Tasimelteon Side Effects

Medically reviewed by Drugs.com. Last updated on Nov 9, 2023.

Applies to tasimelteon: oral capsule, oral suspension.

Serious side effects of tasimelteon

Along with its needed effects, tasimelteon 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 tasimelteon:

More common side effects

• bladder, lower back, or side pain
• bloody or cloudy urine
• difficult, burning, frequent, or painful urination

Other side effects of tasimelteon

Some side effects of tasimelteon 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 side effects

• body aches or pain
• chills or fever
• cough
• ear congestion
• headache
• nightmares
• runny or stuffy nose
• sneezing

For healthcare professionals

Applies to tasimelteon: oral capsule, oral suspension.

Nervous system adverse events

• Very common (10% or more): Headache (17%)
• Frequency not reported: Somnolence^[Ref]

Hepatic

• Very common (10% or more): Increased ALT (10%)^[Ref]

Psychiatric

• Very common (10% or more): Nightmare/abnormal dreams (10%)

Genitourinary

• Common (1% to 10%): Urinary tract infection^[Ref]

Respiratory

• Common (1% to 10%): Upper respiratory tract infection^[Ref]

Further information

Tasimelteon side effects can vary depending on the individual. 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