Dayvigo Side Effects

Generic name: lemborexant

Medically reviewed by Philip Thornton, DipPharm. Last updated on Feb 16, 2024.

Note: This document contains side effect information about lemborexant. Some dosage forms listed on this page may not apply to the brand name Dayvigo.

Applies to lemborexant: oral tablet.

Serious side effects of Dayvigo

Along with its needed effects, lemborexant (the active ingredient contained in Dayvigo) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking lemborexant:

More common

• Sleepiness or unusual drowsiness
• unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
• unusual tiredness or weakness

Less common

• Temporary inability to move or talk while you are going to sleep or waking up

Rare

• Changes in behavior
• discouragement
• feeling sad or empty
• irritability
• lack of appetite
• loss of interest or pleasure
• seeing, hearing, or feeling things that are not there
• thoughts of killing oneself
• trouble concentrating

Other side effects of Dayvigo

Some side effects of lemborexant may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

• Headache

For Healthcare Professionals

Applies to lemborexant: oral tablet.

General

The most commonly reported side effects included somnolence, fatigue, headache, abnormal dreams and/or nightmares.^[Ref]

Nervous system

Very common (10% or more): Somnolence (up to 10.5%)

Common (1% to 10%): Headache, sleep paralysis

Frequency not reported: Cataplexy-like symptoms, lethargy^[Ref]

Psychiatric

Common (1% to 10%): Abnormal dreams, nightmare

Frequency not reported: Complex sleep behavior, hypnagogic hallucinations, suicidal ideation, worsening of depression^[Ref]

Other

Common (1% to 10%): Fatigue

Frequency not reported: Sluggishness^[Ref]

Frequently asked questions

• Is Dayvigo addictive?

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

Medical Disclaimer