How TMS Works — and Who It Helps Most
Key Takeaways
What TMS Actually Is
Transcranial magnetic stimulation is close to what the name says: stimulation of the brain, through the skull, using magnets. A coil held against your scalp by a fitted helmet delivers focused magnetic pulses to the prefrontal cortex — the mood-regulation region that runs underactive in depression. TMS has been FDA-approved for depression since 2008.1
That design matters in daily life. Nothing enters your bloodstream, so TMS doesn’t carry the weight gain, sexual side effects, or emotional blunting associated with many antidepressants. And with no sedation, there’s nothing to recover from: you’re awake the whole time and drive yourself to and from every appointment. The evidence includes large sham-controlled randomized trials.2
What a Session Feels Like
Your first visit is mapping and fitting: your provider locates the exact treatment spot, calibrates your personal stimulation dose, and adjusts the fitted helmet that holds the coil in place. Visits run about 40 minutes that first week.
After that, sessions are short and honestly a little boring — which is the point. You settle into a recliner, the technician positions the helmet, and treatment starts. The pulses feel like a firm tapping on one spot of your scalp — odd for the first few minutes, then easy to tune out. Some people feel a mild facial twitch during the pulses; it stops when they do. Most people read or chat through the session — at Bishop Health, certified TMS technician Mary Kate Fitzgerald runs every session and stays in the room throughout.
When it ends, you get up and go — work, errands, school pickup. There’s nothing to sleep off and no ride to arrange.
The Course, Week by Week
A standard course is about 36 sessions over six to nine weeks — roughly 20 minutes a day, five weekdays a week. Week one is mapping plus your first treatments. Weeks two through six are the daily rhythm, and when change tends to show up: most people notice mood shifts somewhere in weeks 2–4. Weeks seven through nine taper sessions down gradually rather than stopping abruptly, which helps results hold. Afterward, your provider tracks response and plans maintenance — booster sessions are an option if symptoms return.
Visits fit around work — many patients come before a shift or on a lunch break. Your exact protocol is set at evaluation; session counts and schedules vary by diagnosis and response.
Who TMS Helps Most
TMS tends to be a strong fit if you’ve been diagnosed with major depression, one or more antidepressants haven’t given you adequate relief — or their side effects have been hard to live with — and you’re an adult who can commit to brief weekday visits for six to nine weeks. At Bishop Health, TMS is also used for treatment-resistant depression and OCD.
It isn’t the right tool for everyone. Non-removable metal implants in or near the head rule it out, and a history of seizures gets evaluated case by case. Every TMS course starts with a psychiatric evaluation that screens for all of this — you don’t need to self-diagnose before calling.
On cost: most commercial plans — and MaineCare — cover TMS for depression after documented medication trials, and nearly every plan requires prior authorization first. Bishop Health handles that paperwork and tells you your expected out-of-pocket cost before your first treatment — not after. Self-pay pricing is available if your plan declines coverage; details are on the insurance page.
If you’re weighing TMS against Spravato — the other covered interventional option — we compared them honestly, side by side: TMS vs. Spravato vs. ketamine.
Find out if TMS is your next step
One call covers eligibility, your insurance, and scheduling an evaluation — usually within two weeks.
How to Start — and Where TMS Fits
TMS is one piece of a fuller system of care. Bishop Health’s structured day programs — the partial hospitalization program (PHP) and intensive outpatient program (IOP) — anchor care for people who need more support than weekly appointments, and TMS often runs alongside therapy and medication management rather than replacing them. Your evaluation looks at the whole picture, not just one modality.
Starting is one phone call: a free benefits check, then a psychiatric evaluation to confirm TMS is appropriate, then prior authorization — typically one to two weeks — and you begin treatment knowing your exact cost. Call Bishop Health, or start from the admissions page or the contact page.
References
- U.S. Food & Drug Administration. 510(k) clearance for transcranial magnetic stimulation in major depressive disorder (2008); expanded clearances including OCD (2018).
- George MS, et al. Daily left prefrontal transcranial magnetic stimulation therapy for major depressive disorder: a sham-controlled randomized trial. Archives of General Psychiatry. 2010;67(5):507–516.
- Perera T, et al. The Clinical TMS Society consensus review and treatment recommendations for TMS therapy for major depressive disorder. Brain Stimulation. 2016;9(3):336–346.