High Quality Content by WIKIPEDIA articles! 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, although its active stereoisomer, eszopiclone, is sold under the name Lunesta (see History). Zopiclone is a controlled substance in the United States, Japan, Brazil and some European countries, and may be illegal to possess without a prescription.