Evaluation of Current Evidence on the Efficacy of Esketamine in Treating Substance-Use Disorders in Patients With Treatment-Resistant Depression (TRD): A Narrative Review
Cureus – March 14, 2026
Source: OpenAlex
Summary
Esketamine shows promise as a dual-action treatment for patients with treatment-resistant depression (TRD) and comorbid substance use disorders (SUDs). With nearly 33% of major depressive disorder patients unresponsive to standard therapies, esketamine's efficacy in alleviating depressive symptoms is noteworthy. Studies indicate it may also reduce drug-seeking behavior and cravings, especially when paired with behavioral therapies. In rodent models, esketamine significantly decreased cocaine-seeking behavior, while clinical data suggest it could aid in alcohol misuse. Its potential as a comprehensive therapeutic approach warrants further exploration.
Abstract
Treatment-resistant depression (TRD) presents a complex clinical challenge, particularly when comorbid with substance use disorders (SUDs) or other compulsive behaviors. With up to a third of major depressive disorder (MDD) patients failing to respond to standard antidepressant therapies, there is growing interest in interventions such as esketamine, a glutamatergic N-methyl-D-aspartate (NMDA) receptor antagonist approved for TRD in 2019, as an intranasal therapy. While esketamine has demonstrated efficacy in alleviating depressive symptoms of TRD, emerging data also point towards its potential in addressing compulsive and addictive behaviors, particularly in patients whose depression and SUDs are deeply intertwined. This review aims to evaluate and synthesize the current literature on the use of esketamine in treating not only TRD, but specifically its application in patients suffering from comorbid substance use and addiction-related behaviors. We aim to clarify the therapeutic mechanisms, examine both human and animal data, and identify whether esketamine offers a dual-modality treatment approach that concurrently reduces depressive symptoms and addictive tendencies. Across peer-reviewed studies, including randomized control trials, cohort analyses, systematic reviews, and preclinical investigations, findings suggest that esketamine may reduce drug-seeking behavior, attenuate cravings, and improve outcomes when combined with behavioral interventions (such as mindfulness-based therapy). In rodent models, esketamine significantly inhibited cocaine-seeking after various abstinence conditions, and clinical data point to its potential role in treating alcohol misuse. In conclusion, esketamine holds potential as a dual-action therapeutic in patients with TRD and comorbid addiction; however, further large-scale studies are needed to explore its therapeutic magnitude, duration of benefit, safety, and effects on substance use-related outcomes.