Anxiolytics and memory: a comparison of lorazepam and alprazolam.

Thirty healthy male volunteers participated in a double-blind, placebo-controlled study to investigate whether mild anterograde memory impairment is found after lorazepam has been taken for 5 days. The study compares the amnestic properties of lorazepam and alprazolam on immediate and delayed recall of word lists under the same conditions. Results suggest that individuals who take benzodiazepines will perform less well on an anterograde memory delayed recall task completed after dosing on the sixth day of treatment, but no similar difference will be found in performance on a similar task completed just before dosing on the sixth day. In addition, results suggest there is no significant difference between alprazolam and lorazepam on anterograde memory task effect. The chronic use of lorazepam 1 mg and alprazolam 0.5 mg had no effect on immediate recall of word lists, on the long-term recall of a word list already committed to memory, or on hand-eye coordination as measured in a standard way.