Ciprofloxacin 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
Ciprofloxacin
No brand names on recordColchicine
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.
Ciprofloxacin can make colchicine build up in your body. Colchicine (Colcrys, Mitigare) is broken down by a liver enzyme called CYP3A4. Ciprofloxacin can slow that enzyme down, so your body clears colchicine more slowly and levels can rise higher than intended.
That matters because colchicine has a narrow safety window. Too much can cause serious problems like severe diarrhea, muscle weakness, and, in rare cases, dangerous toxicity. The good news is your care team can manage this easily, often by lowering your colchicine dose or watching you more closely. Please don't stop or change either medicine on your own, just talk with your pharmacist or doctor.
Effect: Ciprofloxacin (a CYP3A4 inhibitor) may reduce CYP3A4-mediated metabolism of colchicine, increasing colchicine exposure and the risk of fatal toxicity. Neither drug is a prodrug; this is a straightforward increase in the affected drug's levels.
- Severity: Major; evidence: theoretical; onset: unspecified.
- Management: Avoid combination where possible. If required, reduce colchicine dose/frequency: gout flare, 1.2 mg once (no repeat sooner than 3 days); prophylaxis, 0.6 mg BID to 0.6 mg daily, or 0.6 mg daily to 0.3 mg daily; FMF max 1.2 mg/day.
- Avoid entirely in renal or hepatic impairment. Monitor for colchicine toxicity (GI, myopathy, myelosuppression) and discontinue if suspected.
What happens
Increased colchicine exposure and an increased risk of fatal toxicity
Interaction Deep Dive
The simultaneous administration of colchicine with a moderate CYP3A4 inhibitor should be avoided, since this combination can elevate colchicine plasma levels and lead to fatal colchicine toxicity. When the two must be given together, the colchicine dose should be modified, either by lowering the total daily amount or by decreasing how often it is taken3. If coadministration is necessary, or if the drugs are used within 14 days of one another, the colchicine dose for treating a gout flare should be cut from the usual regimen of 1.2 mg (2 tablets) followed one hour later by 0.6 mg (1 tablet) to a single 1.2 mg (2 tablet) dose, and any repeat dose must wait at least 3 days. For preventing gout flares, the colchicine dose should be lowered from 0.6 mg twice daily to 0.6 mg daily, or from 0.6 mg once daily to 0.3 mg once daily. For patients who have familial Mediterranean fever and require concurrent colchicine and a moderate CYP3A4 inhibitor, the total daily colchicine dose must not exceed 1.2 mg (which may be administered as 0.6 mg twice daily). Watch for indications of colchicine toxicity and stop colchicine right away if such toxicity is suspected2. In addition, colchicine and moderate CYP3A4 inhibitors should not be used together in individuals with renal or hepatic impairment1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism of colchicine
How to manage this interaction
This combination can be managed by your care team. Because ciprofloxacin can raise colchicine levels, your team may take one or more of these steps:
- Choose a different antibiotic when possible.
- Lower your colchicine dose or how often you take it (for example, spacing out or reducing doses as your prescriber directs).
- Watch you more closely for signs of colchicine toxicity.
What you should do: Keep taking both exactly as prescribed unless told otherwise. Call your pharmacist or doctor right away if you notice severe diarrhea, vomiting, muscle weakness or pain, numbness, or unusual tiredness. Let them know if you have kidney or liver problems, since this combination is best avoided in that case.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
Common questions
Can I take Ciprofloxacin and Colchicine together?
Ciprofloxacin can raise colchicine levels and, at worst, cause serious toxicity, so your care team may avoid the combination, lower your colchicine dose, or monitor you closely. Watch for severe diarrhea, muscle weakness, or unusual fatigue and report them promptly. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Ciprofloxacin 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 Ciprofloxacin and Colchicine interaction managed?
This combination can be managed by your care team. Because ciprofloxacin can raise colchicine levels, your team may take one or more of these steps: Choose a different antibiotic when possible. Lower your colchicine dose or how often you take it (for example, spacing out or reducing doses as your prescriber directs). Watch you more closely for signs of colchicine toxicity. What you should do: Keep… 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Ciprofloxacin 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 (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 Ciprofloxacin
Keep reading about Colchicine
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