Abametapir and Zaleplon: 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 recordZaleplon
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.
Abametapir is a lotion used to treat head lice. Even though it's applied to your scalp, some of it gets into your body and can briefly block a liver enzyme called CYP3A4. That enzyme is one of the main ways your body breaks down zaleplon, a sleep medicine.
When that enzyme is slowed down, zaleplon can build up higher than usual. That could make you more drowsy, groggy, or unsteady, and those effects may linger longer. This is a caution based on how the drugs work rather than reports of harm, but it's worth taking seriously. The good news: your pharmacist or doctor can easily plan the timing so this isn't a problem.
Mechanism: Abametapir inhibits CYP3A4. Zaleplon is partially metabolized by CYP3A4 (primarily aldehyde oxidase, with a CYP3A4 contribution), so inhibition can increase zaleplon exposure (AUC/Cmax).
- Direction: Increased zaleplon exposure and enhanced/prolonged sedative, psychomotor, and CNS-depressant effects.
- Onset: Rapid; inhibition can persist for up to ~2 weeks after topical application.
- Evidence: Theoretical, based on CYP3A4 inhibition data.
- Management: Avoid CYP3A4 substrates such as zaleplon within 2 weeks of abametapir application; if unavoidable, avoid abametapir. Monitor for excess sedation if co-exposure occurs.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
Do not administer CYP3A4 substrates for a period of 2 weeks following the application of abametapir. Where avoiding such substrates is not practical, refrain from using abametapir instead1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
Both medicines can be used safely with a little planning. The key point is timing, because abametapir's enzyme-blocking effect can last up to two weeks after you apply it.
- Keep taking your medicines as prescribed and don't stop anything on your own.
- Tell your pharmacist or prescriber that you use (or plan to use) zaleplon before starting abametapir lice treatment.
- Your care team may separate these by avoiding zaleplon for about two weeks after the abametapir application, or choose an alternative approach for one of them.
- If you do end up using both, watch for extra drowsiness, grogginess, or unsteadiness and report it.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abametapir and Zaleplon together?
Abametapir can raise zaleplon levels and make it more sedating for up to two weeks after the lice treatment. Ask your pharmacist or doctor to help time these medicines so you avoid overlapping them. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abametapir and Zaleplon 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 Zaleplon interaction managed?
Both medicines can be used safely with a little planning. The key point is timing, because abametapir's enzyme-blocking effect can last up to two weeks after you apply it. Keep taking your medicines as prescribed and don't stop anything on your own. Tell your pharmacist or prescriber that you use (or plan to use) zaleplon before starting abametapir lice treatment. Your care team may separate these… 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 Zaleplon 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 Zaleplon
These medications also interact with supplements
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.
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist