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“ Zopiclone is chemically unrelated to benzodiazepines, but has a similar effect of potentiating the function of γ-aminobutyric acid (GABA) at the GABAA receptor complex (Karle and Nielsen, 1998).”
The international journal of neuropsychopharmacology • 2005 | View Paper
“Furthermore, zopiclone slightly but significantly decreased GABA content in the hippocampus, the decrease being blocked by coadministration of the benzodiazepine receptor antagonist Ro 15-1788.”
“Intraperitoneal administration of zopiclone reduced the GABA turnover rates in both the striatum and hippocampus, as estimated from the rate of GABA accumulation after inhibition of GABA transaminase by aminooxyacetic acid (AOAA).”