Levacetylleucine 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
Levacetylleucine
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. Colchicine is handled by a kind of cellular 'pump' called P-gp that helps move the drug out of your body. Levacetylleucine (Aqneursa) can slow that pump down. When the pump slows, more colchicine can build up in your system, which may mean a higher chance of colchicine side effects like nausea, diarrhea, belly cramps, or muscle aches.
The good news: this concern is mostly theoretical right now, and it's very manageable. Keep taking both medicines exactly as prescribed, and let your pharmacist or doctor know you're on both so they can watch you a little more closely and adjust things if needed.
Mechanism: Levacetylleucine inhibits P-glycoprotein (P-gp)-mediated efflux. Colchicine is a P-gp substrate, so reduced efflux can raise colchicine systemic exposure (AUC/Cmax) and the risk of substrate-related toxicity.
- Direction: Increased colchicine effect/exposure (neither drug is a prodrug here).
- Magnitude: Not quantified; theoretical evidence only.
- Onset: Unspecified.
- Management: Monitor more frequently for colchicine adverse effects (GI toxicity, myopathy, cytopenias); dose may need individualization. Use added caution in renal/hepatic impairment or with other P-gp inhibitors.
What happens
Increased P-gp inhibitor exposure and an increased risk of P-gp substrate-related adverse reactions
Interaction Deep Dive
Giving levacetylleucine together with P-gp substrates may raise the exposure to those P-gp substrates and can heighten the likelihood of adverse reactions linked to the P-gp substrates. When these agents are taken alongside levacetylleucine, watch more closely for adverse reactions associated with the P-gp substrate1.
Why it happens (mechanism)
Inhibition of P-gp-mediated efflux transport by levacetylleucine
How to manage this interaction
What your care team may do:
- Keep you on both medicines while monitoring you more closely for colchicine side effects (nausea, vomiting, diarrhea, muscle pain or weakness).
- Adjust and individualize your colchicine dose if needed, based on how you respond.
What you can do:
- Take both exactly as prescribed unless told otherwise.
- Tell your pharmacist or prescriber you take both, and report any new stomach upset, muscle aches, or unusual weakness.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Levacetylleucine and Colchicine together?
Levacetylleucine may raise colchicine levels by slowing the P-gp pump, so watch for colchicine side effects and let your care team monitor and adjust as needed. This concern is currently theoretical. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Levacetylleucine and Colchicine interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Levacetylleucine and Colchicine interaction managed?
What your care team may do: Keep you on both medicines while monitoring you more closely for colchicine side effects (nausea, vomiting, diarrhea, muscle pain or weakness). Adjust and individualize your colchicine dose if needed, based on how you respond. What you can do: Take both exactly as prescribed unless told otherwise. Tell your pharmacist or prescriber you take both, and report any new stom… 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 Levacetylleucine 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 anything you'd monitor while I'm on both?
References (1)
- Product Information: AQNEURSA(TM) oral suspension, levacetylleucine oral suspension. IntraBio Inc. (per FDA), Austin, TX, 2024. DailyMed
Keep reading about Colchicine
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