Buprenorphine 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
Buprenorphine
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.
Both of these medicines can affect your heart's rhythm. Buprenorphine (a pain or addiction medicine) and bepridil (an older heart medicine) can each slow down the way your heart's electrical system resets between beats. Doctors call this QT prolongation. When two drugs that do this are taken together, the effect can add up and, in rare cases, lead to a dangerous irregular heartbeat.
Because of this, these two are generally not used together. The good news is your care team can manage this easily by choosing a safer option. If you have been prescribed both, don't stop anything on your own, just reach out to your pharmacist or doctor so they can sort out the safest plan for you.
Additive QT-interval prolongation. Both agents independently prolong cardiac repolarization; bepridil is a known QT-prolonging antiarrhythmic, and buprenorphine carries dose-related QT risk. Combined use raises the risk of torsades de pointes.
- Mechanism: additive pharmacodynamic QT prolongation (not a metabolic/prodrug interaction).
- Direction: increased arrhythmia risk.
- Evidence: theoretical, but severity on file is contraindicated.
- Onset: unspecified.
- Management: combination is contraindicated. Select an alternative agent. If co-use is unavoidable, ECG and electrolyte (K+, Mg2+) monitoring and specialist input are warranted.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Bepridil should not be given 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
This combination is flagged as one to avoid. Because both drugs can lengthen the QT interval, care teams generally do not use them together and instead choose a safer alternative for one of them.
- Keep taking both exactly as prescribed until you have spoken with a professional. Do not stop either drug on your own.
- Tell your pharmacist or prescriber that you have been prescribed both so they can review your regimen.
- Mention any history of heart rhythm problems, fainting, or a family history of sudden cardiac issues.
- Your team may run an ECG and check your potassium and magnesium if any overlap is needed.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Bepridil together?
Buprenorphine and bepridil can both prolong the QT interval, and using them together is considered contraindicated. Contact your pharmacist or doctor so they can pick a safer alternative. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine 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 Buprenorphine and Bepridil interaction managed?
This combination is flagged as one to avoid. Because both drugs can lengthen the QT interval, care teams generally do not use them together and instead choose a safer alternative for one of them. Keep taking both exactly as prescribed until you have spoken with a professional. Do not stop either drug on your own. Tell your pharmacist or prescriber that you have been prescribed both so they can rev… 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.
Questions for your pharmacist
- Does my dose of Buprenorphine 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 Buprenorphine
Keep reading about Bepridil
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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