Tasimelteon is a sedative, also called a hypnotic. It works by affecting certain substances in your body that help regulate your "sleep-wake cycle." Tasimelteon is used to treat non-24-hour sleep-wake disorder. Tasimelteon may also be used for purposes not listed in this medication guide.
Hetlioz is a hypnotic medication that is used to help regulate the sleep-wake cycle of your body. It is the first medication approved by the FDA for the treatment of Non-24 Hour Sleep-Wake disorder, which affects individuals with total blindness.