Colchicine and Tovorafenib: 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
Colchicine
Tovorafenib
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. Your body uses an enzyme called CYP3A to break down colchicine. Tovorafenib can speed up that enzyme, so it may clear colchicine out of your body faster than usual. That could leave less colchicine working for you, which may mean it doesn't control your gout or other symptoms as well as it should.
I want to be honest that this concern is based mostly on how these drugs are expected to behave, not on lots of real-world cases. So please don't stop or change anything on your own. Just let your pharmacist or doctor know you take both, and they can watch how well your colchicine is working and adjust things if needed.
Mechanism: Tovorafenib is a CYP3A inducer; colchicine is a CYP3A4 substrate (not a prodrug). Induction is expected to increase colchicine clearance, lowering its exposure (AUC/Cmax) and potentially reducing therapeutic efficacy.
- Direction: Reduced colchicine effect (loss of efficacy).
- Magnitude: Not quantified for colchicine; a model-informed study predicted midazolam Cmax/AUC decreases of at least 20%.
- Onset: Unspecified.
- Evidence: Theoretical.
- Management: Avoid coadministration where reduced exposure risks therapeutic failure. If unavoidable, monitor for loss of colchicine efficacy; dose may need individualization by the care team.
What happens
Reduced CYP3A substrate with NTI exposure and reduced efficacy of CYP3A substrate with NTI
Interaction Deep Dive
Do not give tovorafenib (a CYP3A inducer) together with certain CYP3A substrates in situations where even small shifts in concentration could cause serious loss of therapeutic effect. When tovorafenib is used alongside CYP3A substrates that have a narrow therapeutic index (NTI), exposure to the NTI CYP3A substrate may fall, potentially diminishing its efficacy. Should coadministration be necessary, watch patients for reduced effectiveness. A model informed drug interaction study predicted that steady-state Cmax and AUC of midazolam (a CYP3A4 substrate) would drop by at least 20% when it is given with tovorafenib1.
Why it happens (mechanism)
Induction of CYP3A-mediated metabolism by tovorafenib
How to manage this interaction
The good news is your care team can manage this. The main concern is that tovorafenib may make colchicine less effective by helping your body clear it faster.
- Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise.
- Your team may prefer to avoid using them together when possible, or watch you more closely if you must take both.
- Tell your pharmacist and doctor you take both so they can monitor whether your colchicine is still working and individualize your dose if needed.
- Report any return or worsening of the symptoms colchicine is meant to control.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Using a model informed approach in a drug interaction study, the steady-state Cmax and AUC of midazolam (a CYP3A4 substrate) are predicted to decrease by at least 20% when it is coadministered with tovorafenib 1.
Common questions
Can I take Colchicine and Tovorafenib together?
Tovorafenib may lower how well colchicine works by speeding up its breakdown, so tell your care team you take both; they may avoid the combination or watch closely to be sure your colchicine is still effective. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Colchicine and Tovorafenib 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 Tovorafenib interaction managed?
The good news is your care team can manage this. The main concern is that tovorafenib may make colchicine less effective by helping your body clear it faster. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise. Your team may prefer to avoid using them together when possible, or watch you more closely if you must take both. Tell your pharmacist and doctor… 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 Tovorafenib 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: OJEMDA oral tablets, oral suspension, tovorafenib oral tablets, oral suspension. Day One Biopharmaceuticals, Inc.(Per FDA), Brisbane, CA, 2024. DailyMed
Keep reading about Colchicine
Keep reading about Tovorafenib
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major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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