Amitriptyline and Arbutamine: 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
Arbutamine
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.
Arbutamine is a medicine used during a special heart stress test. It works by speeding up your heart rate to see how your heart handles stress, sort of like exercise in a controlled setting.
Amitriptyline (Elavil) can change your heart rate on its own. When the two are used together, the test may not give a true picture of how your heart is doing, so the results can be unreliable. This is not about harming you, it is about getting accurate test results. The good news is your care team knows about this. If you are scheduled for this kind of heart test, just let them know you take amitriptyline so they can plan the safest, most accurate approach for you.
Interaction: Concurrent tricyclic antidepressant (amitriptyline) therapy may render arbutamine pharmacologic stress test results unreliable.
- Mechanism: Amitriptyline exerts anticholinergic and adrenergic effects that alter baseline and stimulated heart rate, confounding the chronotropic response arbutamine is designed to produce.
- Direction: Pharmacodynamic interference with test interpretation, not a metabolic (PK) interaction. Neither agent is activated as a prodrug here.
- Onset: Rapid. Evidence: Probable. Severity: Moderate.
- Management: Per labeling, arbutamine should not be administered to patients on TCA therapy. Consider deferring the test or an alternative stress modality per the ordering physician.
What happens
Unreliable arbutamine test results
Interaction Deep Dive
Since arbutamine test results can be unreliable in patients taking a tricyclic antidepressant, arbutamine should not be given to such patients, as tricyclic antidepressants may influence heart rate1.
Why it happens (mechanism)
Alteration of heart rate by the tricyclic antidepressant
How to manage this interaction
This interaction is about test accuracy, not day-to-day danger from the two drugs together.
- Keep taking your amitriptyline as prescribed. Do not stop or change it on your own.
- If a heart stress test using arbutamine is planned, tell the ordering doctor, cardiologist, and pharmacist that you take amitriptyline.
- Because a tricyclic antidepressant can throw off the results, your care team will typically choose an alternative stress test approach or adjust the plan so the results are reliable.
Your team can manage this easily once they know your full medication list.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Arbutamine together?
Amitriptyline can make arbutamine heart stress test results unreliable, so tell your care team you take it; they will usually use a different testing approach. Keep taking your amitriptyline as prescribed unless your doctor says otherwise. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Arbutamine interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
How is the Amitriptyline and Arbutamine interaction managed?
This interaction is about test accuracy, not day-to-day danger from the two drugs together. Keep taking your amitriptyline as prescribed. Do not stop or change it on your own. If a heart stress test using arbutamine is planned, tell the ordering doctor, cardiologist, and pharmacist that you take amitriptyline. Because a tricyclic antidepressant can throw off the results, your care team will typica… 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 Amitriptyline or Arbutamine 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: GenESA(R), arbutamine hydrochloride. Gensia Automedics, Inc. San Diego, CA, 1997.
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