Merck's Insomnia Medicine Belsomra (suvorexant) Now Available in the US

Merck (MSD outside the US and Canada) has announced that Belsomra (suvorexant) is now available at
pharmacies in the US for the treatment of insomnia in adults who have difficulty falling asleep and/or staying asleep. Belsomra is the only orexin receptor antagonist approved for the treatment of insomnia in the US. Orexin is one of the many neurotransmitters in the brain involved in promoting wakefulness, and Belsomra selectively blocks orexin receptors. In doing this, Belsomra is thought to suppress wake drive in the brain.

“Insomnia is a serious condition that affects millions of Americans,” said David Cloud, CEO of the National Sleep Foundation. “With Belsomra, healthcare professionals and patients now have an additional option to consider.”

The recommended dose of Belsomra is 10 mg, taken no more than once per night and within 30 minutes of going to bed, with at least 7 hours remaining before the planned time of awakening. The total dose should not exceed 20 mg once daily.

In the brain’s wake/sleep circuitry, two systems work together to regulate wake and sleep. The system that is more active determines whether a person is awake or asleep. The orexin signaling system is a central promoter of wakefulness. Scientists currently at Tsukuba University, Kanazawa University in Japan, and Stanford University in the US first discovered orexin in 1998.

“Merck has been conducting research in the sleep field for more than a decade,” said Dr David Michelson, vice president, Neurosciences, Merck Research Laboratories. “We are proud to be one of the earliest companies to research the role of orexin receptors in insomnia, which ultimately led to the introduction of Belsomra in the US.”