Abametapir and Imatinib: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jun 30, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Abametapir
No brand names on recordImatinib
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.
Abametapir is a lotion used to treat head lice. Even though you only put it on your scalp, a little bit can get into your body and briefly slow down a liver enzyme called CYP3A4. That enzyme is one of the main ways your body breaks down imatinib (Gleevec).
If that enzyme is slowed, imatinib can build up higher than expected, which may lead to more side effects like nausea, swelling, muscle cramps, or low blood counts. This effect is expected based on how the drugs work rather than proven in studies, but it is worth taking seriously. The good news: your care team can plan the timing so the two do not overlap.
Mechanism: Abametapir inhibits CYP3A4. Imatinib is a CYP3A4 substrate (not a prodrug), so inhibition reduces its metabolism and increases systemic exposure (AUC/Cmax).
- Direction: Increased imatinib exposure, raising risk of dose-related toxicity (myelosuppression, edema, GI effects, hepatotoxicity).
- Onset: Rapid; enzyme inhibition can persist for up to ~2 weeks after a single topical application.
- Evidence: Theoretical, based on abametapir's known CYP3A4 inhibition.
- Management: Avoid CYP3A4 substrates such as imatinib within 2 weeks of abametapir application; if unavoidable, avoid using abametapir.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
During the 2 weeks following abametapir application, refrain from administering CYP3A4 substrates. Should avoiding these substrates not be possible, then abametapir itself should be avoided1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
Keep taking your imatinib as prescribed. The concern is short-term: abametapir can affect how you clear imatinib for up to about two weeks after it is applied.
- The general guidance is to avoid using a CYP3A4 substrate like imatinib within 2 weeks after applying abametapir. If that is not feasible, the abametapir should be avoided instead.
- Talk to your pharmacist or prescriber before using any lice treatment while on imatinib so timing can be planned.
- Ask what side effects to watch for; your team may monitor you more closely if both are needed.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abametapir and Imatinib together?
Abametapir can briefly raise imatinib levels and increase side effects, so avoid using imatinib within two weeks of applying abametapir. Check with your pharmacist or doctor before using any lice treatment. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abametapir and Imatinib interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
How is the Abametapir and Imatinib interaction managed?
Keep taking your imatinib as prescribed. The concern is short-term: abametapir can affect how you clear imatinib for up to about two weeks after it is applied. The general guidance is to avoid using a CYP3A4 substrate like imatinib within 2 weeks after applying abametapir. If that is not feasible, the abametapir should be avoided instead. Talk to your pharmacist or prescriber before using any lice… 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 Abametapir or Imatinib 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: XEGLYZE(TM) topical lotion, abametapir topical lotion. Dr Reddy’s Laboratories Inc (per FDA), Princeton, NJ, 2020. DailyMed
Keep reading about Abametapir
Keep reading about Imatinib
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