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The effects of acute treatment with ramelteon, triazolam, and placebo on driving performance, cognitive function, and equilibrium function in healthy volunteers

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Abstract

Rationale

Hypnotics are widely used to treat insomnia but adverse effects of different hypnotics, especially benzodiazepine receptor agonists, are getting more attention lately. The effects of novel hypnotics have not been fully examined.

Objective

This study aims to assess the effects of two hypnotics, ramelteon and triazolam, on driving performance, cognitive function, and equilibrium function.

Methods

In this double-blinded, three-way crossover trial, 17 healthy males received acute doses of 8 mg ramelteon, 0.125 mg triazolam, and placebo. The subjects were administered three driving tasks—road-tracking, car-following, and harsh-braking—using a driving simulator and three cognitive tasks—Continuous Performance Test, N-back Test, and Trail-Making Test—at baseline and at 1 and 4 h post-dosing. The Stanford Sleepiness Scale scores and computerized posturography were also assessed.

Results

In the driving simulations, ramelteon and triazolam increased the number of subjects who slid off the road. Triazolam increased the standard deviation of lateral position compared to ramelteon and placebo at 1 h post-dosing. Ramelteon and triazolam significantly increased the time to complete of Trail-Making Test part A and the environmental area in posturography compared to placebo at 1 and 4 h post-dosing. Ramelteon and triazolam significantly increased subjective sleepiness compared to placebo at 1 h post-dosing.

Conclusions

Ramelteon may affect road-tracking performance, visual attention and/or psychomotor speed measured by Trail-Making Test part A, and body balance in acute dosing. Lower dose of triazolam also impaired performance worse than ramelteon. Physicians should consider risks and benefits when prescribing both drugs, especially in the initial period of administration.

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Acknowledgments

We sincerely thank the healthy volunteers for participating in our study. This work was supported in part by research grants from the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Ministry of Health, Labor and Welfare of Japan;  the Center of Innovation Program from Japan Science and Technology Agency, JST; NEXCO Group Companies’ Support Fund to Disaster Prevention Measures on Expressways; the General Insurance Association of Japan; the Daiwa Syoken Health Foundation; the Mitsui-Sumitomo Wellness Foundation; and the Japan Foundation for Neuroscience and Mental Health.

Conflict of interest

Dr. K. Iwamoto has received speakers’ honoraria from Dainippon Sumitomo, Eisai, Eli Lilly, GlaxoSmithKline, Meiji Seika Pharma, Mochida, Otsuka, and Tanabe Mitsubishi. Dr. S. Iritani has received speakers’ honoraria from Eisai and Pfizer. Dr. N. Ozaki has received research support or speakers’ honoraria from, or has served as a consultant to Abbvie, Asahi Kasei Pharma, Astellas, Dainippon Sumitomo, Eisai, Eli Lilly, GlaxoSmithKline, Janssen, Meiji Seika Pharma, Mochida, MSD, Novartis Pharma, Ono, Otsuka, Pfizer, Shionogi, Takeda, Tanabe Mitsubishi, Sanofi, and Yoshitomi.

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Miyata, A., Iwamoto, K., Kawano, N. et al. The effects of acute treatment with ramelteon, triazolam, and placebo on driving performance, cognitive function, and equilibrium function in healthy volunteers. Psychopharmacology 232, 2127–2137 (2015). https://doi.org/10.1007/s00213-014-3843-4

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