Sorafenib and Buprenorphine: 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
Sorafenib
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 sorafenib (a cancer medicine) can each affect the timing of your heartbeat. Doctors call this QT prolongation. When two medicines that both do this are taken together, the effect can add up and, in rare cases, lead to an irregular heartbeat.
The good news is that this concern is theoretical for this specific pair, meaning it is based on how the drugs work rather than proven cases. Please don't stop either medicine on your own. Let your care team know you take both, especially if you have heart issues or low potassium or magnesium. They can watch your heart and adjust things safely.
Effect: Additive QT interval prolongation from concurrent buprenorphine and sorafenib. Both agents carry independent QT-prolonging potential; combined use is a pharmacodynamic (additive) interaction, not a metabolic one. Neither is a prodrug relevant here.
- Direction: Increased risk of QTc prolongation / torsades de pointes.
- Evidence: Theoretical; combined risk not quantified.
- Onset: Unspecified.
- Management: Manufacturer advises avoiding concomitant use. If co-prescribed, correct electrolytes (K+, Mg2+), obtain baseline and follow-up ECGs, and weigh risk factors (bradycardia, CHF, baseline QT prolongation, congenital long-QT, digitalis therapy, recent AF cardioversion).
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
The simultaneous administration of buprenorphine alongside agents capable of prolonging the QT interval should be avoided 342. It remains unknown what risk arises from pairing buprenorphine with other medications that prolong QT. When prescribing buprenorphine to patients presenting with risk factors, including hypokalemia, bradycardia, recent conversion from atrial fibrillation, congestive heart failure, digitalis treatment, baseline QT prolongation, subclinical long-QT syndrome, or severe hypomagnesemia, clinicians should take these considerations into account in their decisions 1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Your care team can manage this safely. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Make sure both your prescribers know you take buprenorphine and sorafenib together.
- Your team may check an ECG and your potassium and magnesium levels, and monitor you more closely.
- Tell them if you have heart failure, a slow or irregular heartbeat, a history of long-QT, or take digoxin.
- Report symptoms like fainting, dizziness, or a pounding or irregular heartbeat right away.
In some cases they may choose an alternative medicine, but that decision is theirs to make with you.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sorafenib and Buprenorphine together?
Both drugs can add to the effect on your heart's rhythm (QT prolongation), so tell your care team you take both; they may monitor your ECG and electrolytes or adjust your treatment. Do not stop either medicine on your own. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sorafenib and Buprenorphine 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 Sorafenib and Buprenorphine interaction managed?
Your care team can manage this safely. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Make sure both your prescribers know you take buprenorphine and sorafenib together. Your team may check an ECG and your potassium and magnesium levels, and monitor you more closely. Tell them if you have heart failure, a slow or irregular heartbeat, a history of long-… 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 Sorafenib or Buprenorphine 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 Sorafenib
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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