Colchicine and Rifampin: 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
Rifampin
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.
Colchicine is a medicine your body needs to clear out at a steady rate. When another drug interferes with how you get rid of it, colchicine can build up. Too much colchicine can cause serious problems like severe diarrhea, muscle weakness, and, in bad cases, life-threatening harm.
Your record flags rifampin as a drug that could change your colchicine levels. Because colchicine toxicity can be dangerous, this pairing is treated with a lot of caution. Please don't stop or change either medicine on your own. Talk with your pharmacist or doctor. They can decide the safest plan, adjust your colchicine dose if needed, and watch you closely.
Effect: Documented as increased colchicine exposure and risk of life-threatening colchicine toxicity. Colchicine is a CYP3A4 and P-gp substrate with a narrow safety margin.
- Mechanism on file: inhibition of P-gp-mediated colchicine efflux (theoretical for this pair).
- Evidence: theoretical; onset unspecified. Note: rifampin is classically a potent CYP3A4/P-gp inducer, so real-world PK direction may differ; the database rates this combination contraindicated based on the P-gp interaction class.
- Management: Contraindicated with renal or hepatic impairment. If use is required in patients with normal organ function, reduce colchicine daily dose or dosing frequency and monitor closely for toxicity (GI symptoms, myopathy, cytopenias).
What happens
Increased colchicine exposure and an increased risk of colchicine toxicity
Interaction Deep Dive
Colchicine serves as a substrate for both CYP3A4 and P-gp. Reports of toxicity have emerged when colchicine was given together with clarithromycin, which inhibits both CYP3A4 and P-gp. Similar toxic effects have been observed when colchicine was combined with a CYP3A4 inhibitor and when it was combined with a P-gp inhibitor3. Because life-threatening and fatal colchicine toxicity has been documented in patients taking therapeutic doses of colchicine alongside P-gp inhibitors, this combination is contraindicated 1. This combination is likewise contraindicated in individuals with renal or hepatic impairment, given that life-threatening and fatal drug interactions have been reported. For patients whose renal and hepatic function is normal 2, when colchicine must be given with a P-gp inhibitor, modify the colchicine dose by lowering either the daily amount or how often it is taken. 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
Keep taking both medicines exactly as prescribed until your care team reviews this. This combination is flagged as high-risk, so it deserves a direct conversation.
- Ask your pharmacist or prescriber whether these two should be taken together at all, especially if you have any kidney or liver problems (in that case it is not recommended).
- If they decide you do need both, your colchicine dose may be reduced or given less often, individualized by your team.
- Your team may monitor you more closely for colchicine toxicity.
- Report right away: severe diarrhea, vomiting, muscle pain or weakness, numbness, or unusual fatigue.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Colchicine and Rifampin together?
This colchicine and rifampin pairing is flagged as contraindicated because of a risk of dangerous colchicine buildup, so don't combine them without your prescriber's guidance, and get medical help fast for severe diarrhea, muscle weakness, or numbness. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Colchicine and Rifampin 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 Rifampin interaction managed?
Keep taking both medicines exactly as prescribed until your care team reviews this. This combination is flagged as high-risk, so it deserves a direct conversation. Ask your pharmacist or prescriber whether these two should be taken together at all, especially if you have any kidney or liver problems (in that case it is not recommended). If they decide you do need both, your colchicine dose may be… 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 Rifampin 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 Rifampin
Keep reading about Colchicine
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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