Amitriptyline and Bepridil: 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
Bepridil
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) and bepridil can each affect the timing of your heartbeat. Doctors call this QT prolongation. When two drugs that both do this are taken together, the effect can add up and, in rare cases, lead to a dangerous irregular heartbeat.
Because of this, using these two medicines together is generally not recommended. The good news is that this is very manageable. Please don't stop either medicine on your own. Instead, reach out to your pharmacist or doctor. They can review your medicines and choose a safer combination or plan for you.
Interaction: Additive QT interval prolongation when amitriptyline is combined with bepridil.
- Mechanism: Both agents independently prolong cardiac repolarization (QT). Effect is pharmacodynamic and additive, raising torsades de pointes risk. Neither is a prodrug relevant to this effect.
- Direction: Additive increase in QT prolongation risk.
- Evidence: Theoretical; onset unspecified.
- Severity: Contraindicated.
- Management: Avoid concomitant use. If unavoidable, ECG and electrolyte (K+, Mg2+) monitoring, and dose individualization by the care team. Consider a non-QT-prolonging alternative.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Bepridil should not be administered together with medications known to prolong the QT interval, as this combination is contraindicated1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Because both medicines can affect your heart's rhythm, using them together is generally avoided. Here is how a care team typically handles this:
- They may choose an alternative medicine for one of the two so the effects don't add up.
- If both are truly needed, your team may monitor you more closely, including heart tracings (ECG) and blood tests.
What you should do:
- Keep taking both exactly as prescribed until you speak with your prescriber. Do not stop on your own.
- Tell your pharmacist or doctor you are on both, and report any fainting, dizziness, or a fluttering or racing heartbeat right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Bepridil together?
Amitriptyline and bepridil both prolong the QT interval, and combining them is contraindicated because the effects add up; contact your pharmacist or doctor to arrange a safer option rather than stopping anything yourself. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Bepridil interaction?
It is rated contraindicated. These should generally not be used together.
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 Bepridil interaction managed?
Because both medicines can affect your heart's rhythm, using them together is generally avoided. Here is how a care team typically handles this: They may choose an alternative medicine for one of the two so the effects don't add up. If both are truly needed, your team may monitor you more closely, including heart tracings (ECG) and blood tests. What you should do: Keep taking both exactly as presc… 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 Bepridil 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: Vascor(R) bepridil HCl. McNeil Pharmaceutical, Spring House, PA, 2000.
Keep reading about Amitriptyline
Keep reading about Bepridil
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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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