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Antidepressant Actions of Ketamine and Its Two Enantiomers

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Ketamine

Abstract

The N-methyl-d-aspartate receptor antagonist ketamine has been widely used as an off-label medication to treat depression because it elicits rapid and robust antidepressant effects in treatment-resistant patients with depression. (R,S)-ketamine is a racemic mixture containing equal amounts of (R)-ketamine (or arketamine) and (S)-ketamine (or esketamine). On March 5, 2019, the United States Food and Drug Administration approved an (S)-ketamine nasal spray for treatment-resistant depression. In contrast, (R)-ketamine has been reported to have a greater potency and longer-lasting antidepressant effects than (S)-ketamine in rodent models of depression. However, the precise mechanisms underlying the robust antidepressant effects of ketamine enantiomers remain unknown. In this chapter, we discuss recent findings on the antidepressant actions of two enantiomers of ketamine.

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Acknowledgments

This study was supported by grant from AMED, Japan (to K.H., JP19dm0107119). Dr. Lijia Chang was supported by the Japan China Sasakawa Medical Fellowship (Tokyo, Japan). Dr. Yan Wei (Southwest Medical University, China) was supported by the China Scholarship Council (China).

Disclosure Statement: Dr. Hashimoto is the inventor of filed patent applications on “The use of R-ketamine in the treatment of psychiatric diseases” by the Chiba University. Dr. Hashimoto also declares that he has received research support and consultant from Dainippon Sumitomo, Otsuka, and Taisho.

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Correspondence to Kenji Hashimoto .

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© 2020 Springer Nature Singapore Pte Ltd.

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Chang, L., Wei, Y., Hashimoto, K. (2020). Antidepressant Actions of Ketamine and Its Two Enantiomers. In: Hashimoto, K., Ide, S., Ikeda, K. (eds) Ketamine. Springer, Singapore. https://doi.org/10.1007/978-981-15-2902-3_7

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