TMS vs ECT: Comparing Two Brain Stimulation Treatments

The short answer

ECT is more effective for the most severe, psychotic or life-threatening depression, but requires general anesthesia and causes memory side effects. TMS is less powerful but has no anesthesia, no memory loss and no downtime, and works for most people with treatment-resistant depression. Most psychiatrists try TMS first unless the situation is urgent.

TMS and ECT are the two established brain stimulation treatments for depression, and they get confused constantly. Patients arrive worried that TMS is "shock therapy" and that they will lose their memory. Others arrive assuming ECT is obsolete and are surprised to hear a psychiatrist recommend it. Neither picture is right. The two treatments share a goal and little else.

What each one is

Electroconvulsive therapy (ECT) induces a brief, controlled seizure in the brain using a small electrical current delivered through electrodes on the scalp. It is done under general anesthesia with a muscle relaxant, so the patient is asleep and does not move. A course is typically six to twelve treatments, two or three times a week, in a hospital or surgical center. ECT has been used since the 1930s, has been refined enormously since, and remains the most effective acute treatment for severe depression that medicine has.

Transcranial magnetic stimulation (TMS) uses magnetic pulses from a coil held against the scalp to stimulate a specific region of the prefrontal cortex. There is no seizure, no anesthesia and no sedation. The patient is awake in a chair for about 20 minutes, then leaves. A course is 36 sessions over six to nine weeks in an outpatient office. The first TMS device was FDA-cleared in 2008, and Deep TMS in 2013.

Side by side

Feature	TMS	ECT
Mechanism	Focused magnetic stimulation of prefrontal cortex	Generalized seizure induced by electrical current
Anesthesia	None	General anesthesia with muscle relaxant
Setting	Outpatient office	Hospital or ambulatory surgery setting
Session length	About 20 minutes	About 1 to 2 hours including recovery
Course	36 sessions over 6 to 9 weeks	6 to 12 treatments over 2 to 4 weeks
Driving	Yes, immediately	No driving during the course
Memory side effects	None	Common; usually temporary, sometimes persistent for events around treatment
Remission rate (treatment-resistant depression)	About 30 to 40 percent	About 50 to 70 percent; higher in psychotic depression
Speed of response	3 to 6 weeks	1 to 3 weeks
Relapse without maintenance	Moderate	High; maintenance ECT or medication usually needed
FDA status	Cleared devices	Cleared devices; regulated for specific uses
Who it suits	Moderate to severe depression after medication failure; OCD	Severe, psychotic, catatonic or suicidal depression; when eating or drinking has stopped

Effectiveness: ECT wins on power

There is no way around this: ECT is the more effective treatment for severe depression. Meta-analyses and decades of clinical experience put remission rates for ECT in treatment-resistant depression at 50 to 70 percent, and in depression with psychotic features, where antidepressants alone do poorly, ECT can exceed 80 percent. It also works faster, often within the first week or two.

TMS, by comparison, produces remission in about a third of treatment-resistant patients and response in about half to two thirds. That is a strong result for an outpatient treatment with minimal side effects, and it beats another medication trial at the same stage, but it is not ECT.

Direct comparisons bear this out. Trials that randomized patients to TMS or ECT generally found ECT superior on remission, with the gap largest in the most severely ill and smallest in moderate, non-psychotic depression. For that middle group, some comparisons found the two closer than expected.

Side effects: TMS wins decisively

ECT's main side effects are cognitive. Confusion right after each treatment is universal and clears within an hour. Memory problems during the course are common: difficulty forming new memories and gaps for events in the weeks around treatment. For most patients this resolves within weeks to a few months after the course ends. A minority report persistent gaps for personal events from the treatment period, and a smaller minority report more lasting effects. Modern techniques, including right unilateral electrode placement and ultra-brief pulse width, have substantially reduced cognitive side effects compared with older bilateral methods, but they have not eliminated them.

ECT also carries the risks of general anesthesia, which are low in healthy patients and higher in those with cardiac disease. Headache, muscle soreness and nausea after treatment are common and short-lived.

TMS side effects are scalp discomfort and headache in the first week, which fade, and a rare risk of seizure (under one in a thousand). There is no effect on memory or cognition; trials that tested it found none. There is no anesthesia, no recovery room and no restriction on driving or working.

Practical burden

ECT requires a driver for every treatment, no driving for the duration of the course, time off work, and often a medical workup including labs, an ECG and an anesthesia consultation. Many patients receive it as inpatients. Treatments are two or three times a week for two to four weeks.

TMS requires 30 weekday visits over six weeks plus a six-session taper, each about half an hour door to door, with no workup beyond a psychiatric evaluation and a safety screen. Most patients keep working. The daily commitment is the main complaint.

Durability

Relapse after ECT is the treatment's known weakness. Without continuation treatment, half or more of patients relapse within six months. Standard practice is to continue medication, often a combination that was not tried before, or to taper ECT gradually as maintenance. TMS responses last longer on average; roughly two thirds of responders remain well at one year, often with medication, and re-treatment works well for those who relapse. Our article on how long TMS lasts covers this in detail.

When a psychiatrist recommends ECT

Depression with psychotic features (delusions or hallucinations).
Catatonia.
Acute suicidality that cannot wait six weeks for TMS or another medication trial.
Refusal to eat or drink, with medical deterioration.
Pregnancy with severe depression, where ECT has a long safety record and avoids medication exposure.
Prior excellent response to ECT.
Failure of TMS, Spravato and multiple medication combinations.

When a psychiatrist recommends TMS

Moderate to severe major depression after two or more failed antidepressants, without psychosis or urgent danger.
Intolerance of medication side effects.
Strong preference to avoid anesthesia and any memory risk.
Need to keep working and driving during treatment.
OCD that has not responded to medication and ERP therapy, using Deep TMS.

Can you do both?

Yes, in either order. TMS is often tried first because it is gentler; if it fails, ECT remains available. Patients who have responded to ECT and relapsed sometimes use TMS as a maintenance strategy to avoid repeated anesthesia. The two do not interfere with each other.

Where to get each one

Stedfast Psychiatry offers Deep TMS at our Palm Beach Gardens office and Spravato at three Palm Beach County offices. We do not perform ECT, which is a hospital-based procedure, but when ECT is the right treatment we refer to and coordinate with hospital programs in Florida and South Carolina, and we resume care afterward.

Bottom line

ECT is the stronger treatment and the right one for the sickest patients. TMS is the gentler treatment and the right one for most people with treatment-resistant depression who are safe to wait a few weeks. They are not competitors so much as different tools for different levels of severity, and a psychiatrist's job is to match the tool to the situation.

Frequently asked questions

Is TMS the same as shock therapy?

No. "Shock therapy" refers to ECT, which induces a seizure under anesthesia. TMS uses magnetic pulses on a specific brain region while you are awake, with no seizure, no anesthesia and no memory side effects.

Which is more effective, TMS or ECT?

ECT. Remission rates for ECT in severe or treatment-resistant depression are around 50 to 70 percent, versus roughly one third for TMS. The gap is largest in psychotic and very severe depression and smallest in moderate depression, where TMS is usually tried first because of its milder side effects.

Does ECT cause permanent memory loss?

Most memory effects resolve within weeks to months after the course. Some patients have lasting gaps for events around the treatment period. Modern techniques such as right unilateral placement and ultra-brief pulses have reduced these effects considerably, but they have not eliminated them.

Can I have TMS if ECT did not work?

Yes, though response rates to TMS are somewhat lower in people who have not responded to ECT. Spravato is another option in that situation. A psychiatrist will review your full history before recommending the next step.