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Title: The effect of single oral doses of zopiclone on nocturnal melatonin secretion in healthy male volunteers.
Austin Authors: Norman, Trevor R ;Piccolo, J;Voudouris, N;Burrows, Graham D
Affiliation: Department of Psychiatry, University of Melbourne, Austin & Repatriation Medical Centre, Heidelberg, Victoria, Australia
Issue Date: 1-May-2001
Publication information: Progress in Neuro-psychopharmacology & Biological Psychiatry; 25(4): 825-33
Abstract: The effects of single oral doses of zopiclone and temazepam were investigated in eight healthy male volunteers using a single blind, placebo controlled cross over study. Doses of zopiclone were 7.5 and 15 mg while the dose of temazepam was 20 mg. Each dose was separated by at least a one-week washout period. For each subject the dim light melatonin onset (DLMO) was determined on a screening night and the drugs were administered at the time of the DLMO. Melatonin concentrations were determined by radioimmunoassay from plasma samples collected throughout the night. Both temazepam and zopiclone tended to reduce the amount of melatonin secreted, as determined by the area under the plasma concentration time curve. The differences from placebo were not statistically significant (F 3.31 = 1.07, P > 0.1). Similarly a repeated measures analysis of variance on the plasma concentration-time curves did not show any statistically significant differences between drugs and placebo (F 3.28 = 1.15, P > 0.1). There was no evidence from this study of a phase shifting effect of the drugs used. The reasons for the lack of effect on melatonin may be due to the differences in potency of the interaction of these drugs with the GABA-benzodiazepine-chloride ion channel.
Gov't Doc #: 11383979
Type: Journal Article
Subjects: Anti-Anxiety Agents.pharmacology
Area Under Curve
Azabicyclo Compounds
Cross-Over Studies
Dose-Response Relationship, Drug
Electroencephalography.drug effects
Hypnotics and Sedatives.pharmacology
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