Efficacy of oral physostigmine in primary degenerative dementia
To examine the efficacy of cholinergic enhancement in senile dementia of the Alzheimer type (SDAT), oral physostigmine was given to eight patients in a cross-over trial of three dose levels and a matching placebo. A dose-related improvement in memory as measured by objective verbal memory tests was observed. Performance was significantly better on the highest dose, 2 mg every 2 h, than on the lower doses. The effect was most systematically present for very short-term memory, which raises the question of whether the improvement may involve attention rather than longer term storage and retrieval.