What Is TMS Therapy? A Plain-Language Patient Guide

TMS (transcranial magnetic stimulation) is a noninvasive treatment that uses an electromagnetic coil, held against your scalp, to send short magnetic pulses into an area of the brain involved in mood regulation. The pulses create small electrical currents that stimulate nerve cells there. It is used mainly for major depression that has not improved enough with antidepressants, and it needs no anesthesia: you are awake the whole time and can go back to your normal day afterward.

The first TMS system for depression was authorized by the FDA in October 2008. Since then, devices have been cleared for a handful of other conditions, listed below. Many other uses you may read about online, such as TMS for bipolar depression, ADHD, generalized anxiety on its own or autism, are off-label or still research-stage, and this guide says so wherever they come up.

What a magnetic pulse actually does

A TMS coil is an electromagnet. When it switches on and off very rapidly, it produces a magnetic field about as strong as an MRI scanner's, and that field passes easily through the skull. Inside the brain, the changing field induces weak electrical currents in the nerve cells directly under the coil. Repeated over many sessions, that stimulation is thought to change how mood-related brain circuits work together. Researchers are still studying exactly why it helps some people and not others.

For depression, the standard target is the left dorsolateral prefrontal cortex (DLPFC), a region near the front of the head on the left side. The TMS team sets the strength of the pulses individually, as a percentage of your "motor threshold": the strength needed to make your fingers move when the coil sits over the part of the brain that controls your hand. That measurement is one reason the first session takes longer than the rest.

There is no single agreed best way to position the coil or deliver the pulses, so protocols differ between devices and clinics.

What TMS is FDA-cleared to treat

TMS devices are "FDA-cleared" (through the 510(k) or De Novo pathways), not "FDA-approved". FDA uses "approval" for the highest-risk Class III devices, and every TMS device is Class II. Clearance still means FDA reviewed the device and its intended use. Each clearance belongs to a specific device and a specific use, which is why the details matter.

Condition	First cleared	Example device	What the label covers
Major depression, adults	2008	NeuroStar	Adults whose depression has not improved enough with antidepressant medication in the current episode
Major depression, adults (deep TMS)	2013	BrainsWay H-coil	The same group of adults, using a different coil design
Obsessive-compulsive disorder (OCD)	2018	BrainsWay H-coil	Adults, as an add-on to other OCD treatment
Smoking cessation	2020	BrainsWay H-coil	An aid to short-term quitting in adults
Depression with anxiety symptoms	2021	BrainsWay H-coil	Adults with major depression who also have anxiety symptoms
Major depression, ages 15 to 21	2024	NeuroStar, then several others	Added to (not instead of) medication
PTSD	2026	MeRT System	Adults, as an add-on treatment
Migraine	2013	Cerena, later SpringTMS	A handheld single-pulse device, not the clinic-based treatment this guide describes

Two points get garbled online. First, generalized anxiety on its own is not a cleared indication; the cleared labels cover anxiety symptoms that come with major depression. Second, bipolar depression is not FDA-cleared, even though one 2026 review reports that TMS received an FDA "breakthrough" designation for it, which is a review status rather than a clearance. For device-by-device detail, see which TMS devices are cleared, for what and at what ages, and the condition guides on TMS for OCD and TMS for anxiety.

How a course of TMS runs

A course usually starts with a psychiatric consultation to confirm the diagnosis, review past treatments and screen for safety issues such as metal in the head. The first treatment session includes finding the target and measuring your motor threshold, which is covered step by step in your first TMS session.

After that, the standard schedule is one session a day, five days a week. A 2018 expert consensus said patients should be told that a course of 20 to 30 sessions over about 6 weeks "will very likely be needed" to match the results seen in trials. One cleared label lays it out as 30 daily sessions followed by a 3-week taper, 36 sessions in all.

How long each visit takes depends on the protocol:

Standard 10 Hz TMS: FDA summaries describe sessions of 19 to 37.5 minutes, depending on the pause between pulse trains.
Theta burst (iTBS): a cleared iTBS session delivers 600 pulses in a little over 3 minutes.
Deep TMS: in the main deep TMS depression trial a session lasted about 30 minutes, about 20 of them stimulation.
Accelerated protocols: several sessions a day packed into a shorter span. SAINT gives 10 sessions a day for 5 days. Other accelerated schedules are now cleared too.

For what each week tends to feel like and when change usually shows up, see a typical TMS course, week by week and when TMS starts working. The physician's guide explains accelerated TMS in more depth.

Does TMS work? An honest look at the numbers

TMS has solid evidence for depression, but the size of the benefit depends heavily on how a study was run. Be wary of any single "TMS works for X%" figure.

The fairest comparisons are trials where some patients get a sham (fake) treatment that looks and sounds real. In the NIMH-funded trial published in 2010, 14.1% of patients on active TMS reached remission versus 5.1% on sham. In the main deep TMS trial, remission was 30.4% versus 15.8% in the intention-to-treat analysis. Sham groups improve a lot in these trials, which is part of why the gap looks modest.

Real-world clinic data look much better. A large NeuroStar registry reported response rates of 58% to 83% and remission rates of 28% to 62%, depending on the sample and the scale. But those patients knew they were getting TMS, many outcomes were self-reported, and clinics chose whether to send in data, so the figures are not directly comparable with trial results. A middle-ground summary comes from the 2023 Canadian (CANMAT) guidelines, which put TMS response rates for hard-to-treat depression at 40% to 50%.

Professional bodies take TMS seriously. The American Psychiatric Association's 2024 position statement calls it "a safe and effective evidence-based medical treatment" when given by TMS-trained psychiatrists to appropriately selected patients. CANMAT rates TMS as a first-line option for treatment-resistant depression. None of that means it will work for you, and a good TMS team will say so plainly.

Who TMS tends to suit, and when it is not the right first step

TMS is usually considered for adults with major depression who have not improved enough on antidepressants, or who cannot tolerate them. It can also be a first choice when medication side effects are a real concern, or if TMS helped you in an earlier episode. If you are not sure whether your history counts as "treatment-resistant", read what treatment-resistant depression means and the TMS candidate checklist.

TMS is usually not the right first step when:

Depression is severe with psychotic symptoms or acute suicidal thoughts. A 2018 consensus advised that these patients be considered for treatments with established efficacy in that setting, such as ECT.
This is your first treatment for depression. APA's 2010 guideline said evidence was insufficient to support TMS as the initial treatment. Therapy, medication or both usually come first.
You have metal or implants in or near your head. FDA guidance lists conductive or magnetic metal in the head, and implants such as deep brain stimulators and cochlear implants, as contraindications. Fillings and most dental work are a separate question, covered in TMS with fillings, implants or tattoos.
You have a seizure history, a head injury or another neurologic condition. FDA guidance calls for close monitoring in these situations, so they need careful evaluation first.
You have bipolar disorder. FDA guidance lists bipolar disorder among groups where evidence on efficacy and safety is lacking, so it needs specialist judgment.

If you are thinking about suicide or are in crisis, call or text 988 (the 988 Suicide & Crisis Lifeline) or go to the nearest emergency room.

Side effects, briefly

The most common side effects in trials were headache and scalp discomfort at the treatment site, usually mild and temporary. In the pivotal NeuroStar trial, 4.5% of patients stopped because of side effects. The most serious risk is a seizure. It is rare: one large survey found fewer than 1 seizure per 60,000 sessions when TMS was given within guidelines to people without known risk factors. TMS is loud, so earplugs are required. A systematic review cited by international safety guidelines found no reliable evidence of cognitive side effects across 31 randomized trials of this kind of TMS.

The full picture is in TMS side effects: common, rare and what to do, and the sensations themselves are described in what TMS feels like.

How TMS differs from antidepressant medication

An antidepressant travels through your whole body in the bloodstream, and its common side effects reflect that: upset stomach, headache or sexual side effects, for example. Antidepressants also usually take 4 to 8 weeks to work. TMS acts on one brain region and leaves nothing circulating once the session ends, so its common side effects are mostly felt at the head during treatment. The trade-off is time: daily visits for several weeks instead of a daily pill.

The two are not either-or. TMS can be given with or without antidepressants, and expert consensus found no evidence that combining them raises the risk of side effects. The adolescent clearances are specifically for use alongside medication. For help weighing the next step after one or two medicines have not worked, see TMS or another antidepressant, and for practical rules, medications during TMS.

How TMS differs from ECT

ECT (electroconvulsive therapy) passes a current through the brain under general anesthesia to cause a brief, controlled seizure. An acute course usually takes 6 to 12 sessions. TMS uses magnetic pulses instead of an electrical current, needs no anesthesia, and you can go back to your normal day afterward. In head-to-head studies ECT came out more effective overall, especially for psychotic depression; in non-psychotic depression one analysis found the two similar. ECT can affect memory, and in one community study some effects could still be detected 6 months after a course. Canadian guidelines suggest that, outside emergencies, TMS should generally be considered before ECT because it is less invasive. The physician's guide compares them in detail in TMS vs ECT.

Words you will hear in a TMS consultation

A few terms come up again and again. Knowing them makes it easier to read study results and to ask sharper questions.

Response: usually a drop of at least half in your score on a depression rating scale.
Remission: a score low enough to count as minimal or no symptoms. It is a higher bar than response, and the more meaningful one.
Sham: a fake treatment used in trials, designed to look, sound and sometimes feel like the real thing.
Motor threshold: the personal calibration point used to set the strength of your pulses.
iTBS (theta burst): a patterned form of TMS that delivers its pulses in a few minutes instead of half an hour.
Deep TMS: TMS with a differently shaped "H-coil" that reaches a broader, somewhat deeper area.
Accelerated TMS: several sessions in one day, so the course finishes in days or a couple of weeks rather than six.

The TMS glossary explains many more, from "adjunct" to "neuronavigation".

Coverage and next steps

Many health plans cover TMS for depression when specific conditions are met, but the rules differ from plan to plan and are usually checked through prior authorization before you start. Does insurance cover TMS? walks through how coverage works for New York patients.

If you are still deciding whether TMS is worth exploring, these pages are good next reads:

You can also browse the full TMS patient guide or read the TMS therapy page.

Sources

Premarket Approval (PMA). U.S. Food and Drug Administration, 2026. fda.gov
Premarket Notification 510(k). U.S. Food and Drug Administration, 2026. fda.gov
De Novo Classification Request DEN070003 (NeuroStar TMS System). U.S. Food and Drug Administration, 2008. accessdata.fda.gov
510(k) K160703: NeuroStar TMS Therapy System. U.S. Food and Drug Administration, 2016. accessdata.fda.gov
510(k) K220127: NeuroStar Advanced Therapy System. U.S. Food and Drug Administration, 2022. accessdata.fda.gov
510(k) Summary K231926: NeuroStar Advanced Therapy System. U.S. Food and Drug Administration, 2024. accessdata.fda.gov
510(k) K122288: BrainsWay Deep TMS System. U.S. Food and Drug Administration, 2013. accessdata.fda.gov
De Novo Classification Request DEN170078 (BrainsWay Deep TMS for OCD). U.S. Food and Drug Administration, 2018. accessdata.fda.gov
510(k) K200957 and K203616: BrainsWay Deep TMS for smoking cessation. U.S. Food and Drug Administration, 2020. accessdata.fda.gov
510(k) K210201: BrainsWay Deep TMS System. U.S. Food and Drug Administration, 2021. accessdata.fda.gov
510(k) Summary K251449: BrainsWay Deep TMS accelerated protocol. U.S. Food and Drug Administration, 2025. accessdata.fda.gov
510(k) Premarket Notification database records (K231926, K243869, K251125, K243700, K251391, K252358, K260691). U.S. Food and Drug Administration, 2026. accessdata.fda.gov
510(k) Summary K260189: MagVenture Accelerated TMS (aTMS) Therapy System. U.S. Food and Drug Administration, 2026. accessdata.fda.gov
510(k) K260402: Wave Neuroscience MeRT System. U.S. Food and Drug Administration, 2026. accessdata.fda.gov
De Novo Classification Request DEN130022 (Cerena Transcranial Magnetic Stimulator). U.S. Food and Drug Administration, 2013. accessdata.fda.gov
510(k) K182976: SpringTMS. U.S. Food and Drug Administration, 2019. accessdata.fda.gov
510(k) Summary K220177: Magnus Neuromodulation System with SAINT Technology. U.S. Food and Drug Administration, 2022. accessdata.fda.gov
510(k) Summary K173620: MagVita TMS Therapy System w/Theta Burst Stimulation. U.S. Food and Drug Administration, 2018. accessdata.fda.gov
Efficacy and safety of deep transcranial magnetic stimulation for major depression: a prospective multicenter randomized controlled trial. World Psychiatry, 2015. pmc.ncbi.nlm.nih.gov
Daily left prefrontal transcranial magnetic stimulation therapy for major depressive disorder: a sham-controlled randomized trial. Archives of General Psychiatry, 2010. pubmed.ncbi.nlm.nih.gov
Clinical outcomes in a large registry of patients with major depressive disorder treated with Transcranial Magnetic Stimulation. Journal of Affective Disorders, 2020. pubmed.ncbi.nlm.nih.gov
A systematic review and meta-analysis on placebo response to repetitive transcranial magnetic stimulation for depression trials. Progress in Neuro-Psychopharmacology & Biological Psychiatry, 2018. pubmed.ncbi.nlm.nih.gov
Seizures from transcranial magnetic stimulation 2012-2016: Results of a survey of active laboratories and clinics. Clinical Neurophysiology, 2019. europepmc.org
Class II Special Controls Guidance Document: Repetitive Transcranial Magnetic Stimulation (rTMS) Systems. U.S. Food and Drug Administration, 2011. fda.gov
Efficacy and safety of transcranial magnetic stimulation in the acute treatment of major depression: a multisite randomized controlled trial. Biological Psychiatry, 2007. pubmed.ncbi.nlm.nih.gov
Transcranial magnetic stimulation in the treatment of major depressive disorder: a comprehensive summary of safety experience from acute exposure, extended exposure, and during reintroduction treatment. Journal of Clinical Psychiatry, 2008. europepmc.org
Safety and recommendations for TMS use in healthy subjects and patient populations, with updates on training, ethical and regulatory issues: Expert Guidelines. Clinical Neurophysiology, 2021. europepmc.org
Efficacy, Effectiveness, and Safety of Transcranial Magnetic Stimulation for Bipolar Depression: A Systematic Review and Meta-Analysis. Biological Psychiatry Global Open Science, 2026. europepmc.org
Practice Guideline for the Treatment of Patients With Major Depressive Disorder, Third Edition. American Psychiatric Association, 2010. psychiatryonline.org
Position Statement on Transcranial Magnetic Stimulation (TMS). American Psychiatric Association, 2024. psychiatry.org
Consensus Recommendations for the Clinical Application of Repetitive Transcranial Magnetic Stimulation (rTMS) in the Treatment of Depression. Journal of Clinical Psychiatry, 2018. pmc.ncbi.nlm.nih.gov
Canadian Network for Mood and Anxiety Treatments (CANMAT) 2023 Update on Clinical Guidelines for Management of Major Depressive Disorder in Adults. Canadian Journal of Psychiatry, 2024. pmc.ncbi.nlm.nih.gov
The Clinical TMS Society Consensus Review and Treatment Recommendations for TMS Therapy for Major Depressive Disorder. Brain Stimulation, 2016. pmc.ncbi.nlm.nih.gov
The cognitive effects of electroconvulsive therapy in community settings. Neuropsychopharmacology, 2007. pubmed.ncbi.nlm.nih.gov
Repetitive transcranial magnetic stimulation versus electroconvulsive therapy for major depression: a systematic review and meta-analysis. Progress in Neuro-Psychopharmacology & Biological Psychiatry, 2014. pubmed.ncbi.nlm.nih.gov
Brain Stimulation Therapies. National Institute of Mental Health, 2024. nimh.nih.gov
Transcranial Magnetic Stimulation (TMS). Cleveland Clinic, 2026. my.clevelandclinic.org
Mental Health Medications. National Institute of Mental Health, 2023. nimh.nih.gov

FAQs

Is TMS the same as shock therapy?

No. ECT uses an electrical current under general anesthesia to cause a controlled seizure. TMS uses magnetic pulses, and you stay awake with no anesthesia.

How long is each TMS session?

It depends on the protocol: a few minutes for theta burst, roughly 20 to 40 minutes for standard or deep TMS, plus time to settle in. The first session takes longer because of mapping and motor-threshold measurement.

Can I keep working during a TMS course?

Most people can, because there is no anesthesia and you can go back to your day after a session. The main challenge is getting to daily appointments. See working, studying and driving during TMS.

Do I have to stop my antidepressant to have TMS?

Usually not. TMS can be given with or without medication, and expert consensus found no evidence that combining them increases side effects. Do not change medication without talking to your prescriber.

What happens if TMS does not help me?

Not responding to TMS does not mean nothing else will work. Your psychiatrist can review the diagnosis and other options such as different medications, esketamine, ketamine or ECT. See what if TMS does not work.

What Is TMS Therapy? A Plain-Language Guide for Patients