Isomer of zopiclone with similar hypnotic effects as benzodiazepines.Used for insomnia. At latest update no published data on excretion into breast milk were found. Zopiclone is excreted in milk in non-significant amount. Because the available published experience is poorer than with other drugs of the same group, it would be preferable an alternative and better known drug that would be considered safer, especially during the neonatal period and in case of prematurity.