Buprenorphine and Lacosamide: 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
Lacosamide
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 strong pain and opioid-dependence medicine) and lacosamide (a seizure medicine) can slow down your brain and nervous system. When you take them together, those calming effects can stack up. That may leave you feeling more sleepy, dizzy, foggy, or less steady on your feet, and in some cases your breathing can slow down.
This concern is based on how the drugs work rather than lots of real-world reports, but it is worth taking seriously. The good news is your care team can manage this by picking the right doses and keeping a closer eye on you. Let your doctor or pharmacist know if you feel unusually drowsy or confused.
Effect: Additive CNS depression when buprenorphine (partial mu-opioid agonist) is combined with lacosamide. Both agents are pharmacodynamic CNS depressants; no prodrug activation is involved, so effects are additive rather than metabolic.
- Direction: Increased sedation, dizziness, cognitive/neuropsychiatric effects, and potential respiratory depression.
- Onset: Unspecified; expect it around dosing/titration.
- Evidence: Theoretical (mechanism-based).
- Magnitude: Not quantified.
Management: Use lacosamide with extreme caution alongside opioids. Consider conservative dosing, individualized titration, and closer monitoring of sedation, respiratory status, and mental status. Counsel on additive somnolence and fall risk.
What happens
An increased risk of CNS depression
Interaction Deep Dive
Exercise extreme caution when lacosamide is given alongside CNS depressants, since this pairing carries the risk of CNS depression along with additional cognitive and/or neuropsychiatric adverse reactions1.
Why it happens (mechanism)
Additive CNS depression
How to manage this interaction
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This combination can be used safely with the right precautions.
- Your care team may adjust and individualize your doses and go slowly with any changes.
- They may monitor you more closely for drowsiness, dizziness, confusion, or slowed breathing, especially when either dose changes.
- Avoid alcohol and other sedating substances that add to this effect.
- Tell your pharmacist or doctor right away if you feel very sleepy, hard to wake, confused, or short of breath.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Lacosamide together?
Taking buprenorphine and lacosamide together can add up to more drowsiness, dizziness, and in serious cases slowed breathing, so use them cautiously and watch for these signs. Your care team can manage this by tailoring your doses and monitoring you more closely. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Lacosamide 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 Lacosamide interaction managed?
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This combination can be used safely with the right precautions. Your care team may adjust and individualize your doses and go slowly with any changes. They may monitor you more closely for drowsiness, dizziness, confusion, or slowed breathing, especially when either dose changes. Avoid alcohol and other sedating s… 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 Lacosamide 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 (1)
- Product Information: Motpoly XR oral extended-release capsules, lacosamide oral extended-release capsules. Aucta Pharmaceuticals, Inc, Piscataway, NJ, 2023. DailyMed
Keep reading about Buprenorphine
Keep reading about Lacosamide
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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