Amitriptyline and Sunitinib: 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
Sunitinib
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.
Amitriptyline (Elavil) and sunitinib (Sutent) can each affect your heart's electrical rhythm in a small way. When taken together, those effects may add up, which can lengthen a part of the heartbeat called the QT interval. In rare cases, that can lead to a dangerous irregular heartbeat.
This concern is mostly based on how these drugs work, not on lots of real-world reports, so try not to worry. Your care team can manage this safely. Tell your pharmacist or doctor if you feel your heart racing, skipping beats, or if you feel dizzy or faint, and keep taking both medicines exactly as prescribed unless your doctor tells you otherwise.
Interaction: Additive QT-prolonging potential when amitriptyline and sunitinib are co-administered, raising the risk of QTc prolongation and, rarely, torsades de pointes.
- Mechanism: Pharmacodynamic (additive), not a prodrug or metabolic interaction; both agents independently affect cardiac repolarization.
- Direction/magnitude: Additive QTc effect; magnitude not quantified.
- Onset: Unspecified.
- Evidence: Theoretical; severity rated major.
- Management: Use with caution. Consider baseline and periodic ECG, correct electrolytes (K+, Mg2+), review other QT-prolonging agents, and monitor for symptoms. Dose may be individualized by the care team.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Concurrent administration of amitriptyline with sunitinib warrants caution, as the two agents may exert additive effects on the QT interval, raising the risk of serious cardiovascular events1.
Why it happens (mechanism)
Additive effects on the QT interval
How to manage this interaction
Your care team can manage this combination safely with sensible precautions.
- Keep taking both medicines as prescribed unless your prescriber tells you otherwise.
- Your team may monitor you more closely, which can include an ECG (heart tracing) and blood tests to check electrolytes like potassium and magnesium.
- Doses may be adjusted and individualized by your care team.
- Tell your pharmacist about all your other medicines, since some can also affect heart rhythm.
Seek prompt care if you feel palpitations, fainting, severe dizziness, or an irregular heartbeat.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Sunitinib together?
Taking amitriptyline and sunitinib together may add up to prolong the QT interval and raise the risk of a serious irregular heartbeat, so your care team may monitor your heart rhythm and electrolytes; keep taking both as prescribed and report palpitations, dizziness, or fainting. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Sunitinib 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 Amitriptyline and Sunitinib interaction managed?
Your care team can manage this combination safely with sensible precautions. Keep taking both medicines as prescribed unless your prescriber tells you otherwise. Your team may monitor you more closely, which can include an ECG (heart tracing) and blood tests to check electrolytes like potassium and magnesium. Doses may be adjusted and individualized by your care team. Tell your pharmacist about al… 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 Amitriptyline or Sunitinib 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: SUTENT(R) oral capsules, sunitinib malate oral capsules. Pfizer Labs (per FDA), New York, NY, 2011. DailyMed
Keep reading about Amitriptyline
Keep reading about Sunitinib
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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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