Sorafenib 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
Sorafenib
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 your heart's rhythm. Amitriptyline (Elavil) is an older antidepressant, and sorafenib (Nexavar) is a cancer medicine. Each one can slightly stretch out a part of your heartbeat called the QT interval. When you take them together, that effect can add up, which in rare cases can lead to a dangerous irregular heartbeat.
Please don't stop either medicine on your own. This is something your care team knows how to watch for. They may check your heart with an ECG and look at your blood mineral levels (like potassium and magnesium). Let your doctor or pharmacist know you take both so they can keep you safe.
Additive QT prolongation risk. Both amitriptyline (a TCA with known QT-prolonging potential) and sorafenib independently prolong the QT interval. The mechanism is pharmacodynamic and additive rather than metabolic; neither is a prodrug relevant here.
- Direction: increased combined QT prolongation and torsades risk
- Evidence: probable; severity major; onset unspecified
- Management: Avoid concomitant use where feasible. If co-administered, obtain baseline and periodic ECGs, monitor QTc, and correct/monitor electrolytes (K+, Mg2+, Ca2+). Consider an alternative agent if QTc prolongs.
Heightened caution with concurrent bradycardia, other QT-prolonging drugs, or predisposing cardiac disease.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Concurrent administration of SORAfenib with QT prolonging agents should be avoided because it can lead to prolongation of the QT interval1. Patients should have their electrocardiograms and electrolytes monitored21.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Keep taking both medicines as prescribed unless your doctor tells you otherwise. Here is how a care team typically manages this combination:
- They may try to avoid using both together when a suitable alternative exists.
- If both are needed, they may check your heart rhythm with an ECG before and during treatment.
- They may monitor your blood electrolytes (potassium, magnesium, calcium) and correct any that are low.
Tell your pharmacist or prescriber you take both, and report symptoms like fainting, dizziness, palpitations, or a racing/irregular heartbeat right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sorafenib and Amitriptyline together?
Taking amitriptyline and sorafenib together can add up to prolong your heart's QT interval, so your care team may avoid the combination or monitor your ECG and electrolytes closely. Keep taking both as prescribed and report any fainting or irregular heartbeat. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sorafenib 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 Sorafenib and Amitriptyline interaction managed?
Keep taking both medicines as prescribed unless your doctor tells you otherwise. Here is how a care team typically manages this combination: They may try to avoid using both together when a suitable alternative exists. If both are needed, they may check your heart rhythm with an ECG before and during treatment. They may monitor your blood electrolytes (potassium, magnesium, calcium) and correct an… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Sorafenib 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 (2)
Keep reading about Amitriptyline
Keep reading about Sorafenib
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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