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Ramelteon is a hypnotic with a novel mechanism of action and is the only melatonin agonist currently indicated for the treatment of insomnia. This drug acts at the MT1 and MT2 receptors to promote sleep and exert an effect on circadian rhythms. Unlike traditional hypnotics, ramelteon demonstrates no affinity for any CNS receptors commonly associated with sedation (GABA, dopamine, opiate, serotonin).

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