Abrocitinib and Carbamazepine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 10, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Carbamazepine
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.
Here's what's going on. Carbamazepine (Tegretol) is a strong "enzyme booster." It speeds up one of your liver's cleanup pathways, and abrocitinib (Cibinqo), your eczema medicine, is partly cleared by that same pathway. When the two are taken together, your body may break down and remove the abrocitinib faster than usual.
The concern is that abrocitinib could end up weaker, so your skin symptoms might not be controlled as well. This is based on how the drugs behave rather than lots of patient studies, so nobody is saying disaster. Keep taking both exactly as prescribed, and let your pharmacist or doctor know you're on both so they can keep an eye on how well your treatment is working.
Mechanism: Carbamazepine is a potent inducer of CYP2C9 (and broadly CYP3A4/2C19). Abrocitinib is a CYP2C9/2C19/3A4 substrate, so induction is expected to increase abrocitinib clearance and lower its plasma exposure (AUC/Cmax).
Direction: Reduced abrocitinib exposure and potential loss of efficacy for atopic dermatitis. Neither agent's active moiety depends on CYP2C9 activation, so the effect is a straightforward efficacy reduction.
- Onset: unspecified; induction typically develops over days to weeks.
- Evidence: theoretical.
- Management: monitor clinical response; abrocitinib dose may need to be individualized, or consider an alternative anti-inflammatory not subject to potent CYP induction.
What happens
Reduced CYP2C9 substrate exposure and reduced efficacy of CYP2C9 substrate
Interaction Deep Dive
Taking carBAMazepine together with a CYP2C9 substrate may lower the exposure to the CYP2C9 substrate. When the two are used together, monitor levels of the CYP2C9 substrate carefully and think about adjusting the dose when warranted12.
Why it happens (mechanism)
Induction of CYP2C9-mediated metabolism by carBAMazepine
How to manage this interaction
The good news: your care team can manage this by tailoring your treatment and watching how you respond.
- Keep taking both exactly as prescribed unless your prescriber tells you otherwise.
- Your team may monitor how well your eczema is controlled, since abrocitinib could be less effective while you're on carbamazepine.
- Your abrocitinib dose may need to be adjusted and individualized, or your prescriber may consider an alternative.
- Tell your pharmacist and doctor you take both, and report any flare or worsening skin symptoms so they can respond.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abrocitinib and Carbamazepine together?
Carbamazepine can speed up the breakdown of abrocitinib and make your eczema medicine work less well, so keep taking both as prescribed and let your care team watch your response and adjust if needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abrocitinib and Carbamazepine 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 Abrocitinib and Carbamazepine interaction managed?
The good news: your care team can manage this by tailoring your treatment and watching how you respond. Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Your team may monitor how well your eczema is controlled, since abrocitinib could be less effective while you're on carbamazepine. Your abrocitinib dose may need to be adjusted and individualized, or your prescrib… 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 Abrocitinib or Carbamazepine 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: Tegretol(R)-XR oral extended-release tablets, carbamazepine oral extended-release tablets. Novartis Pharmaceuticals Corporation (per FDA), East Hanover, NJ, 2023. DailyMed
- Product Information: Tegretol(R) oral chewable tablets, oral tablets, oral suspension, carbamazepine oral chewable tablets, oral tablets, oral suspension. Novartis Pharmaceuticals Corporation (per FDA), East Hanover, NJ, 2023. DailyMed
Keep reading about Carbamazepine
Keep reading about Abrocitinib
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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