Buprenorphine and Amisulpride: 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
Amisulpride
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 amisulpride (used to prevent nausea and vomiting) can each stretch out a part of your heartbeat called the QT interval. When two medicines that do this are taken together, the effect can add up and, in rare cases, trigger a dangerous irregular heartbeat.
The good news is that this is a known, manageable concern. Your care team may check a heart tracing (an ECG) and watch you closely if you need both. Please don't stop or change either medicine on your own, just talk with your doctor or pharmacist so they can make the safest plan for you.
Effect: Additive QT-interval prolongation, increasing the theoretical risk of ventricular arrhythmias including torsades de pointes.
Mechanism: Pharmacodynamic additivity. Amisulpride causes dose- and concentration-dependent QT prolongation; buprenorphine also carries QT-prolonging potential. Neither is a prodrug relevant here; this is a PD, not PK, interaction.
- Direction: Additive/increased QT effect
- Evidence: Theoretical
- Severity: Major
- Management: Avoid concomitant use where possible. If unavoidable, obtain baseline and follow-up ECGs, correct electrolytes (K+, Mg2+), and review other QT-prolonging agents and risk factors.
What happens
Increased risk of serious ventricular arrhythmias such as torsades de pointes
Interaction Deep Dive
The prolongation of the QT interval linked to amisulpride is dependent on both dose and concentration. Co-administering amisulpride alongside other QT-prolonging agents should be avoided. Should such combined use be required, monitoring via ECG is advised1.
Why it happens (mechanism)
Additive QT prolongation
How to manage this interaction
Because both drugs can affect your heart's rhythm, your care team will decide the safest approach.
- They may avoid using both together when another option is available.
- If both are truly needed, they may order an ECG (heart tracing) to monitor your heart rhythm.
- They may check and correct electrolytes like potassium and magnesium, and review your other medicines.
Keep taking both exactly as prescribed unless your provider tells you otherwise. Tell your pharmacist or doctor if you feel fainting, dizziness, palpitations, or a racing/irregular heartbeat. Your team can tailor and monitor this safely.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Amisulpride together?
Combining buprenorphine and amisulpride can add up their effects on heart rhythm (QT prolongation), so this pairing is best avoided; if both are needed, expect ECG monitoring. Don't change either medicine yourself, ask your doctor or pharmacist. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Amisulpride 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 Amisulpride interaction managed?
Because both drugs can affect your heart's rhythm, your care team will decide the safest approach. They may avoid using both together when another option is available. If both are truly needed, they may order an ECG (heart tracing) to monitor your heart rhythm. They may check and correct electrolytes like potassium and magnesium, and review your other medicines. Keep taking both exactly as prescri… 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 Amisulpride 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: BARHEMSYS(R) intravenous injection, amisulpride intravenous injection. Acacia Pharma Inc (per FDA), Indianapolis, IN, 2020. DailyMed
Keep reading about Buprenorphine
Keep reading about Amisulpride
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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