Ketamine vs ECT for Treatment-Resistant Depression: A San Diego Physician’s Comparison
When standard antidepressants stop working — or never worked to begin with — two of the most powerful options available for treatment-resistant depression (TRD) are ketamine therapy and electroconvulsive therapy (ECT). Both have compelling evidence. Both can produce meaningful results in patients who have failed multiple prior treatments. And both carry significant misconceptions that can make the decision harder than it needs to be.
This article offers an honest, clinical comparison of the two treatments — what they are, how they work, what the experience is actually like, and when each one makes more sense.
What Is ECT?
Electroconvulsive therapy is a psychiatric procedure in which brief electrical stimulation is applied to the brain while the patient is under general anesthesia, producing a controlled seizure. It is performed in a hospital or outpatient surgical setting, typically two to three times per week for three to four weeks (six to twelve sessions total).
ECT has been used since the 1930s and has one of the most robust evidence bases in psychiatry — far larger than ketamine’s. It is highly effective for severe, treatment-resistant depression, with response rates often cited between 60 and 80 percent for appropriately selected patients.
The modern version of ECT bears no resemblance to its historical depiction. Patients are fully anesthetized with muscle relaxants, there is no visible convulsion, and the procedure itself lasts only minutes. Patients typically wake up in a recovery room feeling drowsy and disoriented, and most can go home the same day.
What Is Ketamine Therapy?
Ketamine therapy involves the physician-supervised administration of sub-anesthetic doses of ketamine — most commonly via IV infusion — to rapidly modulate the glutamate system and promote neuroplasticity. A standard initial series involves six infusions over two to three weeks, each lasting approximately 40–60 minutes, without general anesthesia.
Six Key Dimensions: Side by Side
1. Speed of Response
Both treatments are among the fastest-acting interventions for severe depression — significantly faster than standard antidepressants.
Ketamine often produces noticeable improvement within hours to days of the first infusion. ECT typically requires two to four sessions — about one to two weeks — before significant improvement appears.
For acute crisis presentations, suicidal ideation, or patients who are severely impaired and need rapid stabilization, ketamine’s speed advantage is clinically meaningful.
2. Efficacy in Treatment-Resistant Depression
ECT has a slight edge on overall response rates in true TRD — particularly for the most severe presentations, including psychotic depression, severe melancholia, and depression with active refusal to eat or drink (catatonic presentations). ECT’s evidence base is simply larger and more established for these extremes.
For moderate-to-severe TRD without psychosis, ketamine and ECT show comparable response rates in the research literature — and ketamine continues to accumulate evidence rapidly.
3. Cognitive Side Effects
This is the dimension where the two treatments diverge most significantly.
ECT — particularly bilateral electrode placement — commonly produces memory impairment. Most commonly this involves the period around treatment (anterograde and retrograde amnesia around the ECT sessions), and for most patients this resolves over weeks to months. However, a subset of patients report more persistent memory difficulties, and this remains the most significant concern associated with ECT.
Ketamine does not produce lasting cognitive side effects at therapeutic doses. There is no equivalent memory concern. The acute dissociative experience resolves within hours, and patients consistently show preserved — often improved — cognitive function following a treatment series.
4. Treatment Experience
ECT: General anesthesia is required. The patient is unconscious during the procedure. There is no therapeutic “experience.” Side effects in the recovery period include headache, muscle aches, disorientation, and nausea — similar to waking from any general anesthetic.
Ketamine: No general anesthesia. The patient remains conscious throughout in a supported, monitored setting. The experience is immersive and dissociative — many patients describe it as profoundly meaningful, visually rich, emotionally significant, or deeply calming. This experience is not incidental — for many patients, it is a central mechanism of the healing.
5. Logistics and Accessibility
ECT requires a hospital or accredited surgical setting, a formal psychiatry referral in most cases, a dedicated anesthesia team, and a family member or caregiver available for each session.
Ketamine can be administered in an outpatient clinic setting like Seaside Ketamine. No hospital affiliation is required. Patients need a driver home but can otherwise manage logistics more independently.
6. Availability and Cost
ECT is covered by most insurance plans when medically indicated and ordered by a psychiatrist. However, it is only available at hospital-based facilities — which limits geographic accessibility.
Ketamine therapy is generally not covered by insurance for IV infusions (Spravato/esketamine has separate insurance pathways), but is available at specialized outpatient clinics throughout the San Diego area.
When ECT May Be the Right Choice
- Severe, acute, life-threatening depression (active suicidal behavior, refusal to eat or drink, severe psychotic depression)
- Prior favorable response to ECT
- Pregnancy (ECT is safer than most antidepressants during pregnancy)
- Catatonic presentations
- When cost coverage is a primary concern and insurance access to ECT is available
- When the patient strongly prefers a non-experiential treatment and is not troubled by memory concerns
When Ketamine May Be the Right Choice
- Rapid relief is needed but the presentation is not immediately life-threatening
- Cognitive side effects are a significant concern
- Co-occurring PTSD, anxiety, chronic pain, or addiction is present
- Prior ECT was unsuccessful, not tolerated, or is geographically inaccessible
- The patient is open to the experiential component and interested in its therapeutic potential
- Outpatient convenience is important
Can You Do Both?
Yes. Ketamine and ECT are not mutually exclusive. Some patients use ketamine to maintain remission achieved by ECT. Others try ketamine first and escalate to ECT if needed. And some patients who cannot tolerate ECT or for whom it’s inaccessible find that ketamine provides an effective alternative pathway.
At Seaside Ketamine, we hold the full landscape honestly. If we believe ECT is the more appropriate option for your specific presentation, we’ll tell you — and help you access the right referral.