The short version
- •TMS uses focused magnetic pulses to stimulate specific brain regions involved in mood — a non-drug, non-invasive treatment delivered in a series of brief clinic sessions while you are awake.
- •It is FDA-cleared for treatment-resistant depression and for OCD, and is used for several other conditions.
- •A standard course is ~20-36 daily sessions over 4-9 weeks (newer accelerated and theta-burst protocols are shorter).
- •It has no systemic side effects (no sexual dysfunction, weight gain, or sedation); the main downside is the time commitment of frequent clinic visits, plus mild scalp discomfort or headache.
- •Evidence shows meaningful response and remission rates in treatment-resistant depression, making it a well-established non-drug option.
- •TMS and ketamine are both rapid-acting, non-traditional options for treatment-resistant depression; they differ in mechanism, format (clinic device vs at-home medication), and speed.
What it is
Transcranial magnetic stimulation is a non-invasive neuromodulation treatment that uses a magnetic coil placed against the scalp to deliver focused magnetic pulses to specific brain regions — most commonly the left dorsolateral prefrontal cortex in depression. The pulses induce small electrical currents that modulate the activity of mood-regulating circuits. It requires no medication, no anesthesia, and no sedation: the patient is awake and can drive themselves home afterward. A standard treatment course involves daily sessions (typically weekdays) over several weeks; newer protocols such as theta-burst stimulation deliver treatment in much shorter sessions, and accelerated protocols compress the course further. TMS is FDA-cleared for treatment-resistant major depression and for OCD (with a specific protocol and coil), and is studied in other conditions. Because it acts locally on brain circuits rather than systemically, it avoids the body-wide side effects of medications.
What it helps with
FDA-cleared for treatment-resistant depression, with established response and remission rates.
Treatment-resistant depression
A core indication — for patients who have not responded to antidepressants.
FDA-cleared with a specific deep-TMS protocol as an adjunct treatment.
Bipolar depression
Used cautiously in the depressive pole; protocols and switch-risk are managed by the treating clinician.
What to expect
A course of sessions
Typically ~20-36 daily weekday sessions over 4-9 weeks; theta-burst and accelerated protocols are shorter.
Awake and non-sedated
You sit in a chair, the coil is positioned on your scalp, and you can resume normal activities (including driving) immediately.
Sensations
Tapping on the scalp and possible mild headache or scalp discomfort, usually easing over the first sessions.
No systemic side effects
No sexual dysfunction, weight gain, or sedation; the rare seizure risk is very low with screening.
The evidence
TMS is a well-established, evidence-based treatment for treatment-resistant depression. Meta-analyses of high-frequency repetitive TMS (Berlim 2014) demonstrate significantly higher response and remission rates versus sham stimulation, and it is FDA-cleared for treatment-resistant depression and OCD. Newer theta-burst and accelerated protocols have expanded its delivery. It is recommended in guidelines as an option for depression that has not responded to medication.
How it pairs with ketamine
TMS and ketamine are two of the leading non-traditional, relatively rapid options for treatment-resistant depression, and patients often weigh them against each other. They differ in important ways: TMS is a non-drug, in-clinic device treatment requiring many visits with no systemic side effects; ketamine is a medication (at-home sublingual in Tovani's model) that works through the glutamate system and can act within hours. They are not mutually exclusive — some patients use one after the other — and the right choice depends on logistics, prior response, side-effect priorities, and clinical picture. Tovani offers at-home ketamine; the Treatment Navigator and a clinician can help compare it with TMS for an individual situation.
Frequently asked
What does TMS feel like?
You sit awake in a chair while a magnetic coil on your scalp delivers pulses that feel like tapping. The most common side effects are mild scalp discomfort or headache, which usually ease over the first sessions. You can drive yourself home and resume normal activities right away.
How long is a course of TMS?
A standard course is roughly 20-36 daily weekday sessions over 4-9 weeks. Newer theta-burst and accelerated protocols are considerably shorter. The frequent clinic visits are the main practical downside.
TMS or ketamine — which is better?
They're different tools for treatment-resistant depression. TMS is a non-drug clinic device with no systemic side effects but many visits; ketamine is a medication that can work within hours and (at Tovani) is done at home. Neither is universally "better" — the choice depends on logistics, side-effect priorities, prior response, and your clinical picture, and they can be used in sequence.
Does TMS have side effects?
Far fewer than medications — no sexual dysfunction, weight gain, or sedation, since it acts on brain circuits locally rather than throughout the body. Mild scalp discomfort or headache is common early; serious side effects like seizure are very rare with proper screening.
References
- Berlim MT et al. 2014, Psychological Medicine. Meta-analysis of high-frequency repetitive TMS for major depression, showing significantly higher response and remission rates versus sham. PMID 23507264