Abametapir and Sunitinib: 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 recordSunitinib
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 gets into your body and can briefly block a liver enzyme called CYP3A4. That enzyme is one of the main ways your body clears sunitinib (Sutent), a cancer medicine.
If the enzyme is slowed down, sunitinib can build up higher than intended, which may raise the chance of side effects like high blood pressure, mouth sores, tiredness, or low blood counts. This effect is expected based on how the drugs work, and it can last up to 2 weeks after using the lotion. The good news is your care team can plan around this safely. Please talk with your oncologist or pharmacist before using abametapir.
Mechanism: Abametapir inhibits CYP3A4. Sunitinib is a CYP3A4 substrate (not a prodrug in a way that reverses this), so inhibition reduces its metabolism and increases exposure (AUC/Cmax).
- Direction: Increased sunitinib exposure, higher toxicity risk (hypertension, myelosuppression, mucositis, hand-foot syndrome, QT effects).
- Onset: Rapid; enzyme inhibition may persist up to 2 weeks post-application.
- Evidence: Theoretical, based on abametapir's known CYP3A4 inhibition.
- Management: Avoid CYP3A4 substrates within 2 weeks after abametapir application. If concomitant use is unavoidable, avoid abametapir. If exposure occurs, monitor closely and individualize sunitinib dosing per oncology.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
Within a 2-week window following abametapir administration, the use of CYP3A4 substrates should be avoided. Should that not be practical, abametapir itself should be avoided 1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
The documented guidance here is straightforward: avoid using abametapir lotion within 2 weeks of taking sunitinib. If avoiding the lice treatment is not feasible, the preferred choice is to not use abametapir and consider another option.
- Keep taking your sunitinib exactly as prescribed, do not stop or change it on your own.
- Before using any lice treatment, tell your oncologist or pharmacist you are on sunitinib.
- If abametapir has already been used, your team may monitor you more closely and adjust your sunitinib dose to fit your situation.
- Report new or worsening side effects such as high blood pressure, mouth sores, or unusual tiredness.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abametapir and Sunitinib together?
Abametapir can raise sunitinib levels by blocking the enzyme that clears it, so avoid using abametapir within 2 weeks of sunitinib; if lice treatment is needed, ask your care team about an alternative. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abametapir and Sunitinib 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 Sunitinib interaction managed?
The documented guidance here is straightforward: avoid using abametapir lotion within 2 weeks of taking sunitinib. If avoiding the lice treatment is not feasible, the preferred choice is to not use abametapir and consider another option. Keep taking your sunitinib exactly as prescribed, do not stop or change it on your own. Before using any lice treatment, tell your oncologist or pharmacist you ar… 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 Sunitinib 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 Sunitinib
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