What Is Accelerated TMS and Theta Burst Stimulation (iTBS)?

Regular TMS delivers one session a day, five days a week, for about four to six weeks. Accelerated TMS delivers two or more sessions a day, compressing the course into one or two weeks. The sessions themselves are usually short theta burst sessions of about 3 to 10 minutes with rest breaks between them. The protocols vary widely between clinics, and only the SAINT® protocol has its own FDA clearance; most other accelerated schedules are off-label uses of FDA-cleared devices.

TMS devices are FDA-cleared, not approved, and clearance is specific to a protocol and indication. The only accelerated protocol cleared as such is the Magnus Neuromodulation System with SAINT® Technology (510(k) K220177, September 2022): ten iTBS sessions a day for five days with MRI-based targeting, for adults with major depressive disorder who did not improve enough on medication. Other accelerated schedules use FDA-cleared devices off-label, which is legal but means the FDA has not reviewed that schedule and insurers often do not cover it.

Not one that is FDA-cleared. No single-day TMS protocol for depression has been cleared by the FDA. Some research groups have studied delivering many sessions within one day, but these remain experimental. The shortest FDA-cleared course is SAINT®, which takes five consecutive days. If a clinic offers a one-day course, ask what evidence supports it and understand that it is an experimental, off-label schedule.

A standard intermittent theta burst (iTBS) session delivers about 600 pulses in roughly 3 minutes, compared with 37.5 minutes for the conventional 10 Hz protocol used in the THREE-D trial. Including setup and positioning, a once-daily iTBS visit usually takes about 15 to 20 minutes. In the SAINT® protocol, each session is longer, about 10 minutes, because it delivers 1,800 pulses.

The strongest evidence says yes for the once-daily schedule. The THREE-D trial randomized 414 adults with treatment-resistant depression to iTBS or 10 Hz TMS and found iTBS non-inferior, with depression scores falling by about the same amount in both groups and similar side effects. The trial compared two active treatments without a sham arm, so it shows equivalence rather than efficacy against placebo, and its results apply to once-daily treatment rather than accelerated schedules.

The side effects are the same as for standard TMS: scalp discomfort, headache, and facial twitching, which usually fade within the first days. Headache was reported by about two-thirds of participants in the THREE-D trial, and iTBS was rated slightly more painful than 10 Hz. Seizure is the most serious risk and is rare with standard parameters. Because accelerated protocols deliver many more pulses per day and have been studied in far fewer people, rare risks are less well characterized than for conventional TMS.

Cost depends on the protocol and on whether your insurance covers it. A standard once-daily course is more often covered when plan criteria are met. SAINT® uses its own Category III CPT codes, and coverage varies by plan; many patients currently self-pay. Off-label accelerated schedules are frequently not reimbursed. Neuro Wellness TMS Centers of America verifies your specific plan before treatment; see our cost and insurance page for details on codes, criteria, and what to ask.

Yes. Because the SAINT® course takes five consecutive days, patients from elsewhere in Florida and out of state do travel to Neuro Wellness TMS Centers of America in Coral Springs for treatment. Plan to arrive the day before treatment starts, stay locally for the week, and expect full days at the clinic with roughly 50-minute breaks between sessions. A pre-treatment evaluation and MRI must be completed beforehand, and a follow-up plan with your home providers should be arranged before you leave.