Acetaminophen And Codeine and Lemborexant: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jun 30, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Acetaminophen And Codeine
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 slow down your brain and body. The codeine in your pain pill is an opioid that causes drowsiness, and lemborexant (Dayvigo) is a sleep medicine that also makes you sleepy. Taking them together can add up, so you may feel more drowsy, dizzy, or foggy, and that sleepiness can carry into the next day.
This matters most for driving, using machines, or if you are older and could fall. The good news is your care team can manage this by adjusting your doses and watching how you respond. Please don't stop either medicine on your own. Talk with your pharmacist or doctor so they can tailor this safely for you.
Mechanism: additive CNS depression. Codeine (an opioid) plus acetaminophen combined with lemborexant, a dual orexin receptor antagonist, produces overlapping sedative pharmacodynamics. Neither drug's effect here depends on prodrug activation; this is a PD, not PK, interaction.
Effect: increased CNS depression and next-day somnolence; lemborexant sedation may persist for several days after discontinuation.
- Severity: major; evidence: theoretical; onset: unspecified.
- Management: dose adjustment of lemborexant and/or the opioid may be needed. Counsel on next-day impairment, driving, and fall risk (especially elderly). Avoid higher-than-recommended lemborexant doses and taking it with less than a full night of sleep.
What happens
An increased risk of CNS depression and potential next-day somnolence
Interaction Deep Dive
When lemborexant is given together with other CNS depressants, the likelihood of CNS depression rises, potentially producing daytime impairment. As a CNS depressant itself, lemborexant can diminish daytime wakefulness, and in certain patients this effect may linger for several days following discontinuation of the drug. Because the effects may be additive when the two are combined, it may be necessary to modify the dose of lemborexant as well as that of the accompanying CNS depressants. Pairing lemborexant with other agents used for insomnia is also not advised. In some subjects receiving lemborexant 10 mg, driving performance was impaired. Taking lemborexant when fewer than a full night of sleep remains, or at a dose above what is recommended, heightens the risk of daytime impairment. Under such conditions, patients should be cautioned against driving and other tasks that demand full mental alertness. Patients should be informed that next-day somnolence can occur due to additive effects. Since lemborexant may induce drowsiness, patients, especially older adults, face a greater risk of falls1.
Why it happens (mechanism)
Additive CNS depression
How to manage this interaction
Keep taking both as prescribed unless your prescriber tells you otherwise. Because these medicines can add to each other's sedating effects, your care team may:
- Adjust and individualize the dose of one or both medicines.
- Monitor you more closely for daytime drowsiness or unsteadiness.
What you can do:
- Take lemborexant only when you have a full night (at least 7 hours) to sleep.
- Use caution with driving or anything needing full alertness, especially the next day.
- If you are older, be extra careful about falls.
- Tell your pharmacist or doctor if you feel unusually sleepy, dizzy, or hard to wake.
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 showed impaired ability to drive. The likelihood of daytime impairment rises when lemborexant is taken with less than a complete night of sleep remaining or when a dose higher than recommended is used 1
Common questions
Can I take Acetaminophen And Codeine and Lemborexant together?
Combining acetaminophen with codeine and lemborexant can stack up drowsiness and cause next-day sleepiness, so use caution with driving and falls and let your care team adjust and monitor your doses. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Acetaminophen And Codeine and Lemborexant 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 Acetaminophen And Codeine and Lemborexant interaction managed?
Keep taking both as prescribed unless your prescriber tells you otherwise. Because these medicines can add to each other's sedating effects, your care team may: Adjust and individualize the dose of one or both medicines. Monitor you more closely for daytime drowsiness or unsteadiness. What you can do: Take lemborexant only when you have a full night (at least 7 hours) to sleep. Use caution with dr… 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.
Questions for your pharmacist
- Does my dose of Acetaminophen And Codeine or Lemborexant 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 Acetaminophen And Codeine
Keep reading about Lemborexant
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