Why does colchicine cause diarrhea?

Colchicine's mechanism of action involves disrupting microtubule formation in cells. GI cells divide rapidly and are particularly sensitive. Diarrhea, nausea, and cramping are dose-dependent — they are most severe at high historical doses (now outdated) and much better tolerated with the modern low-dose regimen (1.2 mg then 0.6 mg for acute gout). If diarrhea is severe, stop the dose and call your prescriber.

Can I take colchicine long-term?

Yes. Colchicine is safe for long-term use at low doses (0.6 mg once or twice daily) for gout prophylaxis and FMF (familial Mediterranean fever). Long-term use requires monitoring for bone marrow suppression (CBC) and neuromuscular toxicity if combined with statins or other interacting drugs.

Can I take colchicine with my statin (e.g., atorvastatin)?

This combination requires caution. Both colchicine and statins can cause muscle toxicity. Together, the risk is increased. Some statins interact pharmacokinetically with colchicine (by inhibiting CYP3A4 or P-glycoprotein). This combination is not absolutely contraindicated, but your prescriber should be aware and you should report any muscle pain promptly.

Is colchicine the same as an NSAID or steroid for gout?

No. Colchicine works through a completely different mechanism — it disrupts the NLRP3 inflammasome pathway activated by uric acid crystals, reducing the inflammatory signaling cascade. NSAIDs (like indomethacin) block prostaglandins, and steroids broadly suppress immune function. All three work but have different side effect profiles and indications.

What to Expect When Starting Colchicine

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Introduction

Colchicine is an anti-inflammatory agent derived from the crocus plant, used to treat and prevent acute gout flares and pericarditis (inflammation around the heart). It works by disrupting the inflammatory cascade triggered by uric acid crystals. For acute gout, it is most effective when started within the first 12-24 hours of flare onset. It is also used as prophylaxis when starting urate-lowering therapy.

Week-by-week timeline

Day 1 (Acute Gout)

Starting for an Acute Flare

For acute gout, the modern low-dose regimen is 1.2 mg at the first sign of flare, followed by 0.6 mg one hour later (total 1.8 mg). This is as effective as high doses but much better tolerated. Start within 12-36 hours of flare onset for best results. GI side effects (nausea, diarrhea, cramping) are dose-dependent.

Day 2-5 (Acute Flare)

Flare Resolution

Joint pain, swelling, and redness should improve over 2-5 days with effective treatment. Some patients continue colchicine 0.6 mg once or twice daily until the flare fully resolves (typically 1-2 weeks total). Reduce and stop as the flare resolves.

Week 1-12 (Prophylaxis)

Gout Flare Prevention

When starting allopurinol or febuxostat, colchicine 0.6 mg once or twice daily is prescribed as prophylaxis for the first 3-6 months. This prevents the paradoxical gout flares that occur as uric acid levels shift. Take consistently throughout the prophylaxis period.

Month 1-3 (Pericarditis)

Pericarditis Treatment

For pericarditis, colchicine is used alongside NSAIDs for 3-6 months to reduce recurrence. Doses are 0.5 mg twice daily (or once daily if under 70 kg). Maintaining therapy for the full course dramatically reduces recurrence risk.

Month 3+ (Pericarditis)

Tapering and Completion

For pericarditis, colchicine is tapered based on CRP normalization and symptom resolution. Complete the prescribed course — stopping early increases recurrence risk significantly.

When to call your doctor

Contact your healthcare provider if you experience:

Severe diarrhea, nausea, vomiting, or abdominal cramping that is severe or worsening (GI toxicity)
Muscle pain, weakness, or dark urine (myopathy or rhabdomyolysis — especially with statin or cyclosporine combination)
Unusual bruising or bleeding (bone marrow suppression — rare, more common with renal impairment)
Numbness or tingling in hands or feet (neurotoxicity)
Signs of severe allergic reaction
Fever with decreased urine output (signs of serious toxicity)

Tips for getting started

Take colchicine at the first sign of a gout flare for the best results — early treatment is dramatically more effective than late treatment. Start within 12-24 hours of onset. Take with food to reduce GI side effects. Grapefruit juice and St. John's Wort significantly alter colchicine levels — avoid both. Many medications interact with colchicine: statins, cyclosporine, certain antibiotics, and antifungals increase colchicine toxicity risk. Always provide a full medication list to your prescriber. Patients with kidney or liver disease require dose adjustments.

Frequently asked questions

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References

[Regulatory] FDA Label: Colcrys (colchicine) Tablets https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/022352lbl.pdf Accessed 2026-03-01.
[Regulatory] NIH MedlinePlus: Colchicine https://medlineplus.gov/druginfo/meds/a682711.html Accessed 2026-03-01.
[Regulatory] ACR 2020 Gout Guidelines: Colchicine Prophylaxis https://www.rheumatology.org/Practice-Quality/Clinical-Support/Clinical-Practice-Guidelines/Gout Accessed 2026-03-01.

Written and fact-checked by PrescriptionDrugs.org Editorial Team

Last updated: March 1, 2026