How Good Is TMS for OCD? A Practical Look at the Evidence

How effective is TMS for OCD?

The short answer is that transcranial magnetic stimulation (TMS) can provide meaningful symptom relief for some adults with obsessive-compulsive disorder (OCD), but it is not a guaranteed treatment. The evidence is promising, particularly for people whose symptoms have not improved enough with established treatments.

A 2023 analysis combined 25 randomized, sham-controlled trials involving 860 participants. Overall, repetitive TMS reduced OCD symptom severity more than sham treatment. In the trials reporting response rates, about 4 in 10 participants receiving active TMS responded, compared with fewer than 1 in 10 receiving sham treatment.

These averages do not predict what will happen for one person. The trials used different definitions of response, treatment schedules, coils and brain targets. There was also evidence that published response findings may present a somewhat more favourable picture than the complete evidence base.

Where does TMS fit in OCD treatment?

For most adults, established treatments remain the starting point. These include cognitive behavioural therapy using exposure and response prevention, often called ERP, and medications that affect serotonin. Some people benefit from combining psychotherapy and medication.

TMS may become relevant when OCD continues to cause substantial distress or disruption despite adequate treatment attempts. It may also be worth discussing when standard options have caused difficult side effects or have not been accessible, although suitability still requires an individualized clinical assessment.

Before moving to TMS, a clinician should examine whether previous treatments were adequate. For example, OCD-focused psychotherapy should include appropriately delivered ERP rather than general supportive counselling alone. Medication history, dose, duration, adherence and tolerability may also affect what should be considered next.

Why the TMS protocol matters

TMS is not a single, uniform treatment. OCD trials have stimulated several brain regions and used different frequencies, coil designs and treatment schedules. The 2023 analysis did not establish one clearly superior approach, and it did not include theta burst stimulation trials.

This means that evidence for “TMS in general” is not enough when making a treatment decision. Patients should ask which protocol is being proposed, whether it was designed for OCD, and how closely it matches the methods supported by clinical research.

The analysis also found that improvement in depression tended to occur alongside greater improvement in OCD. This is clinically relevant because depression commonly complicates OCD, but it does not prove that treating depression alone will resolve obsessive thoughts or compulsions.

What remains uncertain?

Most trials assessed symptoms shortly after treatment. Long-term follow-up was limited, so the durability of improvement and the best approach to maintenance treatment remain uncertain.

Researchers also do not yet know which OCD symptoms or patient characteristics best predict benefit. Findings about session length and number of sessions were exploratory and should not be treated as instructions for designing an individual treatment plan.

• TMS may help without producing full remission.

• Benefits can vary substantially between people.

• Different TMS protocols do not have identical evidence.

• Long-term benefit is less well studied than short-term symptom change.

Questions to ask when considering TMS for OCD

A consultation should clarify both whether TMS is reasonable and whether other evidence-based options have been fully explored. Useful questions include:

• Which OCD-specific TMS protocol would be used, and what evidence supports it?

• Have my previous ERP and medication trials been adequate?

• How will symptoms and functional change be measured?

• What side effects, practical demands and alternatives should I consider?

• What is known—and not known—about maintaining any benefit?

Seeking an assessment in British Columbia

For adults on Vancouver Island or elsewhere in British Columbia, deciding whether to pursue TMS should involve more than a general online summary. A specialist assessment can review symptom patterns, previous treatment, co-occurring conditions and whether a particular protocol is clinically appropriate.

NeuroLinks provides TMS in Nanaimo. Contact NeuroLinks to ask about assessment and referral requirements; general information cannot determine whether TMS is suitable for an individual patient.