The Role of Ketamine in Treatment-resistant Depression: A Narrative Review

Summary & key facts

This narrative review looks at ketamine as a treatment for people whose depression has not improved with standard therapies. Ketamine works by blocking NMDA receptors in the brain. The review reports that repeated ketamine treatments can produce rapid, strong, and sustained antidepressant effects, but it also highlights side effects and uncertainty about long-term safety. The authors say more research is needed to find safer drugs with the same benefit and to identify tests that predict who will respond.

Key facts:

• Ketamine is described as a non-competitive N-methyl-D-aspartate (NMDA) receptor antagonist, meaning it blocks a specific brain receptor involved in glutamate signaling.
• The review summarizes evidence that repeated ketamine treatments produce rapid, robust, and sustained antidepressant effects in treatment-resistant depression.
• Major safety concerns reported include dissociative symptoms, hemodynamic instability (effects on blood pressure and circulation), and the risk of abuse with long-term ketamine use.
• The review covers ketamine's basic pharmacodynamics and the neurobiological mechanisms thought to underlie its antidepressant effects.
• The authors highlight gaps in knowledge: the long-term effects of ketamine therapy are not well established, and more research is needed on safer alternatives and on biomarkers to predict who will benefit.

Abstract

Ketamine, a non-competitive N-methyl-D-aspartate receptor antagonist, has emerged as an effective therapeutic agent for the management of treatment-resistant depression. Repeated treatments with ketamine show rapid, robust, and sustained antidepressant effects. Despite the large body of evidence, key concerns include adverse effects such as dissociative symptoms, hemodynamic instability, and the risk of abuse with long-term ketamine therapy. This narrative review provides an overview of the neurobiological mechanisms underlying ketamine’s antidepressant effects, its basic pharmacodynamics, and its safety profile. The clinical evidence regarding ketamine’s efficacy in depression is also summarized, and the need for further research on the long-term effects of ketamine therapy, the development of agents with similar antidepressant effects but fewer adverse effects or potential for abuse, and the identification of biomarkers to predict the response to ketamine is highlighted.

Topics

Stress Responses and Cortisol Treatment of Major Depression Tryptophan and brain disorders

Categories

Health Sciences Medicine Pharmacology

Tags

Art Depression (economics) Economics Ketamine Keynesian economics Literature Major depressive disorder Mood Narrative Narrative review Psychiatry Psychoanalysis Psychology Psychotherapist Treatment-resistant depression

Substances

Ketamine

Conditions & symptoms

Depression Lack of energy or motivation Poor sleep Sadness or low mood