What Is Transcranial Magnetic Stimulation? How TMS Targets Depression Without Medication

Transcranial magnetic stimulation has been FDA-cleared for depression since 2008, yet it remains one of the least understood tools in psychiatry — not because the evidence is weak, but because the mechanism is genuinely unfamiliar to most patients. Understanding what TMS actually does, and why it works for patients who have not responded to medication, is the starting point for deciding whether it is worth exploring.

The Mechanism: What Magnetic Pulses Do to the Brain

Transcranial magnetic stimulation — TMS — delivers focused electromagnetic pulses to specific regions of the brain through a coil placed near the scalp. The technology is non-invasive: it does not break the skin, does not require anesthesia, and does not involve any medication entering the body. The magnetic field generated by the coil passes through the skull and induces small electrical currents in targeted brain tissue, activating neurons in regions that are underactive in patients with depression.

This is a categorically different mechanism from antidepressant medication. SSRIs and SNRIs — the standard first-line drugs for depression — work by adjusting neurotransmitter availability in the bloodstream and throughout the central nervous system. TMS acts directly on the neural circuitry itself, stimulating specific brain regions without the systemic effects that come with pharmacological treatment. For patients who have experienced significant side effects from medication, or who have not responded to it, this distinction is clinically meaningful.

The effects of TMS extend beyond the stimulation period. Research demonstrates that TMS promotes neuroplasticity — the brain’s capacity to form and strengthen neural connections — which is one of the reasons antidepressant benefits can persist well after a treatment course ends (National Center for Biotechnology Information). It is not simply producing a temporary shift in brain activity; it is helping the brain reorganize in ways that support sustained mood regulation.

What the Research Shows

TMS’s evidence base is substantial. Its FDA clearance history and clinical validation have been documented across independent peer-reviewed studies, establishing it as an evidence-backed treatment with a well-characterized profile (National Center for Biotechnology Information). Two in three patients who complete a standard TMS course report remission of their depression symptoms — a figure drawn from clinical outcome data in patients who had already tried antidepressants without adequate relief.

Research on deep TMS — a technology that reaches deeper brain structures using a specialized coil — supports FDA clearances for both depression and OCD, expanding the clinical applications of the approach beyond standard TMS (National Center for Biotechnology Information). At Cohen & Associates, we use the NeuroStar Advanced Therapy System, which carries FDA clearance for the full range of approved indications: major depressive disorder in adults, anxious depression, OCD, and major depressive disorder in adolescents ages 15 to 21.

Results vary by individual, and TMS does not produce remission in every patient. We discuss the evidence honestly and in the context of each patient’s specific history.

How Precision TMS Differs from Standard Delivery

Not all TMS is equivalent. The accuracy of coil placement — the precision with which magnetic pulses are directed at the target brain region — affects treatment consistency. At Cohen & Associates, we use visor2™ neuronavigation technology alongside the NeuroStar system, which allows our team to more exactly target pulse delivery, with or without MRI assistance. We are the only practice in the Sarasota region offering this neuronavigated, precision-based approach.

Our TMS program is led by Samantha Hagan, our TMS coordinator and technician, who has trained on multiple TMS devices and previously served as a corporate trainer for two TMS organizations. The person operating the equipment matters — the clinical benefit of precision targeting is only realized if the delivery is consistent across sessions, and that consistency depends on technical expertise.

Dr. Rebecca Cohen, our interventional psychiatrist and nationally recognized TMS specialist, oversees the clinical direction of our TMS program. A physician’s involvement in treatment planning and outcome monitoring is part of how we operate.

What a TMS Course Involves

The standard TMS course is six weeks of sessions delivered five days per week — approximately thirty sessions total. At our practice, individual sessions run in as little as three minutes for some protocols, with a range of three to twenty minutes depending on the treatment plan. You are fully awake throughout. No sedation, no anesthesia, no restrictions on driving or daily activity after each appointment.

The most commonly reported side effect is a tapping or tingling sensation at the treatment site during sessions. This typically resolves within the first week (National Institute of Mental Health). There is no systemic medication burden — no weight changes, no sexual side effects, no withdrawal process when the course concludes. For patients who have had to stop antidepressants due to tolerability, that side effect profile is often one of the most relevant features of TMS.

Most patients begin noticing changes within the first two to three weeks of treatment. The full benefit typically becomes clear by the end of the course.

Addressing Fear of the Unknown

For many patients, the primary barrier to TMS is unfamiliarity. Psychiatric treatments that involve any kind of device or procedure can feel more daunting than taking a pill, even when the actual experience is less demanding. The comparison to shock therapy — electroconvulsive therapy, or ECT — comes up frequently, and it is worth addressing directly. ECT involves inducing a seizure under general anesthesia. TMS involves no seizure induction, no anesthesia, and no cognitive side effects. The two treatments share only a general category of brain stimulation treatments; they are not similar in mechanism, experience, or side effect profile.

The other common barrier is uncertainty about cost. Coverage for TMS varies by insurance plan and clinical presentation. Because we operate a direct-care practice, the insurance process works differently here than at an in-network provider — our team verifies your specific coverage before treatment begins and walks you through the financial picture before any commitment is made. For patients without applicable coverage, self-pay options are available and discussed during the consultation.

FAQ

Is TMS painful?

Most patients describe TMS as painless or mildly uncomfortable, particularly in the first few sessions. The tapping sensation at the treatment site diminishes for most patients after the first week. No anesthesia is required before, during, or after sessions.

How is transcranial magnetic stimulation different from electroconvulsive therapy?

ECT uses electrical current to induce a controlled seizure under general anesthesia. TMS uses magnetic pulses that do not induce seizures, require no anesthesia, and carry no associated memory impairment. They are both categorized as brain stimulation treatments, but the mechanisms and patient experiences are entirely different.

Can I get TMS if I have a pacemaker or metal implants?

TMS is not appropriate for patients with non-removable conductive metal in or near the head — this includes certain types of implants, cochlear devices, and some surgical clips. A standard medical screening at your evaluation will identify any contraindications. Pacemakers in the chest are not necessarily disqualifying; the specific location and type of any implant is what matters.

How long do TMS results last?

Many patients maintain improvement well beyond the end of their treatment course. Some return for maintenance sessions if symptoms begin to re-emerge over time. How durable the response is varies by individual, and your provider will discuss what ongoing support looks like based on your treatment response.

Does TMS work for conditions other than depression?

TMS is FDA-cleared for major depressive disorder, anxious depression, OCD, and adolescent depression (ages 15–21) at our practice. Research has explored TMS for other conditions, but we offer it only for its cleared indications. Discuss your specific diagnosis and presentation with our team to explore your options.

Key Takeaways

• Transcranial magnetic stimulation uses targeted electromagnetic pulses to stimulate underactive brain regions involved in depression — no medication, no anesthesia, no systemic side effects.
• TMS promotes neuroplasticity, which helps explain why benefits often persist well beyond the treatment course itself.
• Cohen & Associates is the only practice in the Sarasota region offering neuronavigated, precision-based TMS using the NeuroStar system and visor2™ technology.
• The standard treatment course is six weeks of daily sessions; individual sessions run three to twenty minutes, with no restriction on daily activity afterward.
• Results vary by individual; a new patient evaluation is the starting point for determining whether TMS is appropriate for your specific presentation.

For patients who want to understand what transcranial magnetic stimulation actually involves before deciding whether to pursue it, the honest answer is: less than most people expect, with a side effect profile that compares favorably to most psychiatric medications. At Cohen & Associates, we are glad to walk through the clinical picture in detail during a new patient evaluation. Call us at 941-559-8500 or use our online contact form to schedule an appointment.

References

1. National Center for Biotechnology Information. TMS therapy and neuroplasticity. https://pmc.ncbi.nlm.nih.gov/articles/PMC9313265/
2. National Center for Biotechnology Information. TMS FDA approval and evidence base. https://pmc.ncbi.nlm.nih.gov/articles/PMC8864803/
3. National Center for Biotechnology Information. Deep TMS evidence and FDA clearances. https://pmc.ncbi.nlm.nih.gov/articles/PMC10523198/
4. National Institute of Mental Health. TMS safety and side effects. https://www.nimh.nih.gov/news/media/2020/sarah-h-lisanby-transcranial-magnetic-stimulation-safety-and-risk
5. Mayo Clinic. Transcranial magnetic stimulation overview. https://www.mayoclinic.org/tests-procedures/transcranial-magnetic-stimulation/about/pac-20384625

Medical Disclaimer
The information in this blog is for educational purposes only and does not constitute medical advice. Transcranial magnetic stimulation and other psychiatric treatments should only be pursued under the supervision of a licensed psychiatric provider familiar with your full medical and psychiatric history. Individual results vary. NeuroStar Advanced Therapy is only available by prescription. A doctor can help decide if TMS therapy is right for you. If you are experiencing a mental health crisis or thoughts of self-harm, please call or text 988 to reach the Suicide and Crisis Lifeline or go to your nearest emergency room.