Vilanterol 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
Vilanterol
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.
Amitriptyline (Elavil) is a tricyclic antidepressant, and vilanterol is an inhaled medicine that helps open your airways. When taken together, both drugs can affect your heart's rhythm and, in theory, add up to a higher risk of a change in your heartbeat called QT prolongation. They can also make heart-related side effects like a fast or pounding heartbeat more likely.
I want to reassure you that this concern is based on how these medicines work, not on lots of real-world cases. Your care team can manage it by keeping a closer eye on you. Please don't stop either medicine on your own, just check in with your pharmacist or doctor.
Effect: Additive QT-interval prolongation and potentiation of adrenergic-driven cardiovascular effects (tachycardia, arrhythmia risk) when the TCA amitriptyline is combined with the long-acting beta-2 agonist vilanterol.
- Mechanism: Amitriptyline independently prolongs QT; vilanterol's beta-adrenergic stimulation adds cardiovascular strain and additive repolarization risk.
- Direction: Additive PD interaction (neither is a prodrug); increased cardiovascular/proarrhythmic effect.
- Evidence: Theoretical. Severity: Major. Onset: Unspecified; caution extends up to 2 weeks after TCA discontinuation.
- Management: Use with caution; consider ECG/QTc monitoring, electrolyte assessment, and review of other QT-prolonging agents.
What happens
Increased risk of cardiovascular adverse effects and an increased risk of QT interval prolongation
Interaction Deep Dive
Caution is warranted if vilanterol is given at the same time as tricyclic antidepressants that are recognized to prolong the QT interval, or within a 2 week window following the discontinuation of these agents. This is because such combinations can potentiate adrenergic-mediated cardiovascular effects and heighten the risk of QT interval prolongation, including ventricular arrhythmias1.
Why it happens (mechanism)
Potentiation of adrenergic agonist effects on the cardiovascular system; additive QT-interval prolongation
How to manage this interaction
Both medicines can be used together when your care team decides the benefit is worth it, but they will take some sensible precautions.
- Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise.
- Your team may monitor you more closely, which can include checking your heart rhythm (ECG) and electrolytes.
- Tell your prescriber about any palpitations, dizziness, fainting, or a very fast or irregular heartbeat.
- Mention any other medicines that affect heart rhythm, and note this caution can apply for up to 2 weeks after stopping amitriptyline.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Vilanterol and Amitriptyline together?
Combining amitriptyline and vilanterol can add up to a higher theoretical risk of heart-rhythm problems (QT prolongation), so keep taking both as prescribed and ask your care team about heart monitoring. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Vilanterol 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 Vilanterol and Amitriptyline interaction managed?
Both medicines can be used together when your care team decides the benefit is worth it, but they will take some sensible precautions. Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise. Your team may monitor you more closely, which can include checking your heart rhythm (ECG) and electrolytes. Tell your prescriber about any palpitations, dizziness, fainting, or a… 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 Vilanterol 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: ANORO(R) ELLIPTA(R) oral inhalation powder, umeclidinium vilanterol oral inhalation powder. GlaxoSmithKline (per FDA), Research Triangle Park, NC, 2022. DailyMed
Keep reading about Amitriptyline
Keep reading about Vilanterol
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