New hypnotics ramelteon for the treatment of insomniacs with circadian rhythm disturbance |
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Authors: | Mishima Kazuo |
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Institution: | Department of Psychophysiology, National Institute of Mental Health, National Center for Neurology and Psychiatry. |
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Abstract: | Ramelteon is a new class of sleep agent that selectively binds to the melatonin type 1 (MT1) and type 2 (MT2) receptors in the suprachiasmatic nucleus (SCN), instead of binding to GABA-A receptors such as with traditional hypnotics benzodiazepines. Ramelteon exhibits not only acute sleep-promoting effect but also circadian phase-shifting effect via MT1 and MT2 receptors respectively, and has been revealed to contribute to the treatment of acute and chronic insomnia in patients with circadian rhythm sleep disorders(sleep-wake rhythm disorders) or with inappropriate timing of sleep habits. Optimal administration plan for insomniac patients to induce these characteristic sleep-modulating effects by ramelteon was discussed. |
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