Rivaroxaban 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 recordRivaroxaban
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 put it on your scalp, a little can get into your body and briefly block a liver enzyme (called CYP3A4) that helps break down other medicines.
Rivaroxaban (Xarelto) is a blood thinner that this same enzyme clears. If the enzyme is blocked, more rivaroxaban can build up in your body, which could raise your risk of bleeding. This concern is based on how the drugs work rather than on direct studies, but it is taken seriously. The good news: your care team can plan the timing and watch you closely, so bring this up with your pharmacist or doctor before using both.
Mechanism: Abametapir inhibits CYP3A4, reducing metabolism of the CYP3A4 substrate rivaroxaban and increasing its systemic exposure (AUC/Cmax). Neither agent is discussed as a prodrug here; rivaroxaban's active parent accumulates, increasing bleeding risk.
- Direction: increased rivaroxaban exposure and effect
- Onset: rapid
- Evidence: theoretical
- Severity: major
Management: Avoid CYP3A4 substrates, including rivaroxaban, within 2 weeks after a single topical application of abametapir. If concurrent use is unavoidable, avoid abametapir. If exposure occurs, monitor closely for bleeding signs.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
For a period of 2 weeks following abametapir application, refrain from using CYP3A4 substrates. Should avoiding these substrates not be possible, then abametapir should not be used1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
Both of these are usually not used together in the same window.
- Timing matters: The labeling advises avoiding CYP3A4 substrates like rivaroxaban for 2 weeks after applying abametapir. If that is not possible, the alternative is to avoid the abametapir treatment.
- Keep taking your rivaroxaban as prescribed unless your prescriber tells you otherwise. Do not stop your blood thinner on your own.
- Talk to your pharmacist or doctor before using the lice treatment so they can coordinate timing or choose another option.
- Watch for bleeding: unusual bruising, nosebleeds, blood in urine or stool, or bleeding that will not stop. Report these right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Rivaroxaban and Abametapir together?
Abametapir can raise rivaroxaban levels and bleeding risk, so avoid rivaroxaban for 2 weeks after applying abametapir, or skip the abametapir. Check with your pharmacist or doctor to coordinate timing before using both. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Rivaroxaban 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 Rivaroxaban and Abametapir interaction managed?
Both of these are usually not used together in the same window. Timing matters: The labeling advises avoiding CYP3A4 substrates like rivaroxaban for 2 weeks after applying abametapir. If that is not possible, the alternative is to avoid the abametapir treatment. Keep taking your rivaroxaban as prescribed unless your prescriber tells you otherwise. Do not stop your blood thinner on your own. Talk t… 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Rivaroxaban 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 Rivaroxaban
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Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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