Buprenorphine and Sunitinib: 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
Sunitinib
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 sunitinib (a cancer medicine) can each affect your heart's electrical rhythm in a way doctors call QT prolongation. When two medicines that do this are taken together, the effect can add up and, in rare cases, lead to an abnormal heartbeat.
This concern is based on theory and how these drugs work, not on lots of real-world reports. The good news is your care team can manage this easily. They may check your heart with an EKG and keep an eye on your blood minerals like potassium and magnesium. Keep taking both as prescribed, and talk with your pharmacist or doctor if you feel dizzy, faint, or notice a fluttering heartbeat.
Effect: Additive QT interval prolongation from concurrent buprenorphine and sunitinib. Both agents carry independent QT-prolonging potential; neither is a prodrug relevant to this interaction, so the concern is pharmacodynamic, not metabolic.
- Direction/mechanism: Additive PD effect on cardiac repolarization (increased risk of QTc prolongation, torsades de pointes).
- Evidence: Theoretical; combined risk not well quantified.
- Onset: Unspecified.
- Management: Manufacturer labeling advises avoiding concomitant use when feasible. If co-prescribed, obtain baseline and follow-up ECGs, correct/monitor electrolytes (K+, Mg2+), and assess additional risk factors (bradycardia, CHF, congenital long-QT, digoxin, recent cardioversion).
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
The simultaneous administration of buprenorphine together with agents capable of extending the QT interval should be avoided 342. It remains unknown what risk arises from pairing buprenorphine with additional QT-prolonging medications. When prescribing buprenorphine to individuals who carry 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, these considerations should factor into clinical decision-making 1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Both medicines can lengthen the QT interval, so your care team will weigh whether you need both and, if so, watch you more closely.
- Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Your team may check an EKG and monitor blood potassium and magnesium levels.
- Tell your prescriber about heart rhythm problems, slow heartbeat, heart failure, or other QT-affecting drugs you take.
- Get urgent help for fainting, palpitations, or severe dizziness.
Ask your pharmacist or doctor before starting or stopping anything so they can tailor and monitor your therapy.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Sunitinib together?
Combining buprenorphine and sunitinib can add up to lengthen the heart's QT interval, so your care team may avoid the combination or monitor your EKG and electrolytes closely; report fainting or palpitations right away. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Sunitinib 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 Sunitinib interaction managed?
Both medicines can lengthen the QT interval, so your care team will weigh whether you need both and, if so, watch you more closely. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your team may check an EKG and monitor blood potassium and magnesium levels. Tell your prescriber about heart rhythm problems, slow heartbeat, heart failure, or other QT-affec… 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 Sunitinib 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 Sunitinib
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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