Abstract
Oxazepam and its chlorinated derivative, lorazepam, have similar half-lives but differing potencies. This study compared the effects of these two benzodiazepines with a placebo on memory, mood and psychomotor function. Thirty six volunteers took part in a double-blind, independent groups design. Subjects completed a battery of tests before and 2.5 h after drug administration. Lorazepam 2 mg produced more profound subjective and motor sedation than oxazepam 30 mg, and this in turn produced a similar, global pattern of impairments across a wide range of tasks. However, lorazepam produced greater decrements than oxazepam on a task involving episodic memory even when sedative effects were partialled out. We suggest that this finding may reflect either differential task sensitivities or a contribution of priming to performance on the explicit memory task.
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