Vemurafenib 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
Vemurafenib
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 vemurafenib (a cancer medicine) can each affect the timing of your heartbeat, something doctors call the QT interval. When two medicines that do this are taken together, the effect can add up, which in rare cases could lead to an irregular heartbeat.
The good news is that this is a known, manageable concern. Your care team may check your heart rhythm with an EKG, keep an eye on blood minerals like potassium and magnesium, and tailor your plan to you. Please don't stop or change either medicine on your own and talk with your pharmacist or doctor about it.
Effect: Additive QT-interval prolongation when buprenorphine is combined with vemurafenib. Both agents are independently associated with QTc prolongation; neither is a prodrug relevant here, so the concern is pharmacodynamic summation, not a metabolic shift.
- Severity: Major; evidence: theoretical (additive risk not quantified).
- Onset: unspecified.
- Management: Avoid concomitant use where possible. If co-administered, obtain baseline and follow-up ECGs, correct and monitor potassium and magnesium, and review other QT-prolonging drugs and bradycardia.
- Higher-risk patients: hypokalemia, hypomagnesemia, bradycardia, CHF, baseline/congenital long QT, recent cardioversion, digitalis therapy.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
The simultaneous administration of buprenorphine alongside medications capable of extending the QT interval should be avoided 342. It remains unknown what risk arises from pairing buprenorphine with other agents that prolong QT. When prescribing buprenorphine to patients who present with 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, clinicians should weigh these considerations in their decisions 1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Both medicines can lengthen the QT interval, so a care team pays close attention when they are used together.
- Keep taking both as prescribed unless your doctor tells you otherwise.
- Your team may order an EKG before and during treatment and check blood potassium and magnesium levels.
- They will review your other medicines for anything else that affects heart rhythm.
- Tell your team if you have fainting, dizziness, or a fast or fluttering heartbeat.
Because avoiding the combination is preferred, ask your pharmacist or prescriber whether an alternative is appropriate for you. Your plan can be individualized and monitored closely.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Vemurafenib and Buprenorphine together?
Buprenorphine and vemurafenib can each prolong the QT interval, so combining them may add up and raise the risk of an irregular heartbeat; avoid the combination if possible, and if used together your care team should monitor your EKG and blood minerals. Talk with your pharmacist or doctor before making any changes. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Vemurafenib 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 Vemurafenib and Buprenorphine interaction managed?
Both medicines can lengthen the QT interval, so a care team pays close attention when they are used together. Keep taking both as prescribed unless your doctor tells you otherwise. Your team may order an EKG before and during treatment and check blood potassium and magnesium levels. They will review your other medicines for anything else that affects heart rhythm. Tell your team if you have fainti… 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 Vemurafenib 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 Vemurafenib
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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