Buprenorphine and Nortriptyline: 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
Nortriptyline
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-dependence medicine) along with nortriptyline (an older tricyclic antidepressant). Both of these can raise serotonin, a chemical messenger in your body, so taking them together may slightly raise the chance of a reaction called serotonin syndrome. Warning signs include agitation, a fast heartbeat, sweating, shivering, muscle twitching, or confusion.
Both drugs can also slow down your gut, so watch for severe constipation, which in rare cases can cause a serious bowel blockage. The good news is this is a theoretical concern, and your care team can manage it by watching you closely, especially when you first start or change a dose. Keep taking both as prescribed and call your provider if anything feels off.
Effect: Additive serotonergic activity raises the theoretical risk of serotonin syndrome; additive effects on GI motility (buprenorphine opioid effect plus nortriptyline anticholinergic effect) increase risk of severe constipation and paralytic ileus, plus possible urinary retention.
Direction/mechanism: Pharmacodynamic, additive; not a CYP-mediated PK interaction. Neither agent is a prodrug in a way that alters direction here.
Evidence: Theoretical. Severity: major. Onset: unspecified.
- Monitor for serotonergic toxicity (autonomic instability, neuromuscular excitability, mental status change), especially at initiation and dose changes.
- Monitor bowel/bladder function; counsel on constipation.
- Discontinue and treat if serotonin syndrome is suspected.
What happens
An increased risk of serotonin syndrome and an increased risk of paralytic ileus
Interaction Deep Dive
When buprenorphine is given together with serotonergic drugs, such as SSRIs, serotonin and norepinephrine reuptake inhibitors, tricyclic antidepressants, triptans, 5-HT3 receptor antagonists, agents that interfere with serotonin metabolism, and other medications acting on the serotonergic system, serotonin syndrome can develop. Watch for indications of severe constipation, since this may progress to paralytic ileus. Should combined use of buprenorphine with serotonergic agents that have anticholinergic effects be required, monitor the patient, particularly when starting therapy and when adjusting the dose231.
Why it happens (mechanism)
Additive serotonergic effects; additive effects on gastric motility
How to manage this interaction
Your care team can safely manage this combination. Typically they will:
- Watch you more closely, especially when you first start either drug or when a dose is changed.
- Check in about symptoms of serotonin syndrome (restlessness, rapid heartbeat, sweating, tremor, confusion).
- Ask about bowel and bladder habits to catch severe constipation or trouble urinating early.
What you should do: Keep taking both exactly as prescribed unless told otherwise. Drink fluids and stay active to help your gut. Contact your pharmacist or prescriber right away if you notice the symptoms above or persistent constipation, and seek urgent care for severe symptoms.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Nortriptyline together?
Taking buprenorphine with nortriptyline may add up to a small, mostly theoretical risk of serotonin syndrome and serious constipation, so keep taking both as prescribed but watch for symptoms and stay in close contact with your care team, especially when starting or adjusting doses. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Nortriptyline 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 Nortriptyline interaction managed?
Your care team can safely manage this combination. Typically they will: Watch you more closely, especially when you first start either drug or when a dose is changed. Check in about symptoms of serotonin syndrome (restlessness, rapid heartbeat, sweating, tremor, confusion). Ask about bowel and bladder habits to catch severe constipation or trouble urinating early. What you should do: Keep taking b… 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 Buprenorphine or Nortriptyline 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 (3)
- 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: SUBOXONE(R) sublingual film, buprenorphine naloxone sublingual film. Indivior Inc (per FDA), Richmond, VA, 2017. DailyMed
Keep reading about Buprenorphine
Keep reading about Nortriptyline
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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