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Dayvigo Side Effects

Generic Name: lemborexant

Medically reviewed by Last updated on May 25, 2020.

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

For the Consumer

Applies to lemborexant: oral tablet


Take lemborexant right before you get into bed. Never take this medicine if you do not have 7 hours to sleep before being active again.

Your reactions may be impaired the morning after you take lemborexant. Do not drive or do anything that requires you to be alert. Drowsiness can cause falls, accidents, or severe injuries.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Some people using this medicine have engaged in activity while not fully awake and later had no memory of it. This may include walking, driving, eating, having sex, or making phone calls. If this happens to you, call your doctor right away.

Call your doctor at once if you have:

  • trouble moving or talking when you first wake up;

  • a weak feeling in your legs;

  • unusual thoughts or behavior;

  • anxiety, agitation, depression;

  • memory problems;

  • confusion, hallucinations; or

  • worsening depression or thoughts about hurting yourself.

Older adults have a higher risk of falls due to drowsiness caused by lemborexant (the active ingredient contained in Dayvigo)

Common side effects may include:

  • drowsiness during the day after taking lemborexant.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

For Healthcare Professionals

Applies to lemborexant: oral tablet


Common (1% to 10%): Sleep paralysis

Uncommon (0.1% to 1%): Hypnagogic hallucinations

Very rare (less than 0.01%): Complex sleep behaviors[Ref]


Very common (10% or more): Somnolence or fatigue (10%)

Common (1% to 10%): Nightmare or abnormal dreams[Ref]


Common (1% to 10%): Headache[Ref]


1. "Product Information. Dayvigo (lemborexant)." Eisai Inc, Woodcliff Lake, NJ.

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.