Colchicine and Abametapir: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Abametapir
No brand names on recordColchicine
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 slow down an enzyme (called CYP3A4) that your body uses to break down colchicine, your gout medicine.
When that enzyme is slowed, colchicine can build up higher than usual. That matters because colchicine is a drug where even small increases can cause serious problems, like stomach upset, muscle pain, or effects on blood counts. This is based mainly on how the drugs work rather than reported cases, but it is taken seriously. The good news is your care team can plan the timing so both are used safely.
Mechanism: Abametapir inhibits CYP3A4, reducing metabolism of the CYP3A4 substrate colchicine and increasing its systemic exposure (higher AUC/Cmax). Direction: increased colchicine effect and toxicity risk.
- Onset: rapid; inhibition can persist for up to 2 weeks after topical application.
- Evidence: theoretical (mechanism-based).
- Concern: colchicine has a narrow therapeutic index; elevated levels risk GI toxicity, myelosuppression, neuromuscular toxicity, and, in severe cases, multi-organ effects.
- Management: avoid CYP3A4 substrates, including colchicine, within 2 weeks of abametapir. If concomitant use is unavoidable, avoid abametapir. Individualize and monitor if exposure occurs.
What happens
Increased exposure of CYP3A4 substrate
Interaction Deep Dive
Refrain from administering CYP3A4 substrates for a period of 2 weeks following the application of abametapir. Should this not be practical, abametapir itself should not be used 1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by abametapir
How to manage this interaction
Keep taking your colchicine as prescribed and do not stop either medicine on your own. This is about timing and coordination with your care team.
- Tell your pharmacist or prescriber that you take colchicine before using abametapir lice lotion.
- The general guidance is to avoid CYP3A4 substrates like colchicine for 2 weeks after applying abametapir. If that is not feasible, the abametapir may be avoided instead.
- Your team may adjust timing, watch you more closely, or choose an alternative lice treatment.
- Report any new muscle pain, severe nausea, vomiting, or diarrhea promptly.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Colchicine and Abametapir together?
Abametapir can slow how you break down colchicine, raising colchicine levels for up to 2 weeks after use; do not combine them without your care team coordinating the timing or choosing another option. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Colchicine 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 Colchicine and Abametapir interaction managed?
Keep taking your colchicine as prescribed and do not stop either medicine on your own. This is about timing and coordination with your care team. Tell your pharmacist or prescriber that you take colchicine before using abametapir lice lotion. The general guidance is to avoid CYP3A4 substrates like colchicine for 2 weeks after applying abametapir. If that is not feasible, the abametapir may be avoi… 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 Colchicine 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 Colchicine
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