TMS Therapy for Treatment-Resistant Depression
Transcranial Magnetic Stimulation (TMS) is an FDA-cleared, non-invasive treatment that uses targeted magnetic pulses to stimulate the brain regions involved in mood regulation. It requires no anaesthesia and no sedation, you remain awake and can drive yourself home afterwards, and it does not carry the systemic side effects that come with medication — no weight gain, no sexual side effects, no daily dosing.
It exists for a specific situation: depression that has not responded adequately to antidepressant medication. If that describes where you are, the next step is a conversation rather than a decision. Ask us and we will assess whether TMS is an appropriate option for you, and what accessing it would involve.
How TMS works
An electromagnetic coil is positioned against your scalp, over the left dorsolateral prefrontal cortex — an area that is consistently underactive in depression. The coil delivers brief, focused magnetic pulses that induce small electrical currents in the tissue beneath it, prompting the neurons there to fire.
Repeated across a course of sessions, that stimulation appears to strengthen activity in the circuits connecting the prefrontal cortex to the deeper structures that regulate mood. The pulses reach only a few centimetres in, so the effect is regional rather than systemic. That is why the side-effect profile looks so different from a tablet that circulates through your entire body.
Two things TMS is not: it is not electroconvulsive therapy (ECT), which induces a seizure under general anaesthesia, and it is not a form of medication. Comparisons between the two are common online and largely unhelpful — they are different treatments for different points on the severity scale.
Who TMS is for
TMS is typically considered when:
- At least one adequate antidepressant trial has failed — meaning a therapeutic dose taken for a sufficient period, not a fortnight abandoned early. Most insurers require documentation of one or more trials before authorising treatment.
- Medication side effects are intolerable, or ruled out for medical reasons.
- You would rather not take a daily medication, and have a presentation where a non-pharmacological option is realistic.
- You are pregnant or planning pregnancy and want to weigh options that do not involve systemic medication exposure. This needs individual assessment, and it is a conversation worth having early.
TMS also has FDA clearance for obsessive-compulsive disorder and for smoking cessation, using different stimulation protocols and coil positions than the depression protocol.
It is not appropriate for everyone. Ferromagnetic metal in or near the head — certain aneurysm clips, cochlear implants, some stents or shrapnel — is a contraindication, as is an implanted device such as a deep brain stimulator. A history of seizures or epilepsy requires careful evaluation, since seizure is the treatment's rare but serious risk. Nor is TMS the right first move in an acute crisis: if you are actively suicidal, in a manic episode or experiencing psychosis, the priority is urgent care and stabilisation. A full psychiatric evaluation is how these questions get answered properly.
What a course of treatment looks like
TMS asks more of your calendar than most treatments, and that is the honest headline. A standard depression course runs:
- Five sessions a week, for four to six weeks, followed by a tapering set of sessions — around 30 to 36 in total.
- Roughly 20 to 40 minutes per session, depending on the protocol. Accelerated and theta-burst protocols compress the stimulation into shorter sessions.
- No recovery time. You sit in a chair, awake, and resume your day immediately afterwards. Many people book sessions before work.
The first session is longer, because it includes mapping: your clinician determines your motor threshold — the pulse intensity that produces a small twitch in your hand — and uses it to set your treatment dose, then locates the treatment target. That calibration is individual to you.
Response tends to be gradual. Some people notice change in the second or third week; for others it arrives later in the course, and family members sometimes notice before the patient does. It is worth deciding in advance, with your clinician, how response will be measured, so the judgement at the end of the course is based on something more than impression.
Side effects and safety
The common side effects are local and usually settle within the first week as you acclimatise:
- Scalp discomfort at the treatment site — the most frequently reported effect, often described as tapping or pinching.
- Headache, generally mild and responsive to ordinary analgesia.
- Facial or jaw twitching during stimulation, which stops when the pulses stop.
- Lightheadedness immediately afterwards in some people.
Hearing protection is worn throughout, because the coil produces a loud clicking sound.
The serious risk is seizure, which is rare — and rarer still with proper screening, since the screening exists precisely to identify the people at elevated risk. There is also a theoretical risk of triggering mania in someone with an undiagnosed bipolar-spectrum illness, which is one of several reasons a careful diagnostic assessment precedes treatment rather than following it.
What TMS does not do: it does not cause the memory effects associated with ECT, it does not require anaesthesia, and it does not carry the metabolic, sexual or withdrawal effects associated with antidepressant medication.
TMS, ketamine or medication — how the options compare
Patients who arrive asking about TMS are usually weighing it against something else. In broad terms:
- TMS works gradually over four to six weeks of near-daily sessions, is FDA-cleared for depression, is commonly covered by insurance after documented medication failure, and involves no sedation or recovery time. Its cost is your time.
- Ketamine and ketamine-assisted therapy act through a different mechanism and much faster — often within hours to days — with fewer total appointments, but each session requires monitoring and a period of recovery before you leave, and coverage varies considerably. Spravato, the esketamine nasal spray, is FDA-approved for treatment-resistant depression and is administered under observation.
- Medication remains the most accessible and best-studied option, and for many people a well-managed trial is all that is needed. TMS is what comes after that has been tried properly.
These are not mutually exclusive. Most people receiving TMS continue their medication and their therapy through the course; TMS is added to a plan rather than substituted for one. Which combination fits depends on your history, your diagnosis, your insurance and how much of your week you can commit — which is exactly the ground a consultation covers.
Insurance and coverage
Most major insurance plans cover TMS for treatment-resistant depression once a patient has failed at least one adequate trial of antidepressant medication, and Medicare and many Medicaid plans provide coverage as well. Coverage almost always requires prior authorisation, and the criteria differ between plans — the number of documented medication trials, whether a trial of psychotherapy is required, and the diagnostic codes accepted.
What that means practically is that the paperwork matters. Our team handles the authorisation process, including assembling the treatment history your plan requires. What we cannot do is promise a particular plan's decision in advance, and we will tell you what we know about your coverage before you commit rather than after.
If you would like the specifics for your own plan, ask us and we will look at it with you. Our out-of-network guide explains how reimbursement generally works if your psychiatric care sits outside your plan's network.
How to find out whether TMS is right for you
There is no way to answer that from a web page, and any site that tells you otherwise is guessing. The sequence is:
- Get in touch and tell us briefly what you have tried.
- A psychiatric evaluation, which establishes the diagnosis, reviews your medication history in enough detail to know whether trials were adequate, and screens for the contraindications above.
- A recommendation, which may be TMS, may be a different treatment, and may be that something correctable has been missed — an untreated sleep disorder, a thyroid abnormality, heavy alcohol use — that would limit any treatment's effect. Our integrative psychiatry assessment is built to catch exactly that.
- If TMS is appropriate, we handle insurance authorisation and coordinate your treatment course.
Depression that has not responded to two or three medications is not a dead end, and it is not a sign that you are treatment-resistant in some permanent sense. It usually means the plan has not yet been matched to the problem.
Frequently asked questions
What is TMS therapy and how does it work?
Transcranial Magnetic Stimulation is an FDA-cleared, non-invasive treatment that uses targeted magnetic pulses to stimulate underactive brain regions involved in mood regulation. It requires no anaesthesia and no medication, and the most common side effect is mild scalp discomfort. Treatment is delivered in a chair while you are awake, and you can drive yourself home afterwards.
How long does a course of TMS take?
A standard depression course is five sessions a week for four to six weeks, plus a taper — around 30 to 36 sessions in total. Each session runs roughly 20 to 40 minutes depending on the protocol, with no recovery time, so most people schedule around work.
Does insurance cover TMS therapy?
Most major plans cover TMS for treatment-resistant depression after a patient has failed at least one adequate trial of antidepressant medication, and Medicare and many Medicaid plans also provide coverage. Prior authorisation is almost always required and criteria vary by plan; our team handles that process and will tell you what we know about your coverage before you commit.
What is the difference between TMS and ketamine therapy?
TMS uses magnetic pulses to stimulate brain circuits over four to six weeks and requires no sedation or recovery time. Ketamine works through rapid neurochemical change, with effects often felt within hours, but each session requires monitoring and recovery before you leave. TMS is more consistently covered by insurance; ketamine needs fewer appointments. Which fits depends on your history, your diagnosis and your schedule.
Is TMS the same as electroconvulsive therapy?
No. ECT induces a brief seizure under general anaesthesia and is used for severe, often life-threatening depression. TMS delivers focused magnetic pulses while you are awake, induces no seizure, requires no anaesthesia, and does not cause the memory effects associated with ECT.
Who should not have TMS?
TMS is contraindicated for people with ferromagnetic metal in or near the head — certain aneurysm clips, cochlear implants, some stents or shrapnel — or an implanted device such as a deep brain stimulator. A history of seizures or epilepsy requires careful evaluation. It is also not the right first step during an acute crisis, where urgent care and stabilisation come first.
How quickly will I know if TMS is working?
Response is usually gradual. Some people notice change in the second or third week, others later in the course, and family members sometimes notice before the patient does. It is worth agreeing with your clinician in advance how response will be measured, so the decision at the end of the course rests on more than impression.