The present disclosure relates to the subcutaneous administration of compound (I) or a pharmaceutically acceptable salt thereof for treating diseases or disorders mediated by negative allosteric modulation or inhibition of NR2B-containing NMDA receptors, including but not limited to depressive disorders (e.g.,
major depressive disorder, treatment-resistant depression, suicidal tendency in
major depressive disorder,
major depressive disorder with suicidal ideation, major depressive disorder with suicidal ideation and intent, suicidal tendency, and seasonal affective disorder). The present disclosure also relates to the use of compound (I) or a pharmaceutically acceptable salt thereof in the treatment of treatment-resistant depression in patients with major depressive disorder. 【Chemical 1】 TIFF2025518778000031.tif20170