Drug Interaction Report

Buprenorphine and Acecainide: Interaction Details

A pharmacist-reviewed analysis of the Buprenorphine and Acecainide interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

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

Belbuca Brixadi Buprenex BuTrans Simbadol Sublocade Zorbium
+

Acecainide

No brand names on record
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Jul 2, 2026
Editorial policy · Data sources
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Interaction severity
Major
Potentially serious — often needs a change or close monitoring.
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.

Of 633 documented Buprenorphine interactions, 601 are rated major — including this one.
Worried about symptoms right now? Contact your pharmacist or prescriber, or call Poison Control at 1-800-222-1222 (US). Call 911 for an emergency.
At a glance + Theoretical Effects may be stronger
The Bottom Line
Combining buprenorphine and acecainide can add up to prolong the QT interval, so this pairing is usually avoided; talk with your doctor or pharmacist about the safest option and let them monitor your heart if both are needed.

Both of these medicines can affect your heart's rhythm. Buprenorphine (a pain or addiction medicine) and acecainide (a heart rhythm medicine) can each 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.

This concern is based on how the drugs work rather than lots of real-world reports, so please don't panic. Never stop either medicine on your own. Just let your doctor or pharmacist know you take both so they can decide the safest plan and keep an eye on your heart.

Additive QT prolongation risk. Buprenorphine has known QT-prolonging potential, and acecainide (N-acetylprocainamide), a class III antiarrhythmic metabolite, prolongs repolarization by blocking potassium currents. Combined use produces additive effects on the QT interval, increasing torsades de pointes risk.

  • Direction: additive pharmacodynamic effect (not a metabolic/prodrug interaction).
  • Evidence: theoretical; onset unspecified.
  • Severity: major.
  • Management: avoid concomitant use where possible. If unavoidable, obtain baseline and follow-up ECGs, monitor QTc, correct electrolytes (K+, Mg2+), and review other QT-prolonging agents. Individualize therapy with cardiology input.
Onset
unspecified
Evidence
theoretical
Severity
Major

What happens

Increased risk of QT prolongation

Interaction Deep Dive

The combined use of buprenorphine with class III antiarrhythmics should be avoided, because such a pairing can heighten the likelihood of QT prolongation231.

Why it happens (mechanism)

Additive effects on the QT interval

How to manage this interaction

The main strategy here is to avoid using these two together when possible. Your care team may choose an alternative to one of the medicines, or if both are truly needed, they can watch your heart more closely.

  • Keep taking both exactly as prescribed unless your doctor tells you otherwise.
  • Ask your prescriber or pharmacist whether an alternative is appropriate.
  • Your team may check your heart rhythm with an ECG and your electrolytes.
  • Report fainting, dizziness, or a fluttering or pounding heartbeat right away.

Management is individual — confirm any change with your pharmacist or prescriber.

Common questions

Can I take Buprenorphine and Acecainide together?

Combining buprenorphine and acecainide can add up to prolong the QT interval, so this pairing is usually avoided; talk with your doctor or pharmacist about the safest option and let them monitor your heart if both are needed. Always confirm with your pharmacist or prescriber before making any change.

How serious is the Buprenorphine and Acecainide 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 Buprenorphine and Acecainide interaction managed?

The main strategy here is to avoid using these two together when possible. Your care team may choose an alternative to one of the medicines, or if both are truly needed, they can watch your heart more closely. Keep taking both exactly as prescribed unless your doctor tells you otherwise. Ask your prescriber or pharmacist whether an alternative is appropriate. Your team may check your heart rhythm… 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 Acecainide 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 (3)

  1. Product Information: BUTRANS(R) transdermal system patch, buprenorphine transdermal system patch. Purdue Pharma L.P. (per FDA), Stamford, CT, 2016. DailyMed
  2. Product Information: BELBUCA(TM) buccal film, buprenorphine buccal film. Endo Pharmaceuticals Inc. (per FDA), Malvern, PA, 2016.
  3. Product Information: BUPRENEX(R) intravenous injection, intramuscular injection, buprenorphine HCl intravenous injection, intramuscular injection. Indivior Inc. (per DailyMed), Richmond, VA, 2016. DailyMed
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Buprenorphine

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Acecainide

Keep reading about Acecainide

All Acecainide interactions (23)
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Beyond drug–drug

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:

Buprenorphine + 1,4-butanediol Activated Charcoal Beer Gamma-hydroxybutyrate (ghb) Grapefruit Kava L-tryptophan Lithium + 206 more

major · moderate · minor — check everything you take with our drug–supplement interaction checker.

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This information is for education, not a substitute for professional medical advice. Do not start, stop, or change any medication without talking to your pharmacist or prescriber.