatacept and Fedratinib: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 16, 2026 · Source data updated Jul 16, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Fedratinib
Abatacept
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.
Fedratinib (Inrebic) and abatacept (Orencia) both calm down parts of your immune system, just in different ways. Fedratinib blocks a signal called JAK, and abatacept dials back certain immune cells. When you take them together, your immune defenses can be lowered more than with either drug alone, which may make it easier to catch an infection.
Because of this, using both at the same time is generally not recommended. Please don't stop or change either medicine on your own. Instead, talk with your doctor or pharmacist. They can look at your full picture and help you use the safest option for you.
Interaction: Additive immunosuppression when the JAK inhibitor fedratinib is combined with the T-cell costimulation modulator abatacept, giving an increased risk of infection.
- Direction: Pharmacodynamic (not PK); both agents suppress immune function, compounding the effect.
- Mechanism: Unknown/not fully characterized; presumed additive immunosuppression.
- Evidence: Theoretical. Insufficient safety/efficacy data for concurrent use.
- Severity: Major. Onset unspecified.
- Management: Concurrent therapy is not recommended. If exposure occurs, monitor closely for signs of infection and reassess the regimen.
What happens
An increased risk of infection
Interaction Deep Dive
Data are lacking to assess how safe and effective abatacept is when given together with janus kinase inhibitors. As a result, using these agents concurrently is not advised1.
Why it happens (mechanism)
Unknown
How to manage this interaction
What your care team may do:
- Generally avoid using fedratinib and abatacept together, since combining them is not recommended.
- Consider whether one drug can be replaced or spaced apart, based on your condition.
- Watch you more closely for signs of infection if both are ever used.
What you can do:
- Keep taking both exactly as prescribed until you speak with your prescriber or pharmacist.
- Tell your care team you are on both drugs and ask if this combination is right for you.
- Report fever, chills, sore throat, cough, or any signs of infection promptly.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abatacept and Fedratinib together?
Fedratinib and abatacept both suppress the immune system, so using them together may raise your infection risk and is generally not recommended. Don't change anything on your own; check with your doctor or pharmacist. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abatacept and Fedratinib 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 Abatacept and Fedratinib interaction managed?
What your care team may do: Generally avoid using fedratinib and abatacept together, since combining them is not recommended. Consider whether one drug can be replaced or spaced apart, based on your condition. Watch you more closely for signs of infection if both are ever used. What you can do: Keep taking both exactly as prescribed until you speak with your prescriber or pharmacist. Tell your car… 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.
Questions for your pharmacist
- Does my dose of Abatacept or Fedratinib 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: ORENCIA(R) intravenous, subcutaneous injection, abatacept intravenous, subcutaneous injection. Bristol-Myers Squibb Company (per FDA), Princeton, NJ, 2020. DailyMed
Keep reading about Fedratinib
Keep reading about Abatacept
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