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Evidence and research

Does TMS Work for Treatment-Resistant Depression?

September 16, 2026 · 6 min read · By TMS Therapy New Jersey editorial team

Yes—TMS can help some adults with depression that has not improved with antidepressant treatment, and sham-controlled trials support a genuine treatment effect (O’Reardon et al.; George et al.). It does not work for everyone, and neither trial results nor clinic averages can predict an individual’s outcome.

For someone considering TMS in New Jersey, the useful question is not simply whether it works. It is what “works” means, how strong the evidence is, and how closely the people studied resemble you.

What treatment and diagnosis are we discussing?

Transcranial magnetic stimulation, or TMS, uses magnetic pulses delivered through a coil placed against the scalp. Treatment does not require surgery, and patients remain awake during sessions.

This article concerns major depressive disorder after inadequate benefit from antidepressant treatment. The FDA’s initial NeuroStar clearance covered adults with major depressive disorder who had failed to improve adequately after an adequate antidepressant trial, with the detailed indication specified in the FDA clearance document.

“Treatment-resistant depression” describes inadequate improvement despite treatment, but the term alone does not establish eligibility. A prescriber needs to review the diagnosis, prior medication doses and duration, tolerability, and current symptoms.

FDA clearance is device- and indication-specific; it is not a blanket endorsement of every TMS protocol or condition. A use outside a device’s cleared labeling is off-label. Ask whether the proposed treatment falls within that device’s FDA-cleared indication. Our guide to depression and TMS provides additional context for that conversation.

Why sham-controlled trials matter

Depression symptoms can change for reasons other than the treatment being tested. Expectations, clinical attention, and the passage of time can all complicate interpretation. A randomized, sham-controlled trial helps separate a treatment’s effects from those influences.

Participants receive either active treatment or a sham procedure intended to serve as a comparison. Researchers then compare outcomes between groups. The difference between those groups is more informative about treatment efficacy than improvement in the active group alone.

These studies nevertheless answer a bounded question: how the tested treatment performed in the enrolled population under that study’s conditions. They do not establish that every patient, device, or schedule will produce the same result.

What the pivotal trials found

The O’Reardon multisite randomized trial enrolled 301 patients. Active TMS produced significantly greater improvement in depressive symptoms and roughly double the remission rate of sham by week 6.

That finding supports an effect beyond the comparison procedure. However, “double the remission rate” is a relative comparison, not a statement that most participants recovered. Relative differences need to be read alongside absolute outcomes and the study’s assessment methods.

The independent George sham-controlled trial, a NIMH multisite study, analyzed 190 participants. Remission occurred in 14.1% of the active-treatment group versus 5.1% of the sham group.

Those percentages demonstrate both benefit and limitation: remission was more frequent with active TMS, but most participants in the active group did not meet the trial’s remission criterion. The reported odds ratio was 4.2; that is a statistical comparison of odds, not an individual patient’s probability of recovery (George et al.).

Taken together, these trials support TMS as an effective treatment for some people with depression, rather than a treatment whose apparent benefit can be explained entirely by the sham comparison. They do not support a guaranteed outcome (O’Reardon et al.; George et al.).

Response and remission are different outcomes

A response means a substantial reduction in symptoms from the starting point. A remission means symptoms have fallen below a defined threshold on the assessment being used. Neither term necessarily means that all difficulties have disappeared or that improvement will last indefinitely.

The distinction matters in daily life. Someone may experience meaningful improvement in mood and functioning while still having important symptoms. Another person may meet a scale’s remission threshold but still need help rebuilding routines and relationships.

When you encounter an outcome percentage, ask:

  • Was the outcome response, remission, or any improvement?
  • Which symptom scale and cutoff were used?
  • Was the rating completed by a clinician or the patient?
  • When was the outcome measured?
  • Did the calculation include everyone who started treatment?

These are not technical distractions. They determine what a headline result actually tells you. An acute-treatment remission rate also does not establish how long that remission lasts.

How real-world outcomes compare

The Carpenter naturalistic outcomes study followed 307 outpatients receiving TMS at 42 US practices. It reported a clinical response rate of 58.0% and a remission rate of 37.1% in routine care.

Those findings offer a useful view of treatment outside a tightly controlled trial. The reported remission rate was higher than the active-treatment remission rate in the George trial, but that is not a head-to-head comparison (Carpenter et al.; George et al.).

The Carpenter study was observational, not randomized and sham-controlled. It describes what happened in clinical practice, but cannot isolate how much improvement was attributable to TMS itself rather than other influences (Carpenter et al.).

Differences in patient selection, treatment delivery, concurrent care, outcome measures, and assessment timing can complicate comparisons between studies. Higher clinic rates should therefore not be presented as proof that routine care is more effective than trial treatment.

The evidence types are complementary: controlled trials help establish efficacy, while observational studies describe outcomes in everyday practice. Neither provides a personalized forecast.

What clinic outcome claims should explain

A clinic’s results can be informative only if the clinic explains how they were calculated. A high success rate without a definition of success is difficult to interpret.

Ask whether the clinic uses standardized symptom assessments, reports response separately from remission, and includes patients who stop early. Also ask whether its figures represent outcomes immediately after treatment or later follow-up.

Effectiveness is separate from tolerability. In the O’Reardon trial, 4.5% discontinued because of side effects; that number is not the percentage who experienced any side effect (O’Reardon et al.). A consultation should cover possible adverse effects, safety screening, and reasons treatment might need adjustment or discontinuation.

Bringing the evidence to a New Jersey consultation

A prescriber can put these findings in context by reviewing your treatment history, current condition, and goals. Useful questions include what improvement would look like for you, how symptoms would be tracked, and when progress would be reviewed.

If you are comparing options near Princeton or Jersey City, consider travel and appointment logistics alongside clinical information. You can find New Jersey TMS providers and ask about their assessment process without assuming that proximity or promotional outcome figures establish clinical suitability.

Coverage is a separate issue from effectiveness and FDA-cleared eligibility. Review TMS insurance considerations and confirm your plan’s requirements directly. The purpose of a consultation is to clarify fit, uncertainties, and alternatives—not to turn a published average into a promise.

References

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