Major depression represents one of the most disabling illnesses worldwide and current treatments are only partially effective. All antidepressant agents modulate the monoamine system, which likely accounts for the similar efficacy profile of available treatments. Herein we summarize the current state of depression therapeutics and assess the antidepressant development pipeline. Antidepressant response rates in controlled trials are estimated at ~54 % and real-world effectiveness data suggests a somewhat lower rate. Response rates are lower still in patients who have not responded to previous treatment attempts and meaningful advancements will likely come only from identification of mechanistically novel agents. Monoaminergic agents largely dominate the antidepressant development pipeline, however the glutamate neurotransmitter system represents a bright spot on the antidepressant horizon. We review in detail findings regarding the antidepressant effects of the glutamate N-methyl-d-aspartate receptor antagonist ketamine in order to highlight the promise of novel agents as future treatments for major depression.
Current Psychiatry Reports – Springer Journals
Published: Sep 21, 2012
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