What Is Dayvigo? Uses, Dosage, and What You Need to Know in 2026

Dayvigo Is a Prescription Sleep Medication Used to Treat Insomnia in Adults

Dayvigo (Lemborexant) is a brand-name prescription medication used to treat insomnia — specifically difficulty falling asleep or staying asleep — in adults 18 years and older. It belongs to a newer class of sleep medications called dual orexin receptor antagonists (DORAs) and was approved by the FDA in December 2019.

If you've been prescribed Dayvigo or are considering asking your doctor about it, this guide covers everything you need to know: what it is, how it works, how to take it, who should avoid it, and how much it costs.

What Is Dayvigo?

Here are the key facts:

• Brand name: Dayvigo
• Generic name: Lemborexant
• Drug class: Dual orexin receptor antagonist (DORA)
• Manufacturer: Eisai Inc.
• FDA approval: December 2019
• Controlled substance: Schedule IV (CIV) — meaning it has potential for abuse and dependence, though lower than Schedule II or III drugs
• Available strengths: 5 mg and 10 mg oral tablets
• Generic available: No — Dayvigo is currently only available as a brand-name medication

Dayvigo works differently from older sleep medications like Benzodiazepines (Xanax, Valium) and Z-drugs (Ambien, Lunesta). Instead of sedating the brain broadly, it targets the orexin system — a specific set of brain chemicals that keep you awake. By blocking orexin receptors, Dayvigo helps quiet the wake signals in your brain so you can fall asleep and stay asleep. Learn more about how Dayvigo works.

What Is Dayvigo Used For?

Dayvigo is FDA-approved for the treatment of insomnia in adults, specifically:

• Difficulty falling asleep (sleep onset insomnia)
• Difficulty staying asleep (sleep maintenance insomnia)

It is not approved for use in children under 18. It is not a treatment for other sleep disorders like sleep apnea or narcolepsy. In fact, Dayvigo should not be taken by people with narcolepsy because it can worsen symptoms.

Dayvigo is intended for ongoing use as prescribed by your doctor. It's not a short-term "as needed" sleep aid — though your doctor will guide you on how long to take it based on your situation.

How Is Dayvigo Taken?

Taking Dayvigo correctly is important for both effectiveness and safety.

Dosage

• Starting dose: 5 mg once per night
• Maximum dose: 10 mg once per night (if 5 mg isn't sufficient and your doctor approves an increase)
• Liver impairment: Maximum dose is 5 mg for patients with moderate liver problems. Not recommended for severe liver impairment.

How to Take It

• Take one tablet once per night, right before going to bed.
• Only take Dayvigo when you can stay in bed for at least 7 hours before you need to be active.
• Do not take with or right after a meal. Eating before taking Dayvigo can delay how quickly it works.
• Swallow the tablet whole — do not crush, chew, or break it.
• Do not take more than one dose per night.

If You Miss a Dose

If you forget to take Dayvigo before bed, skip that dose unless you can still sleep for at least 7 hours. Do not take a double dose the next night.

Who Should Not Take Dayvigo?

Dayvigo is not right for everyone. Do not take it if you:

• Have narcolepsy. Dayvigo works by blocking wake-promoting signals, which can worsen narcolepsy symptoms.
• Are allergic to Lemborexant or any ingredients in Dayvigo.

Tell your doctor before starting Dayvigo if you have:

• A history of depression, mental illness, or suicidal thoughts
• A history of drug or alcohol abuse or addiction
• Liver problems
• Lung or breathing problems, including sleep apnea
• A history of cataplexy (sudden muscle weakness)
• Daytime sleepiness

Also tell your doctor about all medications you take, including over-the-counter drugs, vitamins, and supplements. Dayvigo has important drug interactions that can affect its safety and effectiveness.

If you're pregnant or breastfeeding, talk to your doctor. There isn't enough data to confirm Dayvigo's safety during pregnancy, and the medication does pass into breast milk.

What Are the Side Effects?

The most common side effect of Dayvigo is drowsiness or sleepiness the next morning. Other common side effects include fatigue, headache, dizziness, and unusual dreams.

Serious but rare side effects include complex sleep behaviors (sleepwalking, sleep-driving), worsening depression, suicidal thoughts, and temporary leg weakness.

For a complete guide, read our article on Dayvigo side effects.

How Much Does Dayvigo Cost?

Dayvigo is a brand-name medication with no generic alternative, which makes it expensive without help.

• Cash price: Approximately $300 to $400 for a 30-day supply (30 tablets)
• With a coupon (GoodRx, SingleCare): As low as $135 to $340 depending on the pharmacy and coupon
• With the Eisai Instant Savings Card: As little as $10 per month for commercially insured patients (up to 12 uses per year)
• Eisai Patient Assistance Program: Free medication for patients who meet income eligibility requirements

Most commercial insurance plans cover Dayvigo, but many require prior authorization or step therapy (trying a cheaper medication first). Check with your insurance company to understand your specific coverage.

For a complete guide to saving money, read how to save money on Dayvigo.

How Does Dayvigo Compare to Other Sleep Medications?

Dayvigo is one of two dual orexin receptor antagonists on the market. The other is Quviviq (Daridorexant), made by Idorsia. Both work by blocking orexin receptors, but they differ in their specific pharmacology, dosing, and cost.

Older sleep medications that Dayvigo is often compared to include:

• Ambien (Zolpidem): A Z-drug that's available as a generic and costs much less. It's effective for sleep onset but is better known for short-term use.
• Lunesta (Eszopiclone): Another Z-drug available as a generic. It helps with both falling and staying asleep.
• Belsomra (Suvorexant): The first DORA approved by the FDA (2014). Similar mechanism to Dayvigo but a different orexin receptor binding profile.

Your doctor can help you weigh the pros and cons of each option based on your symptoms, medical history, and budget. For more options, see our guide to alternatives to Dayvigo.

Final Thoughts

Dayvigo is a modern, effective option for adults with insomnia. Its targeted mechanism — blocking orexin wake signals rather than broadly sedating the brain — sets it apart from older sleep medications. But it's a brand-name drug with a high price tag, and it's not right for everyone.

If you think Dayvigo might be right for you, talk to your doctor. If you already have a prescription, use Medfinder to find it in stock near you and check our savings guides to keep costs manageable.