Note: This document contains side effect information about tasimelteon. Some dosage forms listed on this page may not apply to the brand name Hetlioz.
Applies to tasimelteon: oral capsule, oral suspension.
Serious side effects of Hetlioz
Along with its needed effects, tasimelteon (the active ingredient contained in Hetlioz) 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
- Bladder, lower back, or side pain
- bloody or cloudy urine
- difficult, burning, frequent, or painful urination
Other side effects of Hetlioz
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
- 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
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]
