TMS and ECT are not the same treatment. They both use energy to stimulate the brain, and they’re both used for depression that hasn’t responded to medication, but the similarities largely end there. ECT sends electrical current through the brain to intentionally trigger a seizure under general anesthesia. TMS uses magnetic pulses to stimulate targeted brain regions while you sit awake in a chair. The differences in how they work, what they feel like, and what side effects they carry are significant.
How Each Treatment Works
ECT, or electroconvulsive therapy, places electrodes on your scalp and delivers an electrical current strong enough to cause a brief, controlled seizure lasting under a minute. The seizure itself is the treatment. You’re under general anesthesia and a muscle relaxant the entire time, so you don’t feel or physically experience the seizure. The exact reason seizures help with severe depression isn’t fully understood, but the treatment has been used since the 1930s and remains one of the most effective options for people in psychiatric crisis.
TMS, or transcranial magnetic stimulation, works completely differently. An electromagnetic coil is placed against your head, and it generates rapid magnetic pulses (about the same strength as an MRI scanner) that pass through the skull and create weak electrical currents in specific brain regions. There is no seizure. Depending on the frequency of pulses, TMS can either increase or decrease activity in the targeted area. For depression, it’s typically aimed at a region of the prefrontal cortex involved in mood regulation.
What Each Procedure Feels Like
ECT requires a hospital or specialized clinic setting. You fast beforehand, receive general anesthesia and a muscle relaxant through an IV, and are unconscious for the procedure. Afterward, you wake up in a recovery area and typically need someone to drive you home. Sessions usually happen three times per week.
TMS is performed in an outpatient office. No anesthesia, no IV, no fasting. You sit in a chair, the coil is positioned on your head, and you hear clicking sounds as the magnetic pulses fire. Each session takes roughly 20 to 40 minutes, and you can drive yourself home and return to normal activities immediately. A standard course involves daily sessions, five days a week, over several weeks.
Effectiveness for Depression
ECT is the stronger treatment. In head-to-head comparisons, ECT achieves a response rate of about 64% and a remission rate of 53%. High-frequency TMS produces a response rate of roughly 49% and remission in about 32% of patients. Low-frequency TMS, which targets a different brain region, has a notably lower response rate of around 20%.
That gap matters, but context matters too. ECT is generally reserved for the most severe cases: people with life-threatening depression, psychotic features, or situations where a rapid response is critical. TMS is typically used earlier in the treatment pathway, for people whose depression hasn’t improved after trying two or more antidepressant medications. The two treatments aren’t usually competing for the same patients at the same point in their care.
Side Effects and Memory Impact
This is one of the biggest practical differences between the two. ECT’s most well-known side effect is memory impairment. Many patients experience difficulty forming new memories around the time of treatment, and some report gaps in older memories as well. The severity varies widely, and for some people the memory effects are temporary, but for others they can persist. ECT also carries the standard risks of general anesthesia: nausea, confusion, headache, and muscle soreness after waking.
TMS side effects are considerably milder. The most common complaints are headache, twitching of facial muscles during the session, and some scalp discomfort at the stimulation site. These tend to diminish over the course of treatment. Unlike ECT, TMS has actually been shown to slightly improve cognitive function, including working memory and recall, rather than impairing it.
Maintenance After Initial Treatment
Both treatments can require ongoing “maintenance” sessions to prevent relapse after the initial course ends. For ECT, maintenance sessions are typically spaced out to once a month or once every two months. For TMS, maintenance sessions average about once every three to four weeks, though the range varies from weekly to every eight weeks depending on the individual.
Some patients who initially responded to ECT have successfully transitioned to TMS for their maintenance phase, which avoids repeated rounds of anesthesia and the cumulative memory effects that can come with long-term ECT use.
Cost and Insurance Coverage
A full course of standard TMS costs between $6,000 and $15,000 without insurance. With insurance coverage, out-of-pocket costs typically fall between $1,000 and $7,500 total, with individual session copays ranging from $50 to $250. Most insurers require a diagnosis of major depressive disorder, documented failure of at least two to four antidepressant medications, and sometimes proof of attempted psychotherapy before they’ll approve coverage.
Newer, accelerated forms of TMS are considerably more expensive. The SAINT protocol, which compresses treatment into a single week, runs $30,000 to $36,000 and is not yet covered in most outpatient settings. Theta-burst stimulation, a faster variant, costs $6,000 to $20,000 and also has limited insurance coverage.
ECT is generally covered by insurance for severe or treatment-resistant depression, though it involves additional costs for anesthesia, recovery room time, and the clinical staff required for each session. The per-session cost is higher than TMS, but the total number of sessions in an acute course is lower since ECT is administered three times per week over a shorter period rather than daily over several weeks.
Which One Is Used When
The choice between TMS and ECT isn’t really about picking one over the other. They fill different roles. TMS is a reasonable next step when antidepressants and therapy haven’t worked, your depression is moderate to severe, and you want to avoid anesthesia and cognitive side effects. It’s a lower-intensity intervention with a gentler side effect profile and a solid, if moderate, success rate.
ECT is the treatment of choice when depression is severe enough to be dangerous: when someone is actively suicidal, not eating, experiencing psychosis, or when the situation demands the fastest possible response. Its higher remission rate and rapid onset of action make it the more powerful option, but that power comes with more significant side effects and a more demanding treatment experience.