Vilazodone 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
Vilazodone
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 opioid-dependence medicine) and vilazodone (an antidepressant, brand Viibryd) can raise serotonin, a natural brain chemical. Taken together, they can push serotonin a bit too high. In rare cases this leads to something called serotonin syndrome.
Signs to watch for include feeling agitated or restless, a fast heartbeat, sweating, shivering, muscle twitching or stiffness, and shaking. This is mostly a theoretical concern, meaning it doesn't happen often, but it's worth knowing. Your care team can safely manage this, often by watching you a little more closely, especially when you first start or change a dose. If you feel these symptoms, reach out to your doctor or pharmacist right away.
Effect: Additive serotonergic activity from buprenorphine and vilazodone (an SSRI/5-HT1A partial agonist) may increase the risk of serotonin syndrome. This is a pharmacodynamic (additive) interaction, not a PK/enzyme effect; neither drug is a prodrug here.
- Direction: Increased serotonergic tone.
- Severity: Major. Evidence: Theoretical. Onset: Unspecified.
- Management: Use with caution. If combined, monitor for serotonin syndrome (autonomic instability, neuromuscular hyperactivity, altered mental status), especially at initiation and dose changes.
- Discontinue buprenorphine if serotonin syndrome is suspected.
What happens
An increased risk of serotonin syndrome
Interaction Deep Dive
Because of the risk of serotonin syndrome, use buprenorphine cautiously alongside other drugs that act on the serotonergic neurotransmitter system. Should combined use be necessary, watch for signs of serotonin syndrome, especially when starting therapy and when doses are changed21. If serotonin syndrome is suspected, stop buprenorphine1.
Why it happens (mechanism)
Additive serotonergic effects
How to manage this interaction
Keep taking both medicines as prescribed unless your doctor tells you otherwise. Many people use these together safely with appropriate monitoring.
- Your care team may monitor you more closely, especially when you first start either drug or change a dose.
- Watch for warning signs: agitation, confusion, fast heartbeat, sweating, shivering, muscle twitching or stiffness, and tremor.
- If these symptoms appear, contact your prescriber or pharmacist promptly; your doctor may stop the buprenorphine if serotonin syndrome is suspected.
- Tell any new provider you take both, and ask your pharmacist before adding other serotonergic drugs.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Vilazodone and Buprenorphine together?
Combining buprenorphine and vilazodone can add up to raise serotonin and, rarely, cause serotonin syndrome. Keep taking both as prescribed, watch for symptoms like agitation, fast heartbeat, sweating, and muscle twitching, and contact your care team if they occur. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Vilazodone 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 Vilazodone and Buprenorphine interaction managed?
Keep taking both medicines as prescribed unless your doctor tells you otherwise. Many people use these together safely with appropriate monitoring. Your care team may monitor you more closely, especially when you first start either drug or change a dose. Watch for warning signs: agitation, confusion, fast heartbeat, sweating, shivering, muscle twitching or stiffness, and tremor. If these symptoms… 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 Vilazodone 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 (2)
- Product Information: BRIXADI(TM) subcutaneous extended-release injection, buprenorphine subcutaneous extended-release injection. Braeburn Inc (per FDA), Plymouth Meeting, PA, 2023. DailyMed
- Product Information: PROBUPHINE(R) subdermal implant, buprenorphine subdermal implant. Braeburn Pharmaceuticals Inc (per FDA), Princeton, NJ, 2016.
Keep reading about Buprenorphine
Keep reading about Vilazodone
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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