Rilpivirine and Abametapir: 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 recordRilpivirine
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, but it doesn't just stay on your scalp. It can briefly slow down a liver enzyme (called CYP3A4) that helps your body break down other medicines. Rilpivirine (Edurant or Juluca) is your HIV medicine, and it's cleared by that same enzyme.
So after using abametapir, rilpivirine could build up in your blood and cause stronger effects or more side effects. This is a caution based on how the drugs work, not on reported cases. The good news: your care team can plan the timing so both are used safely. Please check with your pharmacist or doctor before using abametapir.
Mechanism: Abametapir inhibits CYP3A4. Rilpivirine is a CYP3A4 substrate, so inhibition reduces its metabolism and increases exposure (AUC/Cmax). Neither drug is a prodrug here; this raises rilpivirine levels and potential toxicity (including QT-related concerns at higher exposures).
- Direction: increased rilpivirine exposure
- Onset: rapid
- Evidence: theoretical
- Management: Avoid CYP3A4 substrates for 2 weeks after abametapir application. If unavoidable, avoid abametapir. Coordinate timing with the care team; monitor for enhanced rilpivirine effects if co-exposure occurs.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
Do not administer CYP3A4 substrates during the 2 weeks that follow abametapir application. When avoiding such substrates is not possible, refrain from using abametapir instead 1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
Both medicines can still be used, but timing matters. The documented guidance is:
- Separate them in time: avoid CYP3A4 substrates like rilpivirine for about 2 weeks after applying abametapir lice lotion.
- If you can't wait: the alternative is to avoid using abametapir and choose another lice treatment.
Keep taking your rilpivirine (Edurant/Juluca) as prescribed, and do not start abametapir on your own. Before using any lice product, tell your pharmacist or prescriber you take rilpivirine so they can pick the safest option and timing for you.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Rilpivirine and Abametapir together?
Abametapir can raise rilpivirine levels by slowing its breakdown, so avoid rilpivirine for about 2 weeks after using abametapir, or skip abametapir and use another lice treatment. Ask your pharmacist or doctor before combining them. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Rilpivirine and Abametapir 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 Rilpivirine and Abametapir interaction managed?
Both medicines can still be used, but timing matters. The documented guidance is: Separate them in time: avoid CYP3A4 substrates like rilpivirine for about 2 weeks after applying abametapir lice lotion. If you can't wait: the alternative is to avoid using abametapir and choose another lice treatment. Keep taking your rilpivirine (Edurant/Juluca) as prescribed, and do not start abametapir on your o… 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 Rilpivirine or Abametapir 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 Rilpivirine
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