| CPC A61K 33/00 (2013.01) [A61K 31/42 (2013.01); A61P 25/24 (2018.01)] | 6 Claims |

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1. A method for preventing or treating depression comprising administering to a subject in need there of a therapeutically effective amount of (i) cycloserine or a pharmaceutically acceptable salt thereof; and (ii) lithium or a pharmaceutically acceptable salt thereof,
wherein a weight ratio of (i) the cycloserine or the pharmaceutically acceptable salt thereof; and (ii) the lithium or the pharmaceutically acceptable salt thereof is 10:5 to 10:1.
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