To provide a method for treating or alleviating symptoms of depression and / or anxiety, comprising the step of administering to a subject a therapeutically effective amount of a NCAM peptidomimetic.A pharmaceutical composition comprising an NCAM peptidomimetic of the following structure: (FIG.【課題】治療有効量のNCAMペプチド模倣体を対象に投与する工程を含む、うつ病及び/又は不安症の症状を治療又は緩和するための方法の提供。【解決手段】以下の構造のNCAMペプチド模倣体を含む薬学的組成物。【選択図】図4