Vinflunine and Amitriptyline: 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
Amitriptyline
Vinflunine
No brand names on record
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.
Both of these medicines can affect the timing of your heartbeat. Doctors call this QT prolongation. Amitriptyline (Elavil) is an older antidepressant that can slightly stretch out this heart rhythm, and vinflunine, a chemotherapy drug, can do the same thing. When you take them together, those effects can add up and, in rare cases, lead to a dangerous heart rhythm.
Right now this concern is based mainly on how the drugs work rather than lots of reports of it actually happening, but it is still taken seriously. The good news is your care team can manage this. Please don't stop either medicine on your own, and talk with your doctor or pharmacist about your heart safety.
Effect: Additive risk of QT-interval prolongation when amitriptyline is coadministered with vinflunine.
Mechanism: Pharmacodynamic (additive), not pharmacokinetic. Both agents independently prolong the QT interval; combined use compounds the effect. Neither is a prodrug relevant here.
Evidence/onset: Theoretical basis; onset unspecified. Severity rated major.
Management:
- Combination is generally not recommended.
- If unavoidable, obtain a baseline ECG and perform on-treatment ECG monitoring.
- Monitor and correct electrolytes (K+, Mg2+, Ca2+).
- Assess for other QT-prolonging agents and bradycardia.
What happens
Increased risk of QT-interval prolongation
Interaction Deep Dive
Prolongation of the QT interval is a known effect of vinflunine. Using vinflunine together with other agents that also lengthen the QT interval may produce additive effects on QT prolongation, so this combination is not advised1. When such coadministration cannot be avoided, obtaining a baseline ECG and performing monitoring during treatment should be considered while vinflunine is given alongside other QT-prolonging drugs.
Why it happens (mechanism)
Additive QT interval effects
How to manage this interaction
Your care team knows how to handle this combination safely.
- Keep taking both medicines as prescribed unless your doctor tells you otherwise. Do not stop on your own.
- Because using them together is generally not recommended, your team may consider an alternative, or if the combination is needed, they may check a baseline ECG and monitor your heart during treatment.
- Your doctor may also check blood minerals like potassium and magnesium.
Tell your pharmacist or prescriber if you feel fainting, dizziness, palpitations, or a racing or irregular heartbeat, and mention any other medicines you take.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Vinflunine and Amitriptyline together?
Amitriptyline and vinflunine can both prolong the QT interval, and together the effect may add up, so this combination is generally avoided; if used together, expect ECG monitoring and report any dizziness or palpitations. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Vinflunine and Amitriptyline 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 Vinflunine and Amitriptyline interaction managed?
Your care team knows how to handle this combination safely. Keep taking both medicines as prescribed unless your doctor tells you otherwise. Do not stop on your own. Because using them together is generally not recommended, your team may consider an alternative, or if the combination is needed, they may check a baseline ECG and monitor your heart during treatment. Your doctor may also check blood… 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 Vinflunine or Amitriptyline 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 (1)
- Product Information: Javlor intravenous injection concentrate, vinflunine intravenous injection concentrate. Pierre Fabre Medicament (per EMA), Boulogne, France, 2012.
Keep reading about Amitriptyline
Keep reading about Vinflunine
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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