Oliceridine and Amitriptyline: 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
Oliceridine
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 oliceridine (Olinvyk) can add up in two ways. First, both can raise serotonin, a brain chemical. Too much can cause serotonin syndrome, with symptoms like agitation, a racing heart, sweating, shaking, or fever. Second, amitriptyline has drying (anticholinergic) effects, and oliceridine is an opioid that slows the gut, so together they can cause trouble urinating and severe constipation that could lead to a blocked bowel.
The good news is your care team knows how to manage this. They can watch you closely, especially when starting or adjusting doses. Keep taking both as prescribed and let them know about any worrying symptoms.
Effect: Additive serotonergic activity increases serotonin syndrome risk; additive anticholinergic/opioid effects on GI and bladder increase risk of urinary retention, severe constipation, and paralytic ileus.
- Direction: Additive pharmacodynamic (PD) interaction, not PK; both agents contribute.
- Evidence: Theoretical.
- Onset: Unspecified; highest concern at initiation and dose titration.
- Management: If co-use is warranted, monitor closely for neuromuscular, autonomic, and mental-status changes; discontinue oliceridine if serotonin syndrome is suspected. Monitor for urinary retention and reduced gastric motility. Doses may need to be individualized by the care team.
What happens
Increased risk of serotonin syndrome and an increased risk of paralytic ileus
Interaction Deep Dive
Taking oliceridine together with serotonergic agents can lead to serotonin syndrome. When such combined use is necessary, monitor the patient closely, particularly when starting therapy and when adjusting the dose. If serotonin syndrome is suspected, oliceridine should be stopped. Furthermore, using oliceridine alongside anticholinergics can heighten the risk of urinary retention and/or severe constipation, potentially progressing to paralytic ileus. When oliceridine is given with anticholinergic drugs, watch patients for indications of urinary retention or diminished gastric motility1.
Why it happens (mechanism)
Additive serotonergic effects; unknown
How to manage this interaction
This combination is sometimes used intentionally, and your care team can manage it safely.
- Keep taking both exactly as prescribed unless your prescriber tells you otherwise.
- Expect closer monitoring, especially when either drug is started or the dose is changed. Doses may need to be adjusted and individualized by your team.
- Watch for serotonin syndrome: agitation, confusion, rapid heartbeat, sweating, shivering, muscle twitching, or fever. Get help right away if these appear.
- Also report trouble urinating, severe constipation, or belly pain and bloating.
Bring up any new symptoms with your pharmacist or prescriber promptly.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) During the post marketing period, instances of serotonin syndrome, a condition that may be life-threatening, have been documented when opioids were used together with serotonergic drugs 1.
Common questions
Can I take Oliceridine and Amitriptyline together?
Taking amitriptyline with oliceridine can add up to raise the risk of serotonin syndrome and of severe constipation or urinary retention, so stay alert for symptoms and let your care team monitor you, especially when starting or adjusting either drug. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Oliceridine and Amitriptyline 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 Oliceridine and Amitriptyline interaction managed?
This combination is sometimes used intentionally, and your care team can manage it safely. Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Expect closer monitoring, especially when either drug is started or the dose is changed. Doses may need to be adjusted and individualized by your team. Watch for serotonin syndrome: agitation, confusion, rapid heartbeat, sweat… 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 Oliceridine or Amitriptyline 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: OLINVYK(R) intravenous injection, oliceridine intravenous injection. Trevena Inc (per FDA), Chesterbrook, PA, 2023. DailyMed
Keep reading about Amitriptyline
Keep reading about Oliceridine
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