TMS Therapy for Depression: How It Works, Side Effects & Results

TMS (transcranial magnetic stimulation) is a non-invasive treatment for depression that uses magnetic pulses to stimulate the part of the brain involved in mood regulation. It is mainly used when antidepressants haven't helped enough or caused side effects. It needs no anaesthesia, is done as an outpatient, and people can usually return to normal activities straight after each session.

TMS at a glance

• What it treats: mainly major depression that hasn't responded well to medication (treatment-resistant depression).
• How it's given: a magnetic coil held against the scalp; you stay awake throughout.
• Session length: about 3 to 40 minutes, depending on the protocol.
• Course length: usually 5 sessions a week for 4 to 6 weeks (about 20 to 30 sessions).
• Common side effects: scalp discomfort and mild headache, which usually settle as the course continues.
• Anaesthesia or recovery time: none.
• Regulatory status: cleared by the US FDA for treatment-resistant depression since 2008.

What is TMS therapy?

TMS therapy, often called rTMS (repetitive transcranial magnetic stimulation), is a form of neuromodulation: a treatment that changes how brain networks behave using targeted stimulation rather than medicine. A magnetic coil placed on the scalp sends brief magnetic pulses into a specific area of the brain, which creates small electrical currents in the nerve cells there.

TMS is different from ECT (electroconvulsive therapy). TMS does not cause a seizure, does not need general anaesthesia, and does not typically affect memory.

Read more on our rTMS treatment page.

How does TMS work for depression?

TMS works by stimulating the left dorsolateral prefrontal cortex, a brain region that is often underactive in depression and is connected to deeper areas that regulate mood. Repeated sessions are thought to gradually strengthen activity in these mood-regulating networks, which is why TMS is given as a daily course rather than a single treatment.

Who is TMS suitable for?

TMS may be considered for adults who:

• have been diagnosed with major depression;
• have tried at least one antidepressant at an adequate dose and duration without enough improvement;
• couldn't tolerate the side effects of antidepressants; or
• prefer a non-medication option alongside therapy, after discussing it with a doctor.

Who should not have TMS?

TMS is generally not suitable for people with metal implants in or near the head, such as cochlear implants, aneurysm clips, or implanted brain stimulators, because the magnetic field can affect them. It is used with extra caution in people with epilepsy or a history of seizures. A screening assessment before treatment checks for these factors. Braces and ordinary dental fillings are usually not a problem.

What happens during a TMS session?

1. Mapping (first session only): the clinician finds the right spot and strength by briefly stimulating the area of the brain that moves your thumb. This sets your individual treatment dose.
2. Positioning: you sit in a reclining chair, fully awake. The coil is placed against your head, and you may be given earplugs because the device makes a clicking sound.
3. Stimulation: you feel a tapping sensation on the scalp during the pulses. Standard sessions take about 20 to 40 minutes; theta burst sessions take about 3 minutes.
4. Afterwards: you can drive, work, and go about your day straight away.

How many TMS sessions are needed?

A typical course is 20 to 30 sessions, given 5 days a week over 4 to 6 weeks. Some people notice changes within two to three weeks, while others improve later in the course. Some clinics also offer accelerated protocols with several sessions a day over a shorter period. The right schedule depends on your assessment.

How effective is TMS for depression?

In clinical trials for treatment-resistant depression, roughly half of patients respond to TMS and about three in ten reach remission. In the large THREE-D trial of 414 patients, 47% responded to standard 10 Hz TMS and 49% to 3-minute theta burst TMS, with remission rates of 27% and 32% respectively.

"Response" means symptoms dropped by at least half; "remission" means symptoms fell low enough to be considered minimal. These figures come from people whose depression had already not improved with medication, a group for whom each additional option matters.

TMS doesn't work for everyone, and nobody can promise a specific result in advance. Results are often best when TMS is part of a wider plan that includes medication review and psychological therapy such as CBT.

What are the side effects of TMS?

• Common: scalp discomfort or pain at the stimulation site, and mild headache. These are usually worst in the first week and ease as treatment continues. Ordinary painkillers typically help.
• Less common: light-headedness, facial twitching during pulses, or tiredness after sessions.
• Rare: seizure. The risk is estimated at less than 0.1% and is reduced further by screening before treatment.

TMS does not usually cause the weight gain, sexual side effects, or memory problems associated with some other depression treatments.

TMS vs antidepressants vs ECT

These treatments aren't competitors. Many people use more than one, and the right mix depends on your situation.

Getting TMS in Delhi

At Brain Bridge Clinic in Safdarjung Enclave, New Delhi, neuromodulation is only offered after a structured assessment. We confirm the diagnosis, review what you've already tried, screen for safety, and discuss whether TMS fits your care plan, alongside rather than instead of other treatment. Learn more about how we approach depression and anxiety, or book an assessment.

Frequently asked questions

Does TMS therapy hurt?

TMS isn't usually painful, but many people feel a tapping or knocking sensation on the scalp and some discomfort at the stimulation site, especially in the first few sessions. This typically eases as the course continues.

Is TMS therapy safe?

Yes, for suitable patients. TMS has been cleared by the US FDA for depression since 2008, and serious side effects are rare. Screening before treatment checks for metal implants and seizure risk.

Can I drive after a TMS session?

Yes. TMS doesn't need anaesthesia or sedation, so most people drive, work, and return to normal activities immediately after each session.

Do I need to stop my antidepressants during TMS?

Usually not. Many people continue their medication during a TMS course. Any change to medication should only be made with your doctor.

How long do the effects of TMS last?

For many people who respond, improvement lasts for months or longer. Some people benefit from occasional maintenance sessions or a repeat course if symptoms return.

Is TMS the same as ECT or "shock therapy"?

No. TMS uses magnetic pulses on an awake patient, doesn't cause a seizure, and doesn't need anaesthesia. ECT is a different treatment given under general anaesthesia.

What is theta burst TMS?

Theta burst stimulation (iTBS) is a newer TMS pattern that delivers a session in about 3 minutes instead of 20 to 40. A large trial found it works about as well as standard TMS for treatment-resistant depression, though some people find it slightly more uncomfortable.

If you need help now

TMS is not an emergency treatment. If you are having thoughts of harming yourself, contact emergency services or call India's Tele-MANAS mental health helpline on 14416 (free, 24/7).

References

• Blumberger DM, Vila-Rodriguez F, Thorpe KE, et al. Effectiveness of theta burst versus high-frequency repetitive transcranial magnetic stimulation in patients with depression (THREE-D): a randomised non-inferiority trial. The Lancet. 2018;391(10131):1683–1692. doi.org/10.1016/S0140-6736(18)30295-2
• What the Non-Psychiatrist Should Know About Transcranial Magnetic Stimulation for Major Depression. PubMed Central