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Lemborexant (Dayvigo)

A newer sleep medication that blocks the brain's wakefulness signal, approved for trouble falling and staying asleep.

Medically reviewed by Shariq Refai, MD, MBA Last reviewed: June 8, 2026

What it treats

Lemborexant is approved by the U.S. Food and Drug Administration for insomnia characterized by difficulties with sleep onset, sleep maintenance, or both, in adults.

It should not be used in narcolepsy. Because it acts on the orexin system, which is already dysfunctional in narcolepsy, the effect could worsen daytime sleepiness or cataplexy.

How it works

Lemborexant blocks orexin, a wake-promoting neuropeptide (also called hypocretin) that keeps a person alert. Rather than pushing on the brain's calming systems (GABA), lemborexant turns down the wakefulness side of the balance. That is a different approach to helping with sleep, and one reason lemborexant produces less of the "GABA hangover" feel of benzodiazepines or z-drugs.

It's one of a small newer group of orexin-blocking sleep drugs. Suvorexant (Belsomra) and daridorexant (Quviviq) work by the same mechanism, with differences in half-life and dosing.

Receptor mechanism (detail)

Lemborexant is a dual orexin receptor antagonist (blocks both OX1R and OX2R). It doesn't activate GABA-A receptors, which is why it doesn't produce the same class of memory, cognitive, and dependence effects as benzodiazepines. Half-life is around 17 to 19 hours. That long half-life is a strength for sleep maintenance across the night, but it's also why next-day sedation can occur, particularly at the higher 10 mg dose.

Potency and typical dosing pattern

Ranges are typical framework only, not a prescription for any individual.

5 mg or 10 mg at bedtime, taken within 30 minutes of intended sleep, with at least 7 hours remaining before wake time. Start with 5 mg; increase to 10 mg if needed.

Safety monitoring

  • Next-day sedation. More pronounced at 10 mg. Assess for impaired driving or reduced work performance.
  • Sleep paralysis and hypnagogic hallucinations, occasional.
  • Complex sleep behaviors (sleepwalking, sleep-eating, sleep-driving), reported with all orexin antagonists.
  • Depression and suicidality. New or worsening mood changes warrant prescriber contact.
  • Schedule IV controlled substance. Misuse potential exists but is lower than benzodiazepines or z-drugs.
  • Not for use in narcolepsy.

What to expect

The first few doses

Falling asleep and staying asleep both usually improve within the first several nights. Next-day feel matters more than with shorter-acting sleep medications. Some people notice grogginess in the morning; others don't.

Common side effects

  • Next-day drowsiness.
  • Headache.
  • Nightmares or abnormal dreams.
  • Sleep paralysis (brief inability to move on falling asleep or waking up).
  • Fatigue.

If a side effect is bothersome or persistent, that's a conversation for the prescriber.

Serious side effects and warnings

Lemborexant does not carry an FDA boxed warning. Several labeled warnings are worth knowing.

  • Next-day drowsiness and impaired driving. Particularly at the 10 mg dose. Don't drive or do skilled tasks in the morning if you feel groggy.
  • Complex sleep behaviors. Sleepwalking, sleep-driving, sleep-eating, all reported. Any of these means stop the medication and contact the prescriber.
  • Sleep paralysis and hypnagogic hallucinations. Brief and usually not dangerous, but disorienting.
  • Cataplexy-like symptoms. Brief leg weakness has been reported, occasional.
  • Worsening depression or suicidal thoughts warrant prescriber contact.

Sexual side effects

Lemborexant doesn't typically cause sexual side effects such as reduced libido or delayed orgasm. As with other sleep drugs, the relevant issue is complex sleep behaviors. Rarely, those can include activity done while not fully awake. Report anything of that kind.

Weight, appetite, and sleep

Lemborexant is generally weight-neutral. It doesn't tend to change appetite. It is taken at bedtime for sleep, so daytime effects are limited beyond the next-morning grogginess some people experience.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual. The right dose is a decision for a prescriber.

Lemborexant comes as tablets in 5 mg and 10 mg. Taken within 30 minutes of intended sleep, with at least 7 hours before waking.

Missed doses and interactions

Missed doses are simple: if the night is missed, just don't take it. Don't take it without a full night of sleep available.

Strong or moderate CYP3A4 inhibitors (ketoconazole, itraconazole, clarithromycin, diltiazem) can raise lemborexant levels and are either contraindicated or require dose adjustment. Strong CYP3A4 inducers (rifampin, some anticonvulsants) can reduce effectiveness.

Alcohol adds to sedation. Other CNS depressants (opioids, benzodiazepines) compound both sedation and complex sleep behavior risk. Give every prescriber and pharmacist the full medication list.

Stopping and tapering

Lemborexant doesn't require a formal taper. Rebound insomnia and withdrawal are much less of a concern than with benzodiazepines or z-drugs. Even so, a check-in with the prescriber makes sense when stopping, to review whether the underlying sleep problem needs a different approach.

Pregnancy and breastfeeding

Data on lemborexant use in pregnancy and breastfeeding are limited. Individual circumstances matter, and the decision belongs with a clinician. Anyone pregnant, planning a pregnancy, or breastfeeding should talk it through with their prescriber.

Cost and generic availability

Lemborexant is a newer, branded medication and is not yet available as a generic. Cost is significant compared with generic older sleep drugs. Insurance coverage varies. Manufacturer copay assistance may apply.

Common questions

How is lemborexant different from Ambien or Xanax? Ambien (zolpidem) and benzodiazepines work by ramping up GABA, the brain's calming system. Lemborexant blocks orexin, the wakefulness signal. The subjective feel is different, memory and cognitive effects are less prominent, and dependence risk is lower.

How is it different from suvorexant (Belsomra)? Both are dual orexin antagonists. Lemborexant has slightly stronger effects on sleep maintenance in trials and a different pharmacokinetic profile. Cost and insurance coverage often decide which one gets prescribed.

Is it addictive? Its misuse liability is lower than benzodiazepines or z-drugs, which is why it's Schedule IV. Some potential exists.

Will I feel groggy the next day? Some people do, especially at 10 mg. Taking it only when at least 7 hours of sleep are available reduces the risk.

Can I take it if I have narcolepsy? No. Lemborexant should not be used in narcolepsy.

Questions to ask your prescriber

  • Is lemborexant a good fit for the kind of insomnia I have?
  • Should I start at 5 mg or 10 mg?
  • How much sleep time do I need to allow after taking it?
  • Which of my other medications interact with it?
  • If we decide to stop it later, how would we do that?

Sources

This guide draws on current prescribing information and public health references and current as of June 8, 2026. It is reviewed for clinical accuracy and updated as guidance changes.

How Dayvigo compares

Side-by-side guides to Dayvigo and the medications it's most often weighed against.

Define this drug class in the network glossary Orexin receptor antagonist on Shrinktionary

THE KNOWLEDGE PATH

Walk this topic outward.

  1. MEDICATION Lemborexant (Dayvigo) (current)
  2. CLASS Sleep medications
  3. CONDITION Sleep (on Shrinkopedia)
  4. MAP The Sleep & Anxiety Map (on AR)
  5. CARE Sleep care at shrinkMD

The Knowledge Path is a curated walk. Every step is one decision away from the next.

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When to seek urgent help

Sleep medications can interact dangerously with alcohol, opioids, and other sedating medications, and a small number of people have unusual sleep behaviors.

  • Severe drowsiness, slowed breathing, or unresponsiveness, especially after combining with alcohol, opioids, or other sedatives.
  • Sleep behaviors you don't remember the next morning, such as driving, walking, eating, or making phone calls while not fully awake.
  • Severe allergic reactions, such as swelling of the face, lips, or tongue, or trouble breathing.

If you or someone else is in immediate danger, or thinking about suicide: in the U.S., call or text 988 for the Suicide and Crisis Lifeline, call 911, or go to the nearest emergency room. Outside the U.S., see findahelpline.com for a local crisis line.

Managing a medication needs a prescriber

Any psychiatric medication has to be started and adjusted by a clinician who can follow you over time. If you don't have a prescriber, our guides section explains the options, including in-person care and telepsychiatry, and how to choose between them.