How Ketamine Works

Ketamine exerts its rapid antidepressant and anxiolytic effects primarily through modulation of the brain’s glutamatergic system:

• NMDA Receptor Antagonism
  Ketamine binds to and blocks N-methyl-D-aspartate (NMDA) receptors on inhibitory GABA interneurons. This disinhibition leads to a surge of glutamate release from excitatory neurons.
• AMPA Receptor Activation & Synaptogenesis
  The glutamate burst preferentially stimulates α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors. AMPA activation triggers intracellular signaling cascades—particularly the mammalian target of rapamycin (mTOR) pathway—that boost production of brain-derived neurotrophic factor (BDNF) and other synaptic proteins. Within hours, new synaptic connections form in key mood-regulating regions like the prefrontal cortex and hippocampus.
• Rapid Mood Improvement
  Unlike traditional antidepressants, which may take weeks to remodel neural circuits, ketamine’s mechanism delivers symptom relief often within hours and can last days to weeks after a single infusion.
• Additional Neurochemical Effects
  Ketamine also interacts with opioid, monoaminergic, and cholinergic receptors, which may contribute to mood stabilization and reduction of suicidal ideation.