How Does Ketamine Impact the Brain
Ketamine works by blocking N-methyl-D-aspartate (NMDA) receptors in the brain, which are involved in pain perception, learning, and memory. This is what produces a dissociative, euphoric, and anesthetic effect. It is also thought to increase the release of neurotransmitters such as dopamine and serotonin, which are associated with mood regulation hence its proposed use in the treatment of mental illness.
Ketamine can be administered intravenously, intramuscularly, and nasally (see Spravato), all forms with a rapid onset of action and whose effects are typically felt within minutes lasting between 30 minutes to an hour depending on the dose.