RecruitingPhase 2Drug trialThe Impact of AMPA Receptor Blockade on Ketamine's Anti-Suicidal EffectsThe purpose of this study is to test the hypothesis that the anti-depressant and anti-suicidal effects of the N-methyl-D-aspartate receptor (NMDAR) antagonist Ketamine is critically dependent on stimulation of Alpha-Amino-3-Hydroxy-5-Methyl-4-Isoxazole Propionic Acid receptors (AMPAR).