Aripiprazole 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 recordAripiprazole
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 goes on your scalp, some of it can get into your body and slow down a liver enzyme called CYP3A4. That enzyme is one of the main ways your body breaks down aripiprazole (Abilify).
When that enzyme is slowed, aripiprazole can build up higher than usual. That could mean more side effects like drowsiness, dizziness, restlessness, or feeling shaky. The good news is this is very manageable. The main advice is to keep these two apart in time. Please don't stop or change either medicine on your own. Talk with your pharmacist or doctor, who can plan the safest timing for you.
Mechanism: Abametapir inhibits CYP3A4. Aripiprazole is a CYP3A4 (and CYP2D6) substrate, so inhibition reduces its clearance and increases exposure (AUC/Cmax). Neither agent is a prodrug in a way that reverses direction, so the effect is increased aripiprazole exposure.
- Direction: higher aripiprazole levels, greater risk of dose-related effects (sedation, EPS, akathisia, orthostasis, QT considerations).
- Onset: rapid.
- Evidence: theoretical, based on CYP3A4 inhibition.
- Management: avoid CYP3A4 substrates within 2 weeks of abametapir application; if that is not feasible, avoid abametapir. Consider individualized dosing and closer clinical monitoring if co-exposure is unavoidable.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
For a period of 2 weeks following administration of abametapir, refrain from using CYP3A4 substrates. Should that not be possible, abametapir should not be used 1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
The documented guidance is to keep these two apart in time.
- Timing: Avoid using a CYP3A4 substrate like aripiprazole within 2 weeks after applying abametapir. If avoiding aripiprazole is not feasible, the abametapir treatment may be avoided instead.
- Keep taking your prescribed aripiprazole as directed. Do not stop or change it on your own.
- Before treating lice, tell your pharmacist or prescriber you take aripiprazole so they can plan the safest option and monitor you more closely if needed.
Your care team can individualize this and watch for increased side effects if both are used close together.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Aripiprazole and Abametapir together?
Abametapir can raise aripiprazole levels by blocking the enzyme that clears it, so the labeling says to keep them at least 2 weeks apart. Tell your pharmacist or doctor before using abametapir so they can plan safe timing. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Aripiprazole 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 Aripiprazole and Abametapir interaction managed?
The documented guidance is to keep these two apart in time. Timing: Avoid using a CYP3A4 substrate like aripiprazole within 2 weeks after applying abametapir. If avoiding aripiprazole is not feasible, the abametapir treatment may be avoided instead. Keep taking your prescribed aripiprazole as directed. Do not stop or change it on your own. Before treating lice, tell your pharmacist or prescriber y… 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 Aripiprazole 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 Aripiprazole
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