Key takeaways
- TMS (transcranial magnetic stimulation) is an FDA-cleared, non-invasive treatment for depression that has not responded to medication.
- It uses magnetic pulses to stimulate a region of the brain involved in mood. There is no anesthesia and no sedation.
- A typical course runs five days a week for roughly six weeks, and most people drive themselves to and from each session.
- Many insurance plans cover it, including MO HealthNet in qualifying cases, usually after you have tried antidepressants and often with prior authorization.
When people first hear the words "magnetic stimulation of the brain," they tend to picture something far more dramatic than what TMS actually is. It is one of the calmer treatments in mental health care: you sit in a chair, awake, and go home and drive yourself afterward. If a doctor has raised TMS with you, or you found it while searching for what to do after antidepressants did not work, this guide explains what it is, what a session feels like, who it tends to help, and how Missourians pay for it.
What TMS actually is
TMS stands for transcranial magnetic stimulation. A device holds a magnetic coil against the side of your head, and it delivers short, repetitive magnetic pulses to the dorsolateral prefrontal cortex, a region on the surface of the brain that is involved in mood regulation and tends to be underactive in depression. The pulses are the same type of magnetic field used in an MRI, and they gently stimulate nerve cells in that area. It is sometimes written as rTMS, where the "r" stands for repetitive.
Two words matter here: non-invasive and non-systemic. Nothing is implanted, nothing is swallowed, and no medication enters your bloodstream, which is why TMS avoids the weight gain, sexual side effects, and grogginess that lead some people to stop taking antidepressants. It is not the same thing as electroconvulsive therapy (ECT); TMS uses no anesthesia, causes no seizure, and does not affect memory.
What a session actually feels like
The first appointment is longer because the clinician maps your head to find the right spot and the right dose, called your motor threshold. After that, sessions are short and routine. Here is the general shape of one.
- You sit in a chair, awake and alert, and can rest, listen to something, or just sit quietly.
- The coil rests against your scalp and delivers pulses in bursts, usually a few seconds on and a short pause, for the length of the session.
- You feel a tapping or knocking sensation on your head and hear a clicking sound, which is why you are given earplugs.
- There is no sedation, so when it is over you get up, drive yourself, and go back to work or your day.
Newer protocols, sometimes called express or theta-burst TMS, can shorten each session to just a few minutes while a standard session runs closer to twenty to forty. Your clinic will tell you which one they use.
Who TMS tends to help
TMS is designed for people whose depression has not improved enough after one or more antidepressant trials, which is the same treatment-resistant depression that leads doctors to consider Spravato. It is a strong fit for people who cannot tolerate the side effects of medication, or who simply want an option that does not involve another pill. Because it is non-systemic, it is often considered for people who are wary of drug interactions.
Side effects are usually mild. The most common are scalp discomfort or a headache during the first week, which typically fades as you get used to it. The one serious risk, a seizure, is very rare, and clinics screen for the factors that would raise that risk, which is part of why the treatment is delivered in a supervised medical setting rather than at home.
How to pay for TMS in Missouri
Cost is the question most people reach next, and the news is more encouraging than they expect. TMS for treatment-resistant depression is widely covered by commercial insurance and, in qualifying cases, by MO HealthNet, Missouri's Medicaid program. Coverage almost always comes with conditions: plans generally require that you have already tried one or more antidepressants without enough relief, and they usually require prior authorization before the course begins. A clinic that provides TMS regularly will document that you meet the criteria and handle most of that paperwork with you. The practical move is to call, confirm your plan is accepted, and ask them to verify your benefits before you start, so there are no surprises.
For the bigger picture on how coverage works across MO HealthNet, commercial insurance, and sliding-scale clinics, see our guide on paying for depression treatment in Missouri.
Brain Recovery Centers
St. Charles County, Missouri - serving greater St. Louis
Brain Recovery Centers is a doctor-supervised clinic in the St. Louis area that offers TMS and Spravato (esketamine) for treatment-resistant depression and PTSD. They accept most insurance, including MO HealthNet, and can verify your benefits and handle prior authorization. If you are weighing TMS locally, they are a reasonable clinic to call.
Visit Brain Recovery CentersDisclosure: Brain Recovery Centers is a recommended partner of this site. Confirm coverage and treatment fit with the clinic and your own doctor.