1Twelve normal subjects were tested on a large battery of tests after a hypnotic dose of flunitrazepam (1 or 2 mg) and a placebo. Psychological tests were given 12 h after the drug and physiological tests 1 2, 15 and 18 h after the drug. 2 The tests included self-ratings of hypnotic effects and mood, the electroencephalogram, the auditory electroencephalographic evoked response, skin conductance, tapping, cardsorting and the symbol copying test. 3 Both doses of flunitrazepam were effective hypnotics according to the ratings, with an anxiolytic effect the following day. The EEG was significantly altered up to 18 h after the drug and the behavioural tests showed a motor impairment 12 h after drug administration. 4 Nearly all changes displayed linear dose-related trends.

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