Amitriptyline and Remifentanil: 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
Remifentanil
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.
Amitriptyline (Elavil) and the surgical pain medicine remifentanil both raise levels of a brain chemical called serotonin. When two serotonin-boosting drugs are used together, there is a chance of a reaction called serotonin syndrome. Signs can include agitation, a fast heartbeat, sweating, shivering, muscle twitching, or feeling confused.
This warning is based mostly on theory and reports, not on proof that it happens often. Remifentanil is usually given in a hospital or surgery setting, so your care team can watch you closely and act quickly if anything looks off. Make sure they know you take amitriptyline.
Interaction: Additive serotonergic activity between amitriptyline (serotonin reuptake inhibition) and remifentanil, increasing the theoretical risk of serotonin syndrome.
- Direction/mechanism: Pharmacodynamic, additive serotonergic effect (not a metabolic/prodrug interaction).
- Onset: Typically several hours to a few days after starting or dose adjustment; may be later.
- Evidence: Theoretical, though serotonin syndrome has been reported with remifentanil plus serotonergic agents.
- Management: If remifentanil is required, monitor closely, especially at initiation and dose changes, for autonomic instability, neuromuscular abnormalities, and mental status changes. Discontinue remifentanil if serotonin syndrome is suspected.
What happens
Increased risk of serotonin syndrome
Interaction Deep Dive
Serotonin syndrome has been reported when remifentanil is administered together with serotonergic agents. When remifentanil cannot be avoided, monitor the patient closely, especially when starting therapy and when the dose is being changed. Symptoms typically appear within a few hours to several days after the drugs are combined, although they can also develop later. Stop remifentanil if serotonin syndrome is suspected1.
Why it happens (mechanism)
Additive serotonergic effects
How to manage this interaction
Remifentanil is generally given during procedures or in monitored hospital care, so your team can manage this safely.
- Tell your care team you take amitriptyline before any surgery or procedure.
- Keep taking both as prescribed unless your prescriber tells you otherwise.
- Expect closer monitoring when remifentanil is started or adjusted, watching for fast heart rate, sweating, shivering, muscle twitching, agitation, or confusion.
- Your team can stop remifentanil promptly if serotonin syndrome is suspected, and doses can be individualized to you.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Instances of serotonin syndrome have been documented when remifentanil is used together with serotonergic agents 1.
Common questions
Can I take Amitriptyline and Remifentanil together?
Combining amitriptyline with remifentanil can add up serotonin effects and raise the theoretical risk of serotonin syndrome; make sure your care team knows about your amitriptyline so they can monitor you closely. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Remifentanil 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 Remifentanil interaction managed?
Remifentanil is generally given during procedures or in monitored hospital care, so your team can manage this safely. Tell your care team you take amitriptyline before any surgery or procedure. Keep taking both as prescribed unless your prescriber tells you otherwise. Expect closer monitoring when remifentanil is started or adjusted, watching for fast heart rate, sweating, shivering, muscle twitch… 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 Remifentanil 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: ULTIVA(R) intravenous injection, remifentanil HCl intravenous injection. Mylan Institutional LLC (per FDA), Morgantown, WV, 2023. DailyMed
Keep reading about Amitriptyline
Keep reading about Remifentanil
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