Everything you need to know about TMS and Pregnancy: Safety Data, Considerations, and Treatment Options — how it works, what it costs, and how to find a provider who actually knows what they're doing.
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Peripartum depression — depression occurring during pregnancy or in the postpartum period — has been estimated to affect roughly 12% of women (Miuli et al., 2023). It is undertreated, in part because many standard antidepressant medications carry concerns about first-trimester exposure and breastfeeding compatibility.
TMS presents itself as an attractive option for this population: localized to the brain, non-systemic, with no systemic medication exposure to the patient or fetus. The safety data is limited, mostly from small studies, but so far reassuring.
What You’ll Learn
- What the safety evidence for TMS in pregnancy looks like
- Regulatory status and professional guidance
- How TMS compares to antidepressants for pregnant patients with depression
- Postpartum considerations including breastfeeding compatibility
What We Know About TMS Safety in Pregnancy
TMS devices are regulated by the FDA as medical devices, which do not carry pregnancy categories the way drugs historically did. Pregnancy is not a studied indication on the FDA labeling of TMS devices, and pregnant patients were generally excluded from the pivotal trials. This is not unique to TMS; virtually no psychiatric treatment has robust pregnancy safety data from randomized trials.
The available evidence comes from a few sources:
Systematic reviews of small studies. A 2019 systematic review of rTMS in peripartum depression (87 patients across one randomized trial, uncontrolled trials, and case series) reported no serious adverse events, and that obstetric and neonatal complications were infrequent (Cole et al., 2019). A 2023 systematic review of 23 studies found that none reported major side effects for newborns (2023 review). Authors of both reviews noted that the research is limited and mostly at higher risk of bias.
Case series have documented TMS treatment in pregnant patients with depression, with no reported fetal complications. These are not controlled data.
Mechanistic reasoning. TMS produces localized effects in the brain with no systemic drug exposure, and the magnetic field falls off rapidly with distance from the coil, so it is not expected to reach the abdomen. This is a reasoned expectation rather than proof of safety.
The reviews above did not identify evidence of harm, but the numbers studied are small, so rare risks cannot be excluded.
Clinical Practice Guidelines
Pregnancy is not generally listed as a contraindication to TMS, but data in pregnant women is limited, and guidance from professional organizations on TMS in pregnancy is evolving. We recommend asking your obstetrician and your TMS psychiatrist what current guidance they follow rather than relying on any single summary.
Practical Considerations During Pregnancy
If you are pregnant and considering TMS, discuss the following with your treatment team:
Timing of sessions. Some clinicians prefer to delay elective TMS until after the first trimester when major organogenesis is complete. Others proceed without delay, given the absence of a known mechanism of harm. Discuss your preferences with your doctor.
Positioning. As pregnancy progresses, lying flat on your stomach (even with a coil access opening) becomes less comfortable and may be contraindicated for some patients in later pregnancy due to vena cava compression. Most TMS clinics can accommodate pregnancy with modified positioning after the first trimester.
Anxiety reduction. Pregnancy often brings anxiety about every exposure, medication, and activity. It is normal and reasonable to have questions. Ask your TMS clinician to walk you through their specific experience with pregnant patients and their approach to safety questions.
Concurrent therapy. Most pregnant patients receiving TMS also participate in psychotherapy — particularly interpersonal therapy or cognitive behavioral therapy, which have good evidence in perinatal depression. TMS can complement therapy without replacing it.
TMS vs. Medication During Pregnancy
The risk-benefit calculation for antidepressants during pregnancy is genuinely complex. SSRIs, particularly paroxetine, carry some increased risk. The absolute risks in most studies are small, but they are real. For patients with severe depression who need treatment, this creates genuine tension.
TMS offers a way to treat depression without these concerns. For pregnant patients who have failed psychotherapy alone, TMS is a reasonable escalation option.
That said, TMS during pregnancy is not trivial. It requires daily clinic visits for weeks. For patients in the third trimester, logistical challenges increase as pregnancy progresses. Some patients choose to defer TMS until after delivery if the depression is not severe enough to warrant treatment during pregnancy.
Postpartum Considerations
Postpartum depression is common and often severe. TMS is increasingly used in the postpartum period, including in breastfeeding patients. Because TMS is not a medication, there is no drug exposure through breast milk, which is an advantage over antidepressant medications that require careful evaluation of breastfeeding compatibility. Evidence in breastfeeding patients is limited but has not shown problems.
Postpartum TMS often involves scheduling that accommodates infant care — early morning sessions before the baby wakes, or scheduling around feeding times. Many clinics are flexible with postpartum patients.
What to Discuss With Your OB/GYN
Before starting TMS during pregnancy, have a conversation with your obstetrician. Key points to cover:
- Your current depression severity and treatment history
- Whether you are already on medications (which may be continued or tapered depending on the situation)
- Any obstetric risk factors that might affect the decision
- The TMS clinic’s experience with pregnant patients
- Your preferences and concerns
Your obstetrician should be informed and on board. Good care is coordinated care.
The Bottom Line
TMS is a non-drug option that clinicians sometimes consider for depression during pregnancy. The mechanistic rationale for safety is reasonable, and small studies to date have not shown harm, but the evidence is limited.
For pregnant patients with moderate to severe depression who have not responded to psychotherapy and are considering medication, TMS is an option to discuss with your treatment team. The absence of systemic drug exposure is an advantage when carrying a pregnancy, balanced against the limited safety data.
The decision should be made individually, weighing the severity of depression, the patient’s preferences, and the clinical context. TMS may be one of the options worth discussing, alongside psychotherapy and medication.
Frequently Asked Questions
Is TMS safe during pregnancy?
The available evidence is limited but reassuring. The magnetic field is localized to the brain and is not expected to reach the abdomen, and small studies and systematic reviews have not identified serious harm. Pregnancy is generally not a listed contraindication, but data is limited, so the decision should be made with your obstetrician and TMS psychiatrist.
Can I breastfeed while receiving TMS?
TMS is not a medication, so there is no drug exposure through breast milk. A 2023 systematic review described a good safety and tolerability profile even during breastfeeding, though the evidence base is small. Discuss it with your TMS psychiatrist and pediatrician.
When during pregnancy is it best to receive TMS?
Some clinicians prefer to delay elective TMS until after the first trimester when major organogenesis is complete. Others proceed without delay given the absence of a known mechanism of harm. Discuss your preferences with your doctor. As pregnancy progresses, positioning during TMS sessions may become more challenging due to physical discomfort. Most clinics can accommodate pregnancy with modified positioning after the first trimester.
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