Abametapir and Ribociclib: 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 recordRibociclib
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 can get into your body and briefly slow down a liver enzyme (called CYP3A4) that helps break down other medicines. Ribociclib (Kisqali) is a cancer medicine that this same enzyme clears from your body.
If you use them close together, ribociclib could build up higher than intended, which may raise the chance of side effects. The good news is this is easy to plan around. Talk with your pharmacist or doctor before using the lice lotion so they can time things safely.
Effect: Abametapir inhibits CYP3A4, reducing metabolism of ribociclib (a CYP3A4 substrate), leading to increased ribociclib exposure (AUC/Cmax) and higher toxicity risk.
- Direction: Increased ribociclib effect/exposure (neither drug is a prodrug here).
- Onset: Rapid; inhibition can persist for up to ~2 weeks after a single topical application.
- Evidence: Theoretical, but rated major.
- Management: Avoid CYP3A4 substrates such as ribociclib within 2 weeks of abametapir application; if unavoidable, avoid abametapir. Monitor for ribociclib toxicity (QTc prolongation, hepatotoxicity, neutropenia) if co-exposure occurs.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
For a period of 2 weeks following the application of abametapir, refrain from using CYP3A4 substrates. When avoiding such substrates is not practical, then abametapir itself should not be used 1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
This is manageable with good timing and communication with your care team.
- Keep taking your ribociclib (Kisqali) as prescribed and do not stop your cancer treatment on your own.
- Before using abametapir lice lotion, tell your pharmacist or oncologist. The general guidance is to avoid CYP3A4 medicines like ribociclib within 2 weeks after applying abametapir, and if that spacing is not possible, to avoid the lice lotion instead.
- Ask your team about alternatives for lice treatment that do not affect this enzyme.
- Watch for and report new or worsening ribociclib side effects if you have used both close together.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abametapir and Ribociclib together?
Do not use abametapir lice lotion within 2 weeks of taking ribociclib, since it can raise ribociclib levels and side-effect risk. Check with your pharmacist or oncologist to time or replace the lice treatment safely. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abametapir and Ribociclib 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 Ribociclib interaction managed?
This is manageable with good timing and communication with your care team. Keep taking your ribociclib (Kisqali) as prescribed and do not stop your cancer treatment on your own. Before using abametapir lice lotion, tell your pharmacist or oncologist. The general guidance is to avoid CYP3A4 medicines like ribociclib within 2 weeks after applying abametapir, and if that spacing is not possible, to a… 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 Ribociclib 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 Ribociclib
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