Remibrutinib and Colchicine: 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
Remibrutinib
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 a kind of pump (called P-gp) to move certain drugs out of your cells and gut. Colchicine relies on that pump. Remibrutinib can slow the pump down, so less colchicine gets pushed out and more can build up in your body.
Colchicine has a narrow safety range, meaning even a small rise in the amount in your blood can cause more side effects like stomach upset, diarrhea, nausea, or muscle problems. The good news is your care team knows how to handle this. They may check on you more often, and they can adjust your colchicine dose to keep you safe. Keep taking both exactly as prescribed and let your pharmacist or doctor know if you feel unwell.
Mechanism: Remibrutinib inhibits P-glycoprotein (P-gp) efflux transport. Colchicine is a P-gp substrate with a narrow therapeutic index, so reduced efflux increases colchicine exposure (higher Cmax/AUC).
- Direction: Increased colchicine effect and toxicity risk (GI toxicity, myelosuppression, neuromuscular effects).
- Magnitude: Not established for colchicine; a study using digoxin (P-gp substrate) with remibrutinib at 4x dose raised digoxin Cmax ~2.1-fold and AUC ~1.4-fold.
- Onset: Unspecified.
- Evidence: Theoretical for colchicine specifically.
- Management: Monitor more frequently for colchicine adverse reactions; individualize dose, with extra caution in renal or hepatic impairment.
What happens
Increased P-gp substrate exposure and an increased risk of P-gp substrates-related adverse reactions
Interaction Deep Dive
When remibrutinib, which inhibits P-gp, is taken together with P-gp substrates that have a narrow therapeutic index (NTI), the exposure to those substrates may rise. For P-gp substrates in which small shifts in concentration can trigger serious adverse reactions, increase the frequency of monitoring for adverse reactions during combined use with remibrutinib. A drug interaction study showed that giving remibrutinib at four times the recommended dose alongside a single 0.25 mg dose of digoxin (a P-gp substrate) raised digoxin Cmax by 2.1-fold and AUC by 1.4-fold1.
Why it happens (mechanism)
Inhibition of P-gp-mediated efflux transport of remibrutinib
How to manage this interaction
This is manageable with the right monitoring. Because remibrutinib can raise colchicine levels, your care team will watch you more closely for signs of colchicine side effects.
- Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Your colchicine dose may need to be adjusted and individualized by your care team.
- Watch for and report diarrhea, nausea, vomiting, stomach pain, unusual muscle weakness or pain, or signs of infection.
- Tell your pharmacist and doctor about all your medicines, especially if you have kidney or liver problems.
Bring up any new or worsening symptoms with your pharmacist or prescriber right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In a study evaluating drug interactions, giving remibrutinib at four times the recommended dose together with a single 0.25 mg dose of digoxin (a P-gp substrate) raised digoxin Cmax by 2.1-fold and AUC by 1.4-fold 1.
Common questions
Can I take Remibrutinib and Colchicine together?
Remibrutinib can raise colchicine levels by slowing the P-gp pump, which may increase colchicine side effects. Keep taking both as prescribed and let your care team monitor you and adjust your colchicine dose as needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Remibrutinib and Colchicine 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 Remibrutinib and Colchicine interaction managed?
This is manageable with the right monitoring. Because remibrutinib can raise colchicine levels, your care team will watch you more closely for signs of colchicine side effects. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your colchicine dose may need to be adjusted and individualized by your care team. Watch for and report diarrhea, nausea, vomiting… 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 Remibrutinib or Colchicine 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: RHAPSIDO® oral tablets, remibrutinib oral tablets. Novartis Pharmaceuticals Corporation (per FDA), East Hanover, NJ, 2025. DailyMed
Keep reading about Colchicine
Keep reading about Remibrutinib
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