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Concept
Ramelteon
Summary
Ramelteon, sold under the brand name Rozerem among others, is a melatonin agonist medication which is used in the treatment of insomnia. It is indicated specifically for the treatment of insomnia characterized by difficulties with sleep onset. It reduces the time taken to fall asleep, but the degree of clinical benefit is small. The medication is approved for long-term use. Ramelteon is taken by mouth.
Side effects of ramelteon include somnolence, dizziness, fatigue, nausea, exacerbated insomnia, and changes in hormone levels. Ramelteon is an analogue of melatonin and is a selective agonist of the melatonin MT1 and MT2 receptors. The half-life and duration of ramelteon are much longer than those of melatonin. Ramelteon is not a benzodiazepine or Z-drug and does not interact with GABA receptors, instead having a distinct mechanism of action.
Ramelteon was first described in 2002 and was approved for medical use in 2005. Unlike certain other sleep medications, ramelteon is not a controlled substance and has no known potential for misuse.
Ramelteon is approved for the treatment of insomnia characterized by difficulty with sleep onset in adults. In regulatory clinical trials, it was found to significantly reduce latency to persistent sleep (LPS). A 2009 pooled analysis of four clinical trials found that ramelteon at a dose of 8 mg reduced sleep onset by 13 minutes (30% decrease) relative to placebo on the first and second nights of use. Subsequent meta-analyses of longer-duration use have found that ramelteon decreases subjective sleep latency by about 4 to 7 minutes. Meta-analyses are mixed on whether ramelteon increases total sleep time. Ramelteon also improves sleep quality ( () –0.074, 95% () –0.13 to –0.02) and sleep efficiency. The clinical improvement in insomnia with ramelteon is small and of questionable benefit.
Ramelteon is approved in the United States but was not approved in the European Union owing to concerns that it lacked effectiveness.
Official source
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