Everything you need to know about TMS During Pregnancy: What the Safety Data Actually Shows — how it works, what it costs, and how to find a provider who actually knows what they're doing.
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Perinatal depression affects roughly 1 in 7 pregnant women. That is not a small number. It is one of the most common complications of pregnancy, and it is tied to real harm. To you. To the pregnancy. To your child’s long-term development.
And yet treatment options during pregnancy are genuinely limited. Most antidepressants cross the placenta. SSRIs are generally considered relatively safe in pregnancy, but relatively safe is a phrase that keeps a lot of pregnant women up at night. Some antidepressants carry clearer risks. Certain medications are linked to neonatal adaptation syndrome, potential cardiac effects, or other concerns that make prescribing during pregnancy a careful balancing act.
Therapy helps many women, but severe depression does not always respond to therapy alone, and access to quality perinatal mental health care varies wildly by location.
This is where TMS therapy enters the picture. Magnetic pulses do not enter the bloodstream. They do not cross the placenta. The magnetic field is focused on a small area of the scalp and drops off rapidly with distance. By the time you measure a few centimeters away from the coil, the field strength is negligible. The fetus, located far from the treatment site, receives no meaningful magnetic exposure.
That is the theoretical case for safety. But theoretical is not enough when you are pregnant. You want data.
What You’ll Learn
- What published reviews of TMS in pregnancy found
- Why the evidence is still limited and what that means for you
- How perinatal TMS works in practice (timing, positioning, protocols)
- How the risk-benefit calculation works
- What to ask a potential TMS provider
What the Published Evidence Shows
Evidence on TMS in pregnancy comes mainly from case reports, case series, small open-label studies, and a few small randomized trials, which have been collected in several systematic reviews (for example, a 2016 review of 12 studies and a 2025 review in Brain and Behavior). Across these reviews, TMS has generally been well tolerated, and the authors did not identify reports of harm to the fetus or newborn. The reviews also note that the number of patients is small and that larger, multicenter trials are needed before evidence-based pregnancy protocols can be set.
Important Caveats
- The studies are small. There is no large dataset of pregnancy outcomes (miscarriage, birth defects, preterm birth) for TMS comparable to what exists for some antidepressants, so we cannot cite reliable rates for those outcomes.
- Most studies are uncontrolled. It would be ethically difficult to randomize pregnant women to TMS versus sham on a large scale.
- First-trimester data is thinner. Most treatment has been reported in the second or third trimester.
- Long-term follow-up of exposed children is limited.
TMS is not FDA-cleared specifically for use in pregnancy, so treatment during pregnancy is off-label and should be a shared decision between you, your psychiatrist, and your OB-GYN.
What Professional Bodies Say
We are not aware of a pregnancy-specific TMS guideline from ACOG or the American Psychiatric Association, and we have not been able to confirm that either organization has issued a formal position on TMS in pregnancy. Treat any claim that a professional society “endorses” TMS in pregnancy with caution, and ask your clinician what guidance they are following.
The practical position: the mechanism of action (a focused magnetic field that drops off quickly with distance, with no drug entering the bloodstream) does not suggest direct fetal exposure, available reports have not shown a safety signal, and TMS should be part of a risk-benefit conversation with your treatment team.
How Perinatal TMS Works in Practice
Timing
Most perinatal TMS treatment happens during the second and third trimesters. First-trimester treatment is less common, partly because depression is often diagnosed later in pregnancy and partly because providers tend to be more conservative during the period of organogenesis (weeks 3-8). First-trimester data is limited.
Some women begin TMS in the postpartum period to treat postnatal depression while breastfeeding, avoiding concerns about medication transfer through breast milk. Our postpartum depression guide covers this in detail.
Comfort Adjustments
Standard TMS treatment involves sitting in a reclined chair for 20-40 minutes. For pregnant women, especially in the third trimester, this requires modifications:
- Positioning: Clinics accommodate with adjustable chairs, pillows, and support to avoid supine hypotension, the drop in blood pressure that can happen when lying flat on your back during late pregnancy
- Session duration: Some clinics offer theta burst stimulation (TBS) protocols that compress treatment into 3-10 minutes, cutting down the time spent in a potentially uncomfortable position
- Frequency of monitoring: Pregnant women may get more frequent check-ins with the treating psychiatrist, and some clinics coordinate with your OB-GYN
Theta Burst Stimulation: A Practical Advantage
TBS has become increasingly relevant for pregnant women. The Stanford Accelerated Intelligent Neuromodulation Therapy (SAINT) protocol and other theta burst approaches deliver treatment in a fraction of the time of conventional TMS. For a woman at 34 weeks who can barely sit comfortably for 10 minutes, the difference between a 3-minute TBS session and a 37-minute standard session is enormous.
Data on TBS specifically in pregnancy is very limited. TBS delivers pulses in a different timing pattern than conventional TMS, and its safety in pregnancy has not been established in large studies.
To understand the different TMS protocols available, visit our technology guide.
The Risk-Benefit Calculation
Perinatal depression is not just a mood problem. Untreated depression during pregnancy is tied to:
- Poor prenatal care and nutrition
- Increased substance use
- Preeclampsia
- Preterm birth
- Low birth weight
- Impaired maternal-infant bonding
- Postpartum depression (continuation or worsening)
- Long-term behavioral and developmental effects on the child
Untreated perinatal depression is associated with real harm, and these associations are documented in the research literature.
So the risk-benefit calculation for TMS during pregnancy is not risk of TMS vs. risk of nothing. It is risk of TMS vs. risk of continued untreated depression. Framed that way, treating the depression matters, and TMS is one option that avoids systemic medication exposure, though its pregnancy evidence base is still small.
Finding a Provider
Not all TMS clinics have experience treating pregnant women. When searching for a provider, ask specifically:
- How many pregnant women have you treated with TMS? Experience matters for comfort modifications and clinical monitoring
- Do you offer theta burst protocols? Shorter sessions can be much more comfortable in late pregnancy
- Will you coordinate with my OB-GYN? Communication between your mental health provider and obstetric provider is a must
- What is your monitoring protocol for pregnant patients? Good clinics have a specific approach, not just we treat them the same as everyone else
Find TMS providers experienced with perinatal care through our specialist directory or search clinics in your area using our state-by-state finder.
Key Takeaways
- Published reviews of TMS in pregnancy have not identified harm to the fetus, but the evidence base is small and mostly uncontrolled.
- TMS is not FDA-cleared specifically for pregnancy; use is off-label and should involve your OB-GYN.
- TMS during pregnancy requires comfort modifications (positioning, possible theta burst for shorter sessions).
- The risk-benefit calculation compares risk of TMS to risk of untreated depression, which is well-documented and serious.
- First-trimester data is thinner. Most reported treatment happens in the second or third trimester.
- Ask your provider about their experience with pregnant patients and coordination with your OB-GYN.
Frequently Asked Questions
Is TMS safe during pregnancy?
Published reviews of TMS in pregnancy have generally found it well tolerated, with no reports of fetal harm, but the evidence comes from small, mostly uncontrolled studies and larger trials are needed. The mechanism of action (magnetic pulses focused on the scalp) does not suggest direct fetal exposure. Use in pregnancy is off-label, so discuss it with your psychiatrist and OB-GYN.
Does TMS affect the baby?
Published reviews have not identified adverse fetal effects, but the number of reported cases is small and long-term follow-up of exposed children is limited. The magnetic field is focused on the scalp and falls off rapidly with distance.
When during pregnancy can I get TMS?
Most perinatal TMS happens in the second and third trimesters. First-trimester data is thinner. Some women start in the postpartum period for breastfeeding safety. Some clinicians prefer to wait until after the first trimester when possible.
How is TMS different from antidepressants during pregnancy?
TMS uses magnetic pulses focused on the scalp. Nothing enters the bloodstream or crosses the placenta. Antidepressants (SSRIs, SNRIs) are systemically absorbed and do cross the placenta in varying concentrations. SSRIs are generally considered relatively safe in pregnancy, while TMS avoids systemic medication exposure to the fetus.
Does insurance cover TMS during pregnancy?
Coverage generally follows the same criteria as for non-pregnant patients (treatment-resistant depression). Many insurers cover TMS for treatment-resistant major depressive disorder when criteria are met, but pregnancy-specific coverage varies, so confirm with your plan. See our insurance guide for details.
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Related reading
- TMS for Postpartum Depression: A Drug-Free Option for New Mothers
- TMS for Multiple Sclerosis: Addressing Fatigue, Depression, and Cognitive Impairment
- What TMS Actually Feels Like: A Session-by-Session Guide
- How to Prepare for Your First TMS Session
- Take the TMS candidacy quiz
- Find a TMS clinic near you
