Lemborexant 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
Lemborexant
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 of these medicines can make you sleepy, so taking them together can add up. Amitriptyline (Elavil) is a tricyclic antidepressant that often causes drowsiness, and lemborexant (Dayvigo) is a sleep medicine. Together they can leave you feeling groggy or unsteady, and that grogginess may carry into the next day.
This matters most for driving, using machinery, or anything that needs a clear head. Older adults especially may be at higher risk of falls. The good news is your care team can manage this by adjusting your doses and watching how you feel. Please don't stop or change either one on your own, just talk with your doctor or pharmacist.
Mechanism: additive CNS depression between lemborexant (a dual orexin receptor antagonist) and amitriptyline (a sedating TCA). Neither is a prodrug here; this is a pharmacodynamic, not pharmacokinetic, interaction.
Effect/direction: increased CNS depression and next-day somnolence; lemborexant sedation can persist for several days after discontinuation.
- Evidence: theoretical
- Onset: unspecified
- Management: dose adjustment of lemborexant and/or the TCA may be needed; avoid combining lemborexant with other insomnia agents; counsel on next-day impairment, driving caution, and fall risk (especially elderly). Higher doses and short sleep windows amplify risk.
What happens
An increased risk of CNS depression and potential next-day somnolence
Interaction Deep Dive
Taking lemborexant together with a CNS depressant, for example tricyclic antidepressants (TCA's), raises the likelihood of CNS depression and the resulting daytime impairment. As a CNS depressant itself, lemborexant can compromise daytime wakefulness, and in certain patients this effect may last for up to several days following discontinuation of the drug. Owing to the possibility of additive effects when the two are given concurrently, the doses of both lemborexant and the accompanying TCA's may require adjustment. Combining lemborexant with other insomnia medications is also not advised. Some subjects receiving lemborexant 10 mg showed impaired driving ability. The chance of daytime impairment rises when lemborexant is taken with less than a full night of sleep available or when a dose above the recommended amount is used. Caution should be exercised regarding driving and any other tasks demanding full mental alertness. Patients should be counseled about the possibility of next-day somnolence stemming from additive effects. Since lemborexant can produce drowsiness, patients, especially the elderly, face a heightened risk of falls1.
Why it happens (mechanism)
Additive CNS depression
How to manage this interaction
Keep taking both exactly as prescribed unless your care team tells you otherwise. Because both drugs are sedating, here is what teams typically do:
- The dose of lemborexant and/or amitriptyline may need to be adjusted and individualized by your care team.
- Take lemborexant only when you have a full night (7 to 8 hours) to sleep.
- Be cautious with driving or tasks needing full alertness until you know how you feel, especially the morning after.
- Report daytime grogginess, dizziness, or any falls, especially if you are older.
Raise any new or worsening drowsiness with your pharmacist or prescriber so they can fine-tune your plan.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Some individuals who took lemborexant 10 mg experienced diminished driving ability. Taking lemborexant when less than a full night of sleep remains, or at a dose exceeding the recommended amount, raises the likelihood of daytime impairment 1.
Common questions
Can I take Lemborexant and Amitriptyline together?
Taking amitriptyline and lemborexant together can add up to extra drowsiness and next-day grogginess, raising fall and driving risks. Keep taking both as prescribed and let your care team adjust doses and monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Lemborexant 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 Lemborexant and Amitriptyline interaction managed?
Keep taking both exactly as prescribed unless your care team tells you otherwise. Because both drugs are sedating, here is what teams typically do: The dose of lemborexant and/or amitriptyline may need to be adjusted and individualized by your care team. Take lemborexant only when you have a full night (7 to 8 hours) to sleep. Be cautious with driving or tasks needing full alertness until you know… 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 Lemborexant 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: DAYVIGO(R) oral tablets, lemborexant oral tablets. Eisai Inc (per FDA), Nutley, NJ, 2025. DailyMed
Keep reading about Amitriptyline
Keep reading about Lemborexant
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