Zopiclone, (brand name Imovane in Canada, and Zimovane in the UK) is a non-benzodiazepine hypnotic agent used in the treatment of insomnia. In the United States, zopiclone is not commercially available[1], although its active stereoisomer, eszopiclone, is sold under the names Lunesta (see History). Zopiclone is a controlled substance in the United States, Canada, Japan, Brazil and some European countries, and may be illegal to possess without a prescription.