Colchicine and Mitotane: 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
Mitotane
Colchicine
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.
Here's what's going on. Mitotane (Lysodren) speeds up an enzyme in your liver called CYP3A4. That same enzyme breaks down colchicine. So when you take both, your body may clear colchicine faster than usual, leaving less of it in your system. That could mean colchicine doesn't work as well to control your gout or other condition it was prescribed for.
The good news is that this is very manageable. Your care team can watch how well the colchicine is working and adjust your dose if needed. Please don't change anything on your own, just let your pharmacist or doctor know you take both so they can tailor your plan.
Mechanism: Mitotane is a strong CYP3A4 inducer; colchicine is a CYP3A4 substrate. Induction increases colchicine metabolism, lowering plasma exposure (AUC/Cmax) and potentially reducing efficacy.
- Direction: Reduced colchicine effect (therapeutic failure risk).
- Onset: Unspecified; enzyme induction is typically delayed and may persist after mitotane discontinuation given its long half-life.
- Evidence: Theoretical.
- Management: Avoid combination where subtherapeutic colchicine risks failure. If unavoidable, increase colchicine dose as clinically appropriate and monitor therapeutic response.
Note colchicine has a narrow therapeutic index, so titrate cautiously.
What happens
Reduced CYP3A substrate with NTI exposure and reduced efficacy of CYP3A substrate with NTI exposure
Interaction Deep Dive
Because mitotane acts as a potent inducer of CYP3A, using it alongside CYP3A substrates can lower the levels of those substrates and thereby diminish their effectiveness. For CYP3A substrates in which even small drops in concentration can result in therapeutic failure, coadministration with mitotane should be avoided. When such combined use is unavoidable, raise the dose of the CYP3A substrate as appropriate1.
Why it happens (mechanism)
Induction of CYP3A4-substrate metabolism by mitotane
How to manage this interaction
What your care team may do:
- Consider whether the two drugs can be avoided together, since reduced colchicine levels could make it less effective.
- If both are needed, your colchicine dose may need to be adjusted and individualized by your care team.
- They may monitor how well your symptoms are controlled and respond if the colchicine seems to be working less well.
What you should do:
- Keep taking both exactly as prescribed unless told otherwise.
- Tell your pharmacist or prescriber that you take both, and report if your gout or symptoms flare or seem uncontrolled.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Colchicine and Mitotane together?
Mitotane can speed up how your body clears colchicine, which may make colchicine less effective. Your care team can manage this by adjusting your dose and monitoring how well it works, so keep taking both as prescribed and keep them informed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Colchicine and Mitotane 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 Colchicine and Mitotane interaction managed?
What your care team may do: Consider whether the two drugs can be avoided together, since reduced colchicine levels could make it less effective. If both are needed, your colchicine dose may need to be adjusted and individualized by your care team. They may monitor how well your symptoms are controlled and respond if the colchicine seems to be working less well. What you should do: Keep taking bot… 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 Mitotane 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: LYSODREN(R) oral tablets, mitotane oral tablets. HRA Pharma Rare Diseases (per FDA), New York, NY, 2024. DailyMed
Keep reading about Mitotane
Keep reading about Colchicine
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