What is rTMS Treatment? How It Works, Who It Helps & What to Expect

Repetitive Transcranial Magnetic Stimulation — rTMS — is a non-invasive brain stimulation therapy that uses magnetic pulses to activate specific areas of the brain involved in mood regulation. It is FDA-cleared for treatment-resistant depression, OCD, and anxious depression, and is available at Cadabams Mindtalk in Bangalore as part of our integrated psychiatry care.

Speak to a Mindtalk psychiatrist about whether rTMS is right for you.

How Does rTMS Work?

A figure-eight magnetic coil is placed against the scalp, typically over the left prefrontal cortex — the region consistently underactive in depression. The coil delivers rapid magnetic pulses (the same physical principle as an MRI scanner) that induce small electrical currents in the underlying brain tissue, stimulating neurons to fire.

Repeated stimulation over multiple sessions produces lasting changes in synaptic connectivity — essentially "retraining" how brain circuits communicate. High-frequency rTMS (10 Hz+) applied to the left prefrontal cortex increases activity in circuits that regulate mood, motivation, and executive function. Low-frequency rTMS (1 Hz) applied to the right prefrontal cortex decreases overactivity in the same circuit from the other side.

The result, over a full course of treatment, is normalisation of the circuit's activity — which correlates with improvement in depressive symptoms.

Who Is rTMS For?

rTMS is most commonly recommended for:

Treatment-resistant depression (TRD): Defined as depression that has not responded to at least two adequate antidepressant trials. This describes roughly 30% of people diagnosed with major depressive disorder. Response rates for rTMS in TRD are 50–60%; remission rates are 30–35% — significantly better than trying a third antidepressant at this stage of treatment.

Major depressive disorder (MDD): Even in patients who haven't failed multiple medications, rTMS is offered as an alternative to medication for those who are pregnant, intolerant of antidepressant side effects, or prefer a non-pharmacological approach.

OCD: Deep TMS with an H-coil targeting the medial prefrontal cortex is FDA-cleared for OCD in patients who have not responded adequately to SSRIs.

Anxious depression: The FDA cleared rTMS specifically for the anxious depression subtype in 2021. Patients with significant anxiety alongside depression often respond particularly well to the prefrontal stimulation protocol.

PTSD, chronic pain, and migraine: rTMS is used off-label for these conditions, with growing clinical evidence but not yet a formal clearance in India.

What Happens in an rTMS Session?

Each session takes 20–40 minutes. You sit in a reclined chair, fully awake. No sedation, no cannula, no hospital admission. A technician positions the coil against your scalp, confirmed against a brain mapping (motor threshold) test that calibrates the intensity to your individual brain excitability.

During the session, you hear a clicking sound and feel a repetitive light tapping on your scalp at the stimulation site. You are awake and can talk to the technician, read, or listen to music. At the end of the session, you stand up and leave — no recovery time required, and no driving restriction.

A standard course is 20–36 sessions, delivered 5 days per week over 4–6 weeks. Most patients begin to notice mood changes by week 2 or 3. The full response continues to consolidate over the 4–6 week period and sometimes for weeks after the course ends.

Some patients receive maintenance rTMS sessions after completing the acute course — monthly or bimonthly sessions to sustain the response, particularly if previous medication trials failed and relapse risk is high.

rTMS vs. ECT: Key Differences

Both rTMS and ECT (electroconvulsive therapy) stimulate brain activity, but they are very different in practice:

ECT involves placing electrodes on the scalp and passing a brief electrical current to produce a controlled seizure under general anaesthesia. It is faster-acting (response in 1–2 weeks) and more powerful, with response rates above 80% for severe TRD. However, it requires anaesthesia, causes temporary memory side effects, and typically needs an inpatient setting.

rTMS is outpatient, requires no anaesthesia, and produces no memory side effects. It takes 4–6 weeks to show full response. It is generally used as a step before ECT in the treatment algorithm — tried first because of its safety profile, with ECT escalated if rTMS doesn't produce remission or if clinical urgency (psychosis, catatonia, high suicide risk) makes the faster ECT response necessary.

For most patients with treatment-resistant depression who are clinically stable, rTMS is the preferred first-line brain stimulation option.

Is rTMS Safe? Side Effects in Detail

rTMS has a strong safety record after more than two decades of clinical use. The most common side effects:

Common (and usually mild): scalp discomfort or tingling at the coil site during the session; mild headache after sessions, particularly in the first week. Both typically diminish as treatment continues and resolve within 30 minutes of each session.

Rare but possible: syncope (fainting) from anxiety about the procedure; a seizure (risk estimated at less than 0.1% across a full treatment course — similar to rates seen with antidepressant medication). The technician monitors for adverse events throughout.

Not a concern: memory loss (rTMS does not produce memory effects); systemic medication side effects (none — no drug enters the body); sedation; post-procedure downtime.

The main contraindications are metal implants in or near the head (cochlear implants, deep brain stimulators, certain metallic aneurysm clips) and a personal history of epilepsy that is not well-controlled. Pregnancy is a relative contraindication — discussed case by case with the treating psychiatrist.

Starting rTMS at Mindtalk

At Cadabams Mindtalk, rTMS is offered as part of our psychiatry service in Bangalore. Treatment is administered by trained technicians under psychiatric supervision, and sessions are scheduled to integrate with your existing therapy and medication plan.

If you or a family member are managing depression that hasn't responded to medication, or looking for a non-pharmacological option, contact Mindtalk for a psychiatric consultation to assess suitability for rTMS.

You can also learn more about depression treatment options or read about CBT as a complement to rTMS for sustained recovery.