Phase III trials studying the efficacy and safety of MK-4305 in elderly and non-elderly insomnia patients are ongoing. Merck anticipates filing regulatory applications for MK-4305 in 2012.
"Since the discovery and characterization of orexin over the past decade as an important component of the sleep-wake system, Merck has been actively committed to discovering and developing potential interventions for sleep disorders that target the orexin receptors. We are encouraged by these phase II results showing positive effects of MK-4305 in patients with primary insomnia,”... Merck's Press Release -