Buprenorphine and Propafenone: 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
Propafenone
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 buprenorphine (a pain and addiction medicine) and propafenone (a heart rhythm medicine) can, on their own, gently affect your heart's electrical timing, something called the QT interval. When they are taken together, that effect can add up and, in theory, raise the chance of an abnormal heartbeat.
I want to be clear: this concern is based on how each drug works, not on lots of real-world reports of problems. The good news is your care team can manage this. They may check an EKG, watch your potassium and magnesium levels, and tailor your plan. Please keep taking both as prescribed and talk with your pharmacist or doctor before changing anything.
Effect: Additive risk of QT interval prolongation (PD interaction, not PK).
- Mechanism: Both agents can prolong QT; combined effect may be additive. Neither is a prodrug relevant here.
- Direction/magnitude: Increased cumulative QT effect; magnitude of combined risk is not established.
- Onset: Unspecified.
- Evidence: Theoretical.
- Management: Avoid concomitant use where feasible. If co-prescribed, assess and correct hypokalemia/hypomagnesemia, obtain baseline and follow-up ECG, and use caution with additional risk factors (bradycardia, CHF, digitalis, recent AF conversion, congenital long-QT). Dose may be individualized and patient monitored more closely.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Steer clear of using buprenorphine together with agents that can lengthen the QT interval 342. It remains unknown what risk arises from pairing buprenorphine with other drugs that prolong QT. When prescribing buprenorphine to patients who have risk factors, including hypokalemia, bradycardia, recent conversion from atrial fibrillation, congestive heart failure, digitalis therapy, baseline QT prolongation, subclinical long-QT syndrome, or severe hypomagnesemia, factor these considerations into clinical decision-making 1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Your care team can manage this by tailoring your treatment and watching your heart more closely.
- They may order an EKG before and during treatment to check your QT interval.
- They may check and correct potassium and magnesium levels.
- They will consider other risk factors such as a slow heart rate, heart failure, or other QT-affecting medicines.
- In some cases they may choose an alternative medicine to avoid using both together.
What you should do: Keep taking both exactly as prescribed and do not stop on your own. Tell your pharmacist or doctor if you feel fainting, dizziness, or a fluttering or pounding heartbeat.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Propafenone together?
Combining buprenorphine and propafenone can add to their effect on your heart's QT interval, so your care team may run an EKG, check your electrolytes, and possibly choose an alternative. Keep taking both as prescribed and report any dizziness, fainting, or palpitations. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Propafenone 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 Propafenone interaction managed?
Your care team can manage this by tailoring your treatment and watching your heart more closely. They may order an EKG before and during treatment to check your QT interval. They may check and correct potassium and magnesium levels. They will consider other risk factors such as a slow heart rate, heart failure, or other QT-affecting medicines. In some cases they may choose an alternative medicine… 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 Buprenorphine or Propafenone 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 (4)
- Product Information: BRIXADI(TM) subcutaneous extended-release injection, buprenorphine subcutaneous extended-release injection. Braeburn Inc (per FDA), Plymouth Meeting, PA, 2023. DailyMed
- Product Information: BUTRANS(R) transdermal system patch, buprenorphine transdermal system patch. Purdue Pharma L.P. (per FDA), Stamford, CT, 2016. DailyMed
- Product Information: BELBUCA(TM) buccal film, buprenorphine buccal film. Endo Pharmaceuticals Inc. (per FDA), Malvern, PA, 2016.
- Product Information: BUPRENEX(R) intravenous injection, intramuscular injection, buprenorphine HCl intravenous injection, intramuscular injection. Indivior Inc. (per DailyMed), Richmond, VA, 2016. DailyMed
Keep reading about Buprenorphine
Keep reading about Propafenone
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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