Abametapir and Pomalidomide: 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 recordPomalidomide
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 gets into your body and can briefly slow down a liver enzyme called CYP1A2. That enzyme helps clear out pomalidomide (Pomalyst), your cancer medicine. If that enzyme is slowed, more pomalidomide can build up in your body, which could mean stronger side effects like low blood counts, tiredness, or a higher infection risk.
This is based on how the drug is expected to behave, not on reported cases, but because pomalidomide is a serious medicine, it is worth taking seriously. The good news: your care team can plan around this easily, so please tell your pharmacist or doctor before using any lice treatment.
Mechanism: Abametapir inhibits CYP1A2. Pomalidomide is partly metabolized by CYP1A2 (and CYP3A4), so co-exposure is predicted to increase pomalidomide AUC/Cmax.
- Direction: increased pomalidomide exposure, greater risk of dose-related toxicity (myelosuppression, neutropenia, fatigue, VTE, infection).
- Evidence: theoretical, based on abametapir's known CYP1A2 inhibition; no clinical outcome data.
- Onset: unspecified; enzyme inhibition can persist for up to 2 weeks post-application.
- Management: Avoid CYP1A2 substrates for 2 weeks after abametapir application. If unavoidable, avoid abametapir and select an alternative lice treatment. Neither drug is a prodrug, so inhibition raises, not lowers, effect.
What happens
Increased exposure of CYP1A2 substrates
Interaction Deep Dive
Within a 2 week window following the application of abametapir, the use of CYP1A2 substrates should be avoided. Should that not be practical, abametapir itself should not be used 1.
Why it happens (mechanism)
Inhibition of CYP1A2-mediated metabolism by abametapir
How to manage this interaction
Keep taking your pomalidomide as prescribed. The concern here is only about adding abametapir lice lotion on top of it.
- Do not start any lice treatment without checking with your pharmacist or oncology team first.
- The documented guidance is to avoid CYP1A2 substrates like pomalidomide for 2 weeks after applying abametapir. If that timing is not feasible, the safer choice is to avoid abametapir and use a different lice treatment instead.
- Your team can help pick an alternative and, if needed, monitor you more closely.
Tell your pharmacist about all your medicines so they can time things safely.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abametapir and Pomalidomide together?
Abametapir can slow the breakdown of pomalidomide and let it build up, raising the risk of side effects, so avoid combining them and ask your care team to recommend a different lice treatment. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abametapir and Pomalidomide 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 Abametapir and Pomalidomide interaction managed?
Keep taking your pomalidomide as prescribed. The concern here is only about adding abametapir lice lotion on top of it. Do not start any lice treatment without checking with your pharmacist or oncology team first. The documented guidance is to avoid CYP1A2 substrates like pomalidomide for 2 weeks after applying abametapir. If that timing is not feasible, the safer choice is to avoid abametapir and… 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 Pomalidomide 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
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