The Carry‐over Effects of Triazolam Compared with Nitrazepam and Placebo in Acute Emergency Driving Situations and in Monotonous Simulated Driving

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Abstract
Eighteen healthy volunteers of both sexes, aged 20–34, were tested in the morning while undertaking real car driving avoidance manoeuvres and during monotonous simulated driving after 1 and 3 nights of medication with triazolam 0.25 mg, nitrazepam 5 mg or placebo. The study was a double‐blind, randomized, cross‐over study, where a minimum of 7 days wash‐out separated the 3 treatment periods. Nitrazepam was found to impair performance in the simulated task after 1 but not after 3 nights of medication. Performance in the triazolam condition was not significantly different from the other conditions on this task on either day. However, after one night of medication triazolam tended to score worse than placebo but better than nitrazepam. In real car driving a tendency was noted for nitrazepam to score worst, whereas the difference between placebo and triazolam was hardly noticeable. The same tendency appeared on both days.

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