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Post-bedtime dosing with indiplon in adults and the elderly: results from two placebo-controlled, active comparator crossover studies in healthy volunteers. | LitMetric

Objective: To assess the effects of post-bedtime dosing with indiplon on next-day function in adults and the elderly.

Research Design And Methods: Two randomized, double-blind, placebo-controlled crossover studies were conducted in two groups of healthy volunteers: an adult study (18-45 years) and an elderly study (65-80 years). In adults, a single post-bedtime dose of indiplon 10 mg and 20 mg was compared to placebo, with zolpidem 10 mg and zopiclone 7.5 mg included as controls. In the elderly, a single post-bedtime dose of indiplon 5 mg and 10 mg was compared to placebo, with zopiclone 3.75 mg included as a control. Next-day residual effects were evaluated in the morning at 4 and 6 h post-dose in adults, and 4, 6, and 8 h in the elderly, by a Visual Analog Scale of sleepiness (VAS-sleepiness), Digit Symbol Substitution Test (DSST), and the Symbol Copying Test (SCT).

Results: In adults, there were no statistically significant differences between indiplon and placebo on the VAS-sleepiness, DSST, or SCT at any time-point for either dose. In contrast, a significant increase versus placebo in VAS-sleepiness was observed for both zopiclone (at 4 and 6 h post-dose; p < 0.0001 and p = 0.002, respectively) and zolpidem (at 4 h post-dose; p = 0.042). In the elderly, there were no statistically significant differences between indiplon 5 mg and placebo on the VAS-sleepiness, DSST, or SCT at any time-point. DSST was significantly reduced for indiplon 10 mg versus placebo at 4 h only (p = 0.022), compared with a significant reduction in DSST for zopiclone at both 4 and 8 h post-dose (p = 0.002 and p = 0.003, respectively). In adults, the overall incidence of adverse events was higher on zopiclone compared to indiplon, zolpidem, and placebo. In the elderly, the incidence of adverse events was similar for indiplon, zopiclone, and placebo. Potential limitations of the current study include recruitment of healthy volunteers and the use of a limited pharmacodynamic battery.

Conclusions: Indiplon, at doses of 10 mg in adults and 5 mg in the elderly, was not associated with next day residual sedation or impairment in simple cognitive and psychomotor tasks when administered during the night 4 h prior to awakening.

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http://dx.doi.org/10.1185/030079908X273327DOI Listing

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