Levomilnacipran 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
Levomilnacipran
No brand names on record
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.
You've been prescribed buprenorphine (a pain or opioid-treatment medicine) along with levomilnacipran (an antidepressant). Both can raise levels of a brain chemical called serotonin. When two medicines do this at the same time, there's a small chance of too much serotonin, which is called serotonin syndrome.
Warning signs include feeling agitated or restless, shaking, sweating, a fast heartbeat, muscle twitching, or a high fever. This is mostly a theoretical concern, meaning it doesn't happen often, but it's worth knowing. The good news: your care team can manage this safely by watching how you feel, especially when you first start or change a dose. Keep taking both as prescribed and call your pharmacist or doctor with any of those symptoms.
Effect: Additive serotonergic activity increases the theoretical risk of serotonin syndrome. Buprenorphine has modest serotonergic potential; levomilnacipran is an SNRI (potent serotonin/norepinephrine reuptake inhibitor). This is a pharmacodynamic interaction, not PK; neither agent's metabolism drives it.
- Direction: Additive serotonergic effect (increased effect).
- Severity/Evidence: Major severity, but substantiation is theoretical.
- Onset: Unspecified; risk highest at initiation and dose titration.
- Management: Use with caution. Monitor for clonus, hyperreflexia, autonomic instability, hyperthermia, agitation, and neuromuscular signs. Discontinue buprenorphine if serotonin syndrome is suspected. Doses may need to be individualized by the care team.
What happens
An increased risk of serotonin syndrome
Interaction Deep Dive
Because of the risk of serotonin syndrome, use buprenorphine cautiously when it is combined with other drugs that act on the serotonergic neurotransmitter system. When such combined use cannot be avoided, 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
If both medicines are prescribed together, that can be appropriate. Here's how your care team typically manages it:
- Closer monitoring for signs of serotonin syndrome, especially when either medicine is started or the dose is adjusted.
- Individualized dosing tailored by your prescriber.
- Stopping buprenorphine if serotonin syndrome is suspected, done under medical guidance.
What you can do: keep taking both exactly as prescribed, and don't stop on your own. Contact your pharmacist or doctor promptly if you notice agitation, shivering, sweating, rapid heartbeat, muscle twitching or stiffness, or fever. Ask your pharmacist to review your full medication list for other serotonergic drugs.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Levomilnacipran and Buprenorphine together?
Combining buprenorphine and levomilnacipran carries a theoretical risk of serotonin syndrome from additive serotonergic effects. Keep taking both as prescribed, watch for symptoms like agitation, sweating, tremor, or fast heartbeat (especially early or after dose changes), and contact your care team if they appear. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Levomilnacipran 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 Levomilnacipran and Buprenorphine interaction managed?
If both medicines are prescribed together, that can be appropriate. Here's how your care team typically manages it: Closer monitoring for signs of serotonin syndrome, especially when either medicine is started or the dose is adjusted. Individualized dosing tailored by your prescriber. Stopping buprenorphine if serotonin syndrome is suspected, done under medical guidance. What you can do: keep taki… 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 Levomilnacipran 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 Levomilnacipran
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.
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist