Drug interactions
Colchicine + Saquinavir
Severity: Major
Colchicine and Saquinavir: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Saquinavir, given with ritonavir, inhibits CYP3A4 and P-gp and increases colchicine exposure. This risks severe or fatal colchicine toxicity, particularly in organ impairment.
What this interaction means in plain words
Colchicine and Saquinavir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Boosted saquinavir inhibits CYP3A4 and P-gp, reducing colchicine clearance.
What to do
Avoid in renal or hepatic impairment. Otherwise reduce the colchicine dose or frequency per labeling and monitor for toxicity.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Colchicine
- Clarithromycin + Colchicine Contraindicated
- Cobicistat + Colchicine Contraindicated
- Colchicine + Cyclosporine Contraindicated
- Colchicine + Ensitrelvir Contraindicated
- Colchicine + Levoketoconazole Contraindicated
- Colchicine + Nirmatrelvir Contraindicated
Frequently asked questions
Can I take Colchicine with Saquinavir?
MediHelp rates the interaction as major. Colchicine and Saquinavir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Saquinavir, given with ritonavir, inhibits CYP3A4 and P-gp and increases colchicine exposure. This risks severe or fatal colchicine toxicity, particularly in organ impairment.
How serious is the interaction between Colchicine and Saquinavir?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid in renal or hepatic impairment. Otherwise reduce the colchicine dose or frequency per labeling and monitor for toxicity.
What other medicines interact with Colchicine?
MediHelp also lists interactions of Colchicine with, for example, Clarithromycin, Cobicistat, Cyclosporine. The full list is on the Colchicine page.
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