Amitriptyline 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
Amitriptyline
Buprenorphine
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.
Taking amitriptyline (Elavil) together with buprenorphine can add up in a few ways. Both can affect your heart's rhythm (something called QT prolongation), both raise serotonin in your body, and both can slow down your gut. When their effects stack, there's a higher chance of an irregular heartbeat, a reaction called serotonin syndrome (things like agitation, sweating, shaking, or a racing heart), and severe constipation that can become serious.
This concern is based on how these drugs work rather than a lot of real-world reports, so try not to worry. Keep taking both exactly as prescribed, and let your pharmacist or doctor know you're on both so they can watch over you and keep you safe.
Additive toxicity risk when combining amitriptyline (a TCA) with buprenorphine.
- QT prolongation: both agents can prolong the QT interval; additive effect increases torsades risk.
- Serotonin syndrome: amitriptyline's serotonergic activity plus buprenorphine's may be additive.
- Paralytic ileus: anticholinergic (TCA) plus opioid effects on gut motility are additive.
Direction: pharmacodynamic, additive (not a CYP/prodrug issue). Onset: unspecified. Evidence: theoretical. Management: avoid if possible; if unavoidable, monitor closely during initiation and titration, consider ECG/electrolyte review, watch for serotonergic signs and severe constipation, and discontinue if serotonin syndrome is suspected.
What happens
An increased risk of QT interval prolongation, an increased risk of serotonin syndrome and an increased risk of paralytic ileus
Interaction Deep Dive
Buprenorphine should not be taken together with medications that may prolong the QT interval34. Furthermore, combining buprenorphine with other drugs acting on the serotonergic neurotransmitter system may raise the likelihood of serotonin syndrome. When such combined use cannot be avoided, monitor the patient, particularly when starting therapy and when adjusting the dose, and stop the drug if serotonin syndrome is suspected. Watch for indications of severe constipation, as this may lead to paralytic ileus21.
Why it happens (mechanism)
Additive QT interval prolongation; additive serotonergic effects; additive effects on gastric motility
How to manage this interaction
Your care team can manage this combination if it's needed.
- Keep taking both as prescribed unless your prescriber tells you otherwise. Do not stop either drug on your own.
- Your team may monitor you more closely, especially when starting or changing a dose, and doses may be adjusted and individualized for you.
- They may check your heart rhythm (ECG) given the QT concern.
- Call your doctor right away if you notice agitation, confusion, fast heartbeat, heavy sweating, shivering, or muscle twitching (possible serotonin syndrome).
- Watch for severe constipation or belly pain, which can signal a bowel that has stopped moving.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Buprenorphine together?
Combining amitriptyline and buprenorphine can add up to raise the risk of QT problems, serotonin syndrome, and severe constipation, so this pairing is often avoided. If you take both, keep taking them as prescribed and let your care team monitor you and adjust doses as needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline 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 Amitriptyline and Buprenorphine interaction managed?
Your care team can manage this combination if it's needed. Keep taking both as prescribed unless your prescriber tells you otherwise. Do not stop either drug on your own. Your team may monitor you more closely, especially when starting or changing a dose, and doses may be adjusted and individualized for you. They may check your heart rhythm (ECG) given the QT concern. Call your doctor right away i… 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Amitriptyline 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 (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 Amitriptyline
Keep reading about Buprenorphine
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