The fundamental difference between TMS and ketamine is how they affect the brain. TMS treatment uses electromagnetic pulses to directly stimulate specific neural pathways, particularly in the prefrontal cortex, essentially “reawakening” underactive brain regions through focused energy. This mechanical stimulation strengthens connections among neurons over time, similar to how physical therapy might train a muscle.
Ketamine, on the other hand, works through chemical mechanisms, primarily affecting the brain’s glutamate system. It binds to NMDA receptors, triggering neurochemical changes, rapidly forming new neural connections, and promoting brain plasticity (adaptation and change). This process is often described as helping the brain “rewire” itself, potentially breaking out of rigid patterns associated with major depressive disorder (MDD) and other conditions.
TMS’s targeted approach to stimulating specific brain regions makes it a more precise procedure with fewer systemic effects. Unlike ketamine treatment, which affects multiple chemical systems throughout the body, patients can maintain mental clarity during and after TMS therapy, continue their daily activities, and avoid the risk of dependency or addiction.