Colchicine and Zanubrutinib: 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
Zanubrutinib
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.
Let's talk about taking zanubrutinib (Brukinsa) together with colchicine. Colchicine leaves your body partly through a kind of cellular pump. Zanubrutinib can slow that pump down, so colchicine can build up higher than it should. That matters a lot because colchicine has a narrow safety window, and too much can cause serious, even life-threatening problems like severe diarrhea, muscle weakness, and blood or nerve issues.
Because of this, these two are generally not used together. The good news is your care team can manage this safely, either by adjusting your colchicine dose, watching you closely, or choosing a different option. Please don't change anything on your own talk with your pharmacist or doctor first.
Effect: Zanubrutinib inhibits P-gp, reducing P-gp-mediated efflux of colchicine and increasing colchicine exposure with risk of toxicity. Colchicine is a CYP3A4 and P-gp substrate; neither drug is a prodrug, so this raises active colchicine levels.
- Direction: increased colchicine AUC/Cmax, increased toxicity risk (myelosuppression, neuromyopathy, GI toxicity).
- Severity: contraindicated per labeling.
- Evidence: theoretical (extrapolated from documented P-gp inhibitor toxicities).
- Onset: unspecified.
- Management: avoid combination, especially in renal/hepatic impairment. If required with normal organ function, reduce colchicine daily dose or frequency and monitor closely for toxicity.
What happens
Increased colchicine exposure and an increased risk of colchicine toxicity
Interaction Deep Dive
Both CYP3A4 and P-gp act on colchicine as a substrate. Cases of toxicity have been documented when colchicine was given together with clarithromycin, an agent that inhibits both CYP3A4 and P-gp. Toxic effects have likewise been seen when colchicine was combined with a CYP3A4 inhibitor alone and when it was combined with a P-gp inhibitor alone3. Because life-threatening and fatal colchicine toxicity has been reported at therapeutic colchicine doses in such patients, combining colchicine with P-gp inhibitors is contraindicated 1. This combination is also contraindicated in individuals with renal or hepatic impairment, given that life-threatening and fatal drug interactions have been observed. When coadministration of colchicine with a P-gp inhibitor is necessary in patients whose renal and hepatic function is normal 2, adjust the colchicine dose, either by lowering the daily amount or by decreasing how often it is given. Watch carefully for signs of colchicine toxicity 3.
Why it happens (mechanism)
Inhibition of P-gp-mediated colchicine efflux transport
How to manage this interaction
Colchicine is a narrow-safety-window drug, so this combination is generally avoided. Keep taking both medications exactly as prescribed for now, and raise this pairing with your pharmacist or prescriber so they can plan.
Here is what a care team typically does:
- Avoids the combination when possible, and especially avoids it if you have kidney or liver problems.
- If both are truly needed and your kidney and liver function are normal, the colchicine dose may be adjusted and individualized by lowering the daily dose or spacing out doses.
- Monitors you more closely for signs of colchicine toxicity, such as severe diarrhea, nausea, muscle weakness, or unusual tiredness.
Report any of those symptoms promptly.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Colchicine and Zanubrutinib together?
Zanubrutinib can raise colchicine to dangerous levels, so this combination is generally contraindicated; do not change either drug on your own, but talk with your pharmacist or doctor, who can adjust the colchicine dose or choose a safer option. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Colchicine and Zanubrutinib interaction?
It is rated contraindicated. These should generally not be used together.
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 Zanubrutinib interaction managed?
Colchicine is a narrow-safety-window drug, so this combination is generally avoided. Keep taking both medications exactly as prescribed for now, and raise this pairing with your pharmacist or prescriber so they can plan. Here is what a care team typically does: Avoids the combination when possible, and especially avoids it if you have kidney or liver problems. If both are truly needed and your kid… 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 Zanubrutinib 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 (3)
- Product Information: LODOCO(R) oral tablets, colchicine oral tablets. AGEPHA Pharma USA, LLC (per FDA), Parsippany, NJ, 2023. DailyMed
- Product Information: COLCRYS oral tablets, colchicine oral tablets. Takeda Pharmaceuticals America Inc (per FDA), Deerfield, IL, 2020. DailyMed
- Product Information: GLOPERBA(R) oral solution, colchicine oral solution. Romeg Therapeutics LLC (per FDA), Woburn, MA, 2019. DailyMed
Keep reading about Zanubrutinib
Keep reading about Colchicine
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major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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