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Zopiclone (brand names Zimovane and Imovane) is a nonbenzodiazepine hypnotic agent used in the treatment of insomnia. It is a cyclopyrrolone, which increases the normal transmission of the neurotransmitter GABA in the central nervous system, as benzodiazepines do, but in a different way. As zopiclone is sedating, it is marketed as a sleeping pill. It works by causing a depression or tranquilization of the central nervous system. After prolonged use, the body can become accustomed to the effects of zopiclone. When the dose is then reduced or the drug is abruptly stopped, withdrawal symptoms may result. These can include a range of symptoms similar to those of benzodiazepine withdrawal. Although withdrawal from therapeutic doses of zopiclone and its isomers (i.e. eszopiclone) do not typically present with convulsions and are therefore not considered life-threatening, patients may experience such significant agitation and/or anxiety that they seek emergency medical attention. In the United States, zopiclone is not commercially available,〔(【引用サイトリンク】title=Zopiclone consumer information from )〕 although its active stereoisomer, eszopiclone, is sold under the name Lunesta. Zopiclone is a controlled substance in the United States, Japan, Brazil, and some European countries, and may be illegal to possess without a prescription. However, it is readily available in other countries where it is marketed under the brand name Imovane, and is not a controlled substance in its available 7.5 mg, 5 mg, and 3.75 mg oral tablet formulations. Zopiclone is known colloquially as a "Z-drug". Other Z-drugs include zaleplon (Sonata) and zolpidem (Ambien and AmbienCR) and were initially thought to be less addictive and/or habit-forming than benzodiazepines. However, this appraisal has shifted somewhat in the last few years as cases of addiction and habituation have been presented. Zopiclone is recommended to be taken on a short-term basis, usually a week or less.〔http://www.nice.org.uk/nicemedia/pdf/TA077publicinfoenglish.pdf〕 Daily or continuous use of the drug is not usually advised. ==Medical uses== Zopiclone is indicated for the short-term treatment of insomnia where sleep initiation or sleep maintenance are prominent symptoms. Long-term use is not recommended, as tolerance, dependence, and addiction can occur with prolonged use. Zopiclone is ineffective in increasing daytime sleep time in shift workers. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Zopiclone」の詳細全文を読む スポンサード リンク
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