Comparison
Ketamine vs ECT
ECT remains the most effective treatment for severe, treatment-resistant depression. Ketamine is faster to access, less invasive, and easier to repeat — but does not match ECT's response rate in the most severe cases.
Medically reviewed by: Pending medical review(draft)Last updated: June 4, 2026Evidence: Educational synthesis - not medical advice
Ketamine
ECT (electroconvulsive therapy)
Mechanism
NMDA antagonism, glutamate surge, BDNF-driven synaptic plasticity.
Brief electrical stimulation under general anesthesia triggers a controlled seizure, producing widespread neurochemical and neuroplastic changes.
Evidence
Strong short-term evidence in TRD; growing data on durability with maintenance.
Decades of evidence; highest response and remission rates in severe TRD and psychotic depression.
Onset
Hours to days.
Typically by sessions 4-6 (over 2-3 weeks).
Duration
Days to weeks per session; requires maintenance.
Weeks to months; maintenance ECT often used.
Side effects
Transient dissociation, blood pressure rise, nausea.
Short-term memory loss, headache, muscle soreness, anesthesia risks.
Access
Specialty outpatient clinics.
Hospital-based; requires anesthesia team.
Best for
Moderate-to-severe TRD where rapid relief and outpatient delivery matter.
Severe TRD, psychotic depression, catatonia, acute suicidality, and cases where prior treatments have failed.
Limits
Lower response rates than ECT in the most severe cases.
Stigma, cognitive side effects, access barriers, anesthesia risk.
Educational use only. The content on this page is provided for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Ketamine and related therapies carry risks and are appropriate only under qualified medical supervision. Always consult a licensed healthcare professional about your individual situation. Information may change as research evolves.