Safety & Side Effects of TMS Part 8:Comparing the Risks of TMS to ECT and Medications

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When exploring treatment options for mental health conditions like depression or OCD, people often want to know: “Is TMS safer than medication?” or “Is it anything like ECT?” These are important questions—especially for patients who’ve had bad experiences with medications or are afraid of procedures involving the brain.

This section breaks down the risks and side effects of TMS, ECT, and antidepressants in a simple way, so patients and families can make more informed choices.

TMS vs. Antidepressants

Antidepressant medications are often the first treatment offered for depression and anxiety. They can be very effective for some people—but not for everyone. About one-third of patients don’t respond to medications, and many stop taking them because of the side effects.

Common side effects of antidepressants include:

• Weight gain
• Sexual dysfunction
• Sleep problems or fatigue
• Emotional numbness
• Nausea or stomach upset
• Increased anxiety in the first few weeks

In some people—especially adolescents—medications can even increase suicidal thoughts early in treatment, which is why they require close monitoring.

TMS, by contrast, doesn’t enter the bloodstream or affect other organs. It only targets a specific region of the brain using magnetic pulses. As a result, it avoids systemic side effects entirely. The most common TMS side effects—like mild headaches or scalp discomfort—are temporary and fade over time. There’s no risk of weight gain, sexual problems, or cognitive dulling, which is a big relief for many patients.

TMS vs. ECT (Electroconvulsive Therapy)

Electroconvulsive Therapy (ECT) has been used for decades and is one of the most effective treatments for patients with severe, treatment-resistant depression—especially when symptoms are life-threatening or include psychosis. Despite its strong clinical success, ECT is often misunderstood and feared due to outdated portrayals in media and concerns about memory loss.

ECT works by inducing a controlled seizure in the brain using a brief electrical current. The goal is to “reset” certain dysfunctional brain circuits that are contributing to depression, similar to how a defibrillator resets a heart rhythm. This seizure is not like a typical seizure—it’s medically managed, short in duration (usually under 60 seconds), and done under full anesthesia with muscle relaxants so the patient does not feel it or move during the procedure.

Here’s what a typical ECT process involves:

• The patient arrives at a hospital or surgical center.
• They are placed under general anesthesia with a muscle relaxant.
• Electrodes are placed on the scalp—either unilaterally (one side) or bilaterally (both sides)—depending on the clinical goals.
• A brief electrical pulse is delivered to induce a seizure.
• The medical team monitors the patient’s heart, brain activity, and breathing throughout.
• After the procedure, the patient spends time in recovery and may experience confusion or drowsiness before returning home.

ECT is typically done 2–3 times per week, often for a total of 6–12 sessions, though some patients require maintenance sessions afterward.

Common side effects of ECT include:

• Short-term memory loss, especially around the time of treatment
• Post-treatment confusion (usually temporary)
• Headaches, nausea, or muscle aches from the anesthesia
• Cognitive difficulties in some patients, especially with bilateral electrode placement or higher treatment frequencies

While these effects are usually temporary, some patients—especially older adults or those with pre-existing cognitive decline—may experience longer-lasting memory issues.

TMS, by contrast, does not require anesthesia, does not involve seizures, and is performed while the patient is fully awake and alert. Each TMS session lasts around 20–30 minutes, depending on the protocol, and patients can drive themselves home immediately afterward. There is no recovery time and no interference with short- or long-term memory. The most common side effects with TMS—mild scalp discomfort or headache—are manageable and short-lived.

How Seizure Risk Compares

• TMS: Less than 0.1% seizure risk (less than 1 in 30,000 treatments), usually only in patients with a prior seizure history or medication interactions
• ECT: Seizures are part of the treatment and happen every session, but they are medically controlled and expected
• Antidepressants: Some medications (like bupropion or clomipramine) can lower seizure threshold, especially at higher doses

So while seizure risk sounds scary, TMS has the lowest seizure risk of the three options—especially when patients are carefully screened.

When Each Treatment Makes Sense

TMS is often chosen when medications have failed or caused too many side effects. It’s also ideal for patients who want a non-medication option or prefer to avoid anesthesia or hospital stays. Medications are usually the first-line treatment and are more accessible, but they may not be effective for everyone and often come with side effects. ECT is typically reserved for the most severe cases—such as suicidal depression, psychotic depression, or when other treatments have failed entirely. It works quickly but has higher risks.

Final Thoughts

Every treatment has pros and cons—but when it comes to safety, TMS has one of the best profiles available in mental health care today. It avoids the chemical side effects of medications and the invasiveness of ECT, making it a valuable option for patients seeking effective, well-tolerated relief from depression and other conditions.

Knowing how TMS compares to other treatments empowers patients to make choices that fit their needs—not just medically, but emotionally and practically, too.

Sources

1. Perera, T., George, M. S., et al. (2016). The Clinical TMS Society consensus review and treatment recommendations for TMS therapy for major depressive disorder. Brain Stimulation, 9(3), 336–346. https://doi.org/10.1016/j.brs.2016.03.010
2. Finnegan, M., & McLoughlin, D. M. (2019). Cognitive Side-Effects of ECT. In I. N. Ferrier & J. Waite (Eds.), The ECT Handbook (3rd ed., pp. 109–120). Cambridge University Press. https://www.cambridge.org/core/books/abs/ect-handbook/cognitive-sideeffects-of-ect/40B0A076707BE0F6A6DC0228EB0D6E52
3. Carvalho, A. F., Sharma, M. S., Brunoni, A. R., Vieta, E., & Fava, G. A. (2016). The Safety, Tolerability and Risks Associated with the Use of Newer Generation Antidepressant Drugs: A Critical Review of the Literature. Psychotherapy and Psychosomatics, 85(5), 270–288. https://pubmed.ncbi.nlm.nih.gov/27508501/
4. Martis, B., Alam, D., Dowd, S. M., et al. (2003). Neurocognitive effects of repetitive transcranial magnetic stimulation in severe major depression. Clinical Neurophysiology, 114(6), 1125–1132. https://pubmed.ncbi.nlm.nih.gov/12804681/

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