What Is Ketamine Therapy?

Ketamine has been used safely in medicine for more than 50 years as an anesthetic. More recently, researchers discovered that at much lower doses, it can produce rapid antidepressant effects in some individuals with treatment-resistant depression.

Unlike traditional antidepressants, which primarily affect serotonin or norepinephrine, ketamine works through the glutamate system, the brain’s primary excitatory neurotransmitter. By blocking NMDA receptors, ketamine increases glutamate signaling through AMPA receptors, promoting the release of brain-derived neurotrophic factor and enhancing synaptic plasticity—the brain’s ability to strengthen and form new neural connections.

These mechanisms may help explain why ketamine can produce improvement within hours to days rather than the several weeks often required for conventional antidepressants.

Ketamine is not appropriate for everyone, but for carefully selected patients it represents one of the most important advances in depression treatment in recent decades.

Final Thoughts

Ketamine offers a fundamentally different approach to treating depression by targeting brain plasticity rather than simply altering neurotransmitter levels.