Amiodarone 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 recordAmiodarone
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 it's applied to the scalp, some of it can get into your body and briefly slow down a liver enzyme called CYP3A4. Your body uses that same enzyme to break down amiodarone, a heart rhythm medicine.
When the enzyme is slowed, amiodarone can build up more than expected. Since amiodarone is a powerful heart drug where even small changes matter, higher levels could raise the chance of side effects. The good news is this is manageable. Talk with your pharmacist or doctor before using the lice treatment so they can plan the timing safely.
Mechanism: Abametapir is a CYP3A4 inhibitor; amiodarone is a CYP3A4 substrate. Inhibition reduces amiodarone metabolism, increasing its exposure (AUC/Cmax).
- Direction: Increased amiodarone effect and toxicity risk.
- Onset: Rapid.
- Evidence: Theoretical (based on CYP3A4 inhibition profile).
- NTI concern: Amiodarone is narrow therapeutic index with a long half-life; even modest exposure increases warrant caution (QT prolongation, bradycardia).
Management: Avoid CYP3A4 substrates for 2 weeks after a single abametapir application. If concurrent use is unavoidable, avoid abametapir. Monitor for amiodarone-related toxicity if exposure occurs.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
Within a 2-week window following the application of abametapir, CYP3A4 substrates should not be used. When avoiding such substrates is not possible, abametapir itself should be avoided instead1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
What your care team may do:
- Space these out. Abametapir's enzyme-blocking effect can last a while, so guidance is to avoid CYP3A4 substrates like amiodarone for 2 weeks after applying abametapir.
- If avoiding the overlap isn't possible, the preferred choice is to not use abametapir (an alternative lice treatment may be chosen).
What you should do:
- Keep taking your amiodarone as prescribed. Do not stop it on your own.
- Before using any lice treatment, tell your pharmacist or doctor you take amiodarone so they can pick a safe option and timing.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amiodarone and Abametapir together?
Abametapir can raise amiodarone levels by blocking the enzyme that clears it, so avoid the lice lotion within 2 weeks of taking amiodarone, or choose a different lice treatment. Check with your pharmacist or doctor first. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amiodarone 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 Amiodarone and Abametapir interaction managed?
What your care team may do: Space these out. Abametapir's enzyme-blocking effect can last a while, so guidance is to avoid CYP3A4 substrates like amiodarone for 2 weeks after applying abametapir. If avoiding the overlap isn't possible, the preferred choice is to not use abametapir (an alternative lice treatment may be chosen). What you should do: Keep taking your amiodarone as prescribed. Do not s… 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 Amiodarone 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 Amiodarone
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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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