Abametapir and Boceprevir: 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 recordBoceprevir
No brand names on record
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. 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 slow down a liver enzyme called CYP3A4 for up to two weeks. That enzyme is one of the main ways your body breaks down boceprevir, a medicine used for hepatitis C.
So while that enzyme is slowed, boceprevir may build up higher than usual, which could mean more side effects. The good news is your care team can manage this easily by planning the timing of these two treatments. Please check with your pharmacist or doctor before using both.
Mechanism: Abametapir inhibits CYP3A4. Boceprevir is a CYP3A4 substrate (and itself a CYP3A4 inhibitor), so co-exposure is expected to increase boceprevir plasma concentrations and AUC.
- Direction: increased boceprevir exposure, greater risk of concentration-dependent adverse effects.
- Onset: rapid; inhibition can persist up to 2 weeks after topical abametapir.
- Evidence: theoretical.
- Management: Avoid CYP3A4 substrates within 2 weeks of abametapir application. If unavoidable, avoid abametapir. Where co-use occurs, consider closer clinical monitoring.
Neither is a prodrug requiring activation here, so effect is amplified rather than reduced.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
Refrain from administering CYP3A4 substrates during the 2 week period following abametapir application. Should this not be practical, abametapir itself should be avoided 1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
What your care team may do:
- Separate these treatments in time. Guidance is to avoid CYP3A4 substrates like boceprevir for about two weeks after applying abametapir.
- If that timing isn't possible, the preferred choice is usually to avoid the abametapir lice treatment and use another option.
- If both must be used, your team may monitor you more closely for boceprevir side effects.
What you should do: Keep taking your prescribed medicines as directed, and don't start the lice lotion without checking first. Tell your pharmacist or prescriber you use both so they can plan the safest timing.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abametapir and Boceprevir together?
Abametapir can raise boceprevir levels for up to two weeks by blocking its breakdown, so avoid using them close together and talk to your pharmacist or doctor about timing. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abametapir and Boceprevir 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 Boceprevir interaction managed?
What your care team may do: Separate these treatments in time. Guidance is to avoid CYP3A4 substrates like boceprevir for about two weeks after applying abametapir. If that timing isn't possible, the preferred choice is usually to avoid the abametapir lice treatment and use another option. If both must be used, your team may monitor you more closely for boceprevir side effects. What you should do:… 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 Boceprevir 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 Boceprevir
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