What is the mechanism of action for Tasimelteon?

Tasimelteon primarily functions as a melatonin receptor agonist, which means it binds to and activates melatonin receptors in the body. Melatonin is a hormone that regulates the sleep-wake cycle by signaling to the body that it is time to sleep, and by mimicking the action of melatonin, Tasimelteon promotes a nocturnal sleep pattern.

This mechanism is particularly beneficial for treating certain sleep disorders, such as non-24-hour sleep-wake disorder, which often affects individuals who are blind. By stimulating melatonin receptors, Tasimelteon can help realign the internal circadian rhythm with the external environment, thereby improving sleep quality.

The other options refer to different mechanisms that do not apply to Tasimelteon. Some other medications might work by inhibiting neurotransmitter reuptake or enhancing GABA activity to promote sedation or sleep, but Tasimelteon specifically operates through its agonistic effect on melatonin receptors.