Abrocitinib and Pimozide: 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
Pimozide
No brand names on recordAbrocitinib
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.
You've been prescribed pimozide (an antipsychotic) along with abrocitinib (Cibinqo, for eczema). Here's the concern: abrocitinib can slow down one of the liver enzymes (called CYP1A2) that normally clears pimozide from your body. When that enzyme is blocked, pimozide can build up to higher levels than intended.
Higher pimozide levels can mean more side effects, and one thing we watch carefully is the heart's rhythm. The good news is this is based mostly on theory, not lots of real-world reports. Your care team can manage it by adjusting doses and keeping a closer eye on you. Please don't stop either medicine on your own, just check in with your doctor or pharmacist.
Effect: Abrocitinib inhibits CYP1A2, the primary enzyme metabolizing pimozide (a CYP1A2 substrate), potentially increasing pimozide exposure (AUC/Cmax) and the risk of pimozide-related adverse reactions.
- Direction: Increased pimozide effect/toxicity.
- Key concern: Pimozide is QT-prolonging and dose-dependent torsades risk; treat with caution.
- Onset: Unspecified.
- Evidence: Theoretical.
- Management: Pimozide dose may need to be individualized and reduced by the care team; consider ECG/QTc and electrolyte monitoring, and watch for extrapyramidal or sedative effects. Evaluate whether the combination is necessary.
What happens
Increased pimozide exposure and an increased risk of pimozide-related adverse reactions
Interaction Deep Dive
Because pimozide is a substrate of CYP1A2, giving it together with CYP1A2 inhibitors can raise pimozide levels, thereby heightening the potential for adverse reactions associated with pimozide1.
Why it happens (mechanism)
Inhibition of CYP1A2-mediated metabolism of pimozide
How to manage this interaction
Keep taking both medicines as prescribed unless your care team tells you otherwise. Because abrocitinib can raise pimozide levels, your team has options to keep you safe.
- Your pimozide dose may need to be adjusted and individualized by your prescriber.
- Your team may monitor you more closely, including watching for new side effects.
- In some cases, they may consider whether an alternative is a better fit.
Tell your pharmacist or doctor if you notice unusual drowsiness, muscle stiffness, tremor, restlessness, or any dizziness, fainting, or heart-rhythm changes.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abrocitinib and Pimozide together?
Abrocitinib may raise pimozide levels by slowing its breakdown, so your care team may lower the pimozide dose and monitor you more closely. Keep taking both as prescribed and report any new side effects. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abrocitinib and Pimozide 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 Pimozide interaction managed?
Keep taking both medicines as prescribed unless your care team tells you otherwise. Because abrocitinib can raise pimozide levels, your team has options to keep you safe. Your pimozide dose may need to be adjusted and individualized by your prescriber. Your team may monitor you more closely, including watching for new side effects. In some cases, they may consider whether an alternative is a bette… 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 Abrocitinib or Pimozide 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: Pimozide oral tablet, pimozide oral tablet. Endo USA, Inc (per DailyMed), Malvern, PA, 2017. DailyMed
Keep reading about Pimozide
Keep reading about Abrocitinib
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