Abametapir and Zolpidem: 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 recordZolpidem
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 on the scalp to treat head lice. Even though it goes on your skin, some can get into your body and briefly slow down a liver enzyme (called CYP3A4) that helps break down other medicines.
Zolpidem (Ambien) is cleared by that same enzyme. So after using abametapir, zolpidem may build up more than usual, which could make you feel more drowsy, dizzy, or groggy the next day. This is a theoretical concern, but it is taken seriously. The good news is your care team can easily manage the timing of these two, so please talk with your pharmacist or doctor before using them together.
Mechanism: Abametapir inhibits CYP3A4. Zolpidem is a CYP3A4 substrate (not a prodrug), so inhibition is expected to reduce its clearance and increase exposure (higher AUC/Cmax).
Direction / effect: Increased zolpidem exposure, with potential for enhanced sedation, next-day impairment, and psychomotor effects.
- Onset: rapid
- Evidence: theoretical
- Magnitude: not quantified
Management: Avoid CYP3A4 substrates, including zolpidem, for 2 weeks after abametapir application. If concurrent use is unavoidable, avoid abametapir. If exposure occurs, monitor for excessive sedation and individualize dosing.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
Do not administer CYP3A4 substrates during the 2 weeks following abametapir application. When avoiding such substrates is not possible, refrain from using abametapir instead1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
Both of these can usually be handled with good timing and communication with your care team.
- Spacing matters: The guidance is to avoid CYP3A4 medicines like zolpidem for about 2 weeks after using abametapir lotion, since the enzyme effect lasts a while.
- Talk first: Before using abametapir, tell your pharmacist or prescriber you take zolpidem. They may pause one, adjust timing, or choose an alternative.
- Watch for: extra drowsiness, dizziness, or morning grogginess if you do end up using both.
Keep taking your medicines as prescribed and do not stop anything on your own.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abametapir and Zolpidem together?
Abametapir can slow how your body clears zolpidem, so avoid zolpidem for about 2 weeks after using abametapir; check with your pharmacist or doctor to sort out the timing. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abametapir and Zolpidem 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 Zolpidem interaction managed?
Both of these can usually be handled with good timing and communication with your care team. Spacing matters: The guidance is to avoid CYP3A4 medicines like zolpidem for about 2 weeks after using abametapir lotion, since the enzyme effect lasts a while. Talk first: Before using abametapir, tell your pharmacist or prescriber you take zolpidem. They may pause one, adjust timing, or choose an alterna… 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 Zolpidem 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 Zolpidem
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