Abametapir and Clozapine: 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 recordClozapine
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 CYP1A2. That enzyme is one of the main ways your body clears clozapine. If it is slowed down, clozapine can build up higher than usual, which may increase side effects like heavy sedation, dizziness, drooling, low blood pressure, or a fast heartbeat.
The good news is this is very manageable. Because abametapir is usually a one-time lice treatment, this is mostly about timing. Please talk with your pharmacist or doctor before using abametapir so they can plan the safest approach for you.
Mechanism: Abametapir inhibits CYP1A2, a primary pathway for clozapine metabolism. Inhibition is expected to reduce clozapine clearance and increase its exposure (AUC/Cmax), raising the risk of dose-related toxicity (sedation, hypotension, tachycardia, seizures, orthostasis).
- Direction: increased clozapine effect (clozapine is an active drug, not a prodrug).
- Evidence: theoretical; magnitude not quantified.
- Onset: unspecified; enzyme inhibition from topical abametapir can persist.
Management: Avoid CYP1A2 substrates such as clozapine within 2 weeks after abametapir application. If concurrent use is unavoidable, avoid abametapir. Consider closer clinical monitoring and individualized dosing if exposure occurs.
What happens
Increased exposure of CYP1A2 substrates
Interaction Deep Dive
During the 2-week window following abametapir application, CYP1A2 substrates should not be used. When avoiding such substrates is not possible, refrain from using abametapir instead 1.
Why it happens (mechanism)
Inhibition of CYP1A2-mediated metabolism by abametapir
How to manage this interaction
Keep taking your clozapine exactly as prescribed. The main issue here is abametapir, a one-time lice lotion that can temporarily slow how you clear clozapine.
- Tell your pharmacist or prescriber that you take clozapine before using abametapir.
- Guidance is to avoid clozapine (a CYP1A2 drug) for about 2 weeks after applying abametapir; if that is not possible, the abametapir may be avoided and an alternative lice treatment chosen.
- If you do use both, your care team may monitor you more closely and individualize your clozapine dose.
Do not start or stop either medicine on your own. Let your team decide the safest plan and watch for extra sleepiness, dizziness, or a racing heart.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abametapir and Clozapine together?
Abametapir can block the enzyme that clears clozapine, potentially raising clozapine levels and side effects; avoid clozapine for about 2 weeks after using abametapir, and check with your pharmacist or doctor first. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abametapir and Clozapine interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Abametapir and Clozapine interaction managed?
Keep taking your clozapine exactly as prescribed. The main issue here is abametapir, a one-time lice lotion that can temporarily slow how you clear clozapine. Tell your pharmacist or prescriber that you take clozapine before using abametapir. Guidance is to avoid clozapine (a CYP1A2 drug) for about 2 weeks after applying abametapir; if that is not possible, the abametapir may be avoided and an alt… 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 Clozapine 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 Clozapine
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.
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