VIENNA – Modafinil shows potential for the treatment of episodic and working memory dysfunction in patients with remitted depression, Muzaffer Kaser, MD, reported at the annual congress of the European College of Neuropsychopharmacology.
He presented a randomized, double-blind, placebo-controlled proof-of-concept study in which 60 patients with remitted depression undertook a battery of cognitive tests before and 2 hours after either a single 200-mg dose of modafinil or placebo.
“For episodic memory we saw a medium-to-large effect size for modafinil’s effects over placebo, and a medium effect size for working memory. So for administration of a single dose we think these results are quite promising,” said Dr. Kaser, a psychiatrist and PhD candidate at the University of Cambridge, England.
Bruce Jancin/Frontline Medical News
Dr. Muzaffer Kaser
Longer-term studies of modafinil are planned in light of the major unmet need for treatments to address cognitive dysfunction in depression, he added in an interview. Currently, there are none. Yet it is now recognized that cognitive dysfunction in the domains of memory, attention, and planning are a core feature of depression, and they tend to persist after mood symptoms have recovered.
“Because of the cognitive dysfunction, people have difficulty getting back to work at the same pre-illness level, which creates more stress and increases the potential for future relapse. So cognitive dysfunction in depression should be a target for treatment,” the psychiatrist said.
Modafinil’s well-established safety profile makes it an attractive candidate, he continued. In placebo-controlled studies of the drug as augmentation therapy for depression, modafinil’s side effects were at the placebo level.
In this proof-of-concept study, the payoff with a single dose of modafinil was confined to the domain of memory, where the effects were most evident at the most difficult stages of the tests. Most impressively, the modafinil group made half as many errors on the episodic memory test. However, the drug did not improve performance on tests of planning accuracy or sustained attention.
Study participants had a mean of 3.2 prior depressive episodes and were in their current remission for 8.2 months.
The tests were drawn from the Cambridge Neuropsychological Test Automated Battery. They included the Paired Associates Learning measure of episodic memory, Spatial Working Memory, the Stockings of Cambridge measure of planning and executive function, and the Rapid Visual Information Processing measure of sustained attention.
The study was funded by the U.K. Medical Research Council and the Wellcome Trust. Dr. Kaser reported having no financial conflicts of interest.
Correction, 12/15/16: An earlier version of this article misstated Dr. Kaser's name in the photo caption.