Abstract
The actions of flunitrazepam (Rohypnol) were assessed on the sleep cycle, heart and respiratory rates and skin potential fluctuations of normal volunteers and neurotic patients with insomnia by means of all night recordings. The most conspicuous effect of flunitrazepam (2 mg p.o.) in the healthy subject's sleep cycle was an increase of the latency for the appearance of the first REM period. In the insomniacs the compounds was effective in inducing and maintaining sleep. Flunitrazepam diminished heart rates during the REM phases and significantly decreased the variability indices, this effect being more prominent in the normal subjects. Skin potential fluctuations during stages 2 and REM sleep were also decreased although tolerance developed rapidly in this connection.
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