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Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't
A double-blind study of the influences of eszopiclone on dysgeusia and taste function.
Pharmacology, Biochemistry, and Behavior 2009 December
Taste disturbance is a common, but poorly understood, side effect of a large number of medications. This double-blind study examined the frequency, intensity, and quality of taste disturbances related to the widely used hypnotic sleep aid eszopiclone (ESZ; Lunesta, as well as their associations with age, sex, body mass index (BMI), time of day, phenyl thiocarbamide (PTC) taste sensitivity, and ESZ saliva and blood levels. Sixty six percent of 24 female subjects and 53% of 15 male subjects reported dysgeusic sensations, mostly bitter/metallic, during the drug administration (respective placebo figures 17% and 7%). No meaningful relationships were found between the frequency or the intensity of the sensations and age, BMI, or PTC taste sensitivity. Dysgeusia was more intense and longer lasting in women than in men, stronger in the morning than in the evening, and positively correlated with drug plasma and saliva levels. In women, intensity ratings decreased across treatment days. Taste test measures were marginally, at best, influenced by ESZ. This study demonstrates, for the first time, that the dysgeusia associated with ESZ is systemically influenced by a number of factors, including sex, time since drug administration, and both blood and saliva levels of the drug.
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