A standard course of TMS (transcranial magnetic stimulation) for depression involves 36 total sessions, delivered five days a week over roughly six weeks. That’s the FDA-cleared protocol, though the exact number can vary depending on the condition being treated, the type of TMS technology used, and how you respond along the way.
The Standard 36-Session Protocol for Depression
The 36-session number comes from the clinical trials that led to FDA clearance. Early trial endpoints were assessed after just 15 to 20 sessions (three to four weeks at five sessions per week), but continuing treatment beyond that point consistently produced better results. That additional treatment time is why the full protocol was set at 36 sessions rather than stopping at the initial improvement window.
Each session is scheduled once per day, Monday through Friday, in an outpatient clinic. You don’t need anesthesia or sedation, so you can drive yourself and return to normal activities immediately. A single session typically lasts 20 to 50 minutes with standard repetitive TMS, though newer machines using a technique called theta burst stimulation can finish in about 10 minutes or less while delivering comparable results.
When You Can Expect to Feel a Difference
TMS isn’t like a medication that kicks in after a set number of days. Improvement tends to build gradually over the course of treatment, and the timeline varies from person to person.
During the first one to two weeks (sessions 5 through 10), a small number of people notice subtle shifts: a slight lift in mood, a bit more energy, or feeling less emotionally reactive than usual. By weeks three and four (sessions 15 to 20), more noticeable changes tend to emerge, like better sleep, renewed interest in socializing, or an easier time getting through daily tasks. The most significant gains typically come toward the end of the full course, around weeks five and six. By that point, roughly 50% of patients report substantial symptom relief, and about 30% reach full remission.
If you’re in the early weeks and feel nothing yet, that’s common and doesn’t mean it won’t work. The cumulative nature of TMS means the later sessions build on the neural changes from earlier ones.
Session Counts for OCD and Smoking Cessation
Depression is the most common reason people get TMS, but the FDA has also cleared it for obsessive-compulsive disorder and smoking cessation, each with a different protocol.
For OCD, the standard FDA-approved protocol involves five sessions per week for six weeks, similar to depression. Each session is shorter, at about 18 minutes of stimulation. The total comes to around 30 sessions.
For smoking cessation, the protocol is 18 sessions spread over six weeks, with each session lasting 25 to 30 minutes. That’s a lower frequency than the depression protocol, meaning you won’t go in every weekday for the full six weeks.
Accelerated and Shorter Protocols
Newer approaches are compressing the standard six-week timeline dramatically. Accelerated protocols deliver multiple sessions per day over a single week instead of one session per day over six weeks. One well-studied approach uses theta burst stimulation with 1,200 pulses per session, five sessions per day, for five consecutive days. That’s 25 sessions in one week, and research shows it produces symptom improvement comparable to the standard four-week schedule.
These accelerated options are especially appealing if taking six weeks of daily appointments feels unmanageable. Not every clinic offers them yet, and insurance coverage for compressed protocols can be inconsistent, but availability is expanding.
Tapering After the Acute Course
Some clinics add a tapering phase after the initial 36 sessions rather than stopping abruptly. This typically involves reducing the frequency to one or two sessions per week over the final three weeks of treatment. In large patient registries, about 12% of patients followed a strict taper of one to two sessions per week, while another 17% followed a looser taper of slightly more frequent visits. The goal is to consolidate the gains from the acute phase and ease the transition off treatment.
Whether your provider includes a taper depends on your response and their clinical approach. It’s worth asking about before you start so you know the full expected commitment.
What Insurance Typically Covers
Medicare considers TMS medically reasonable and necessary for up to six weeks of daily treatment for severe major depressive disorder. That aligns neatly with the 36-session standard protocol. Most major private insurers follow a similar framework, though specific requirements vary. Some require documentation that you’ve tried a certain number of medications without adequate relief before they’ll approve TMS.
If your symptoms return months or years after a successful course, retreatment is possible. A second round typically follows the same 36-session structure, though some people respond faster the second time. Insurance approval for retreatment usually requires evidence that you responded well to the first course and that your symptoms have meaningfully returned.
How Long Each Session Takes Out of Your Day
The in-chair time for a standard repetitive TMS session is 20 to 50 minutes, depending on the specific protocol and machine your clinic uses. With theta burst stimulation, that drops to around 10 minutes or less. Factor in a few minutes for setup (positioning the coil, confirming the treatment target) and you’re looking at roughly 30 minutes to an hour per visit for standard TMS, or 20 to 30 minutes for theta burst.
There’s no recovery period afterward. You won’t feel groggy or impaired, so most people schedule sessions before work, during a lunch break, or between other commitments. Over 36 sessions, that daily time commitment adds up, which is why understanding the full scope before you start helps you plan realistically.