This disclosure features combinations of NMDAR modulating compounds. This disclosure features combinations that include one or mor NMDAR antagonists and GLYX-13 (each of which is sometimes referred to herein as a 'component"). The beneficial effects of the combination are based, in part, on the finding that administration of GLYX-13 (e.g., a single dose) can reverse and/or prevent NMDAR antagonist-induced cognitive impairment (e.g., NMDAR antagonist-induced impairment in novel object recognition； e.g., induced through repeated dosing of the NMDAR antagonist).
