If you are considering transcranial magnetic stimulation (TMS) for depression, one of your first questions is probably: “How many sessions will I need before I feel better?”
The honest answer is that TMS is usually a course of treatment: not a one-time procedure. Most people receiving TMS for major depressive disorder attend weekday sessions for approximately 4 to 6 weeks, with a common range of 20 to 30 acute treatments. Some protocols and individual treatment plans extend closer to 30–36 sessions.
That timeline can feel like a significant commitment, especially when depression has already made work, transportation, concentration, and daily routines difficult. Your concern is understandable. At Light-tunnel Behavioral Health Services Inc. in New Haven, we help patients understand what to expect so the process feels structured, collaborative, and manageable.
The short answer: expect about 4–6 weeks
For depression, a traditional TMS course commonly follows this pattern:
- Frequency: One session per weekday, generally Monday through Friday
- Acute treatment length: Approximately 4–6 weeks
- Typical acute session count: About 20–30 sessions
- Longer courses: Some patients receive 30–36 sessions, depending on their response and protocol
- Session length: BrainsWay Deep TMS sessions for depression are often about 20 minutes. Some protocols on certain TMS systems can be much shorter, with some treatments lasting around 3 minutes, depending on the device and treatment settings.
- Afterward: Some patients may be offered tapering, continuation, or booster treatments
The exact plan depends on your diagnosis, symptom severity, prior treatment history, medications, medical history, and how your symptoms change during treatment.
The Clinical TMS Society consensus recommendations describe daily prefrontal TMS over 4–6 weeks, or approximately 20–30 sessions, as the evidence-based acute treatment framework for adults with depression (Perera et al., 2016).
Why does TMS require so many sessions?
TMS uses repeated magnetic pulses to stimulate targeted brain networks involved in mood regulation. The treatment is noninvasive, but its effects are built through repetition.
Think of your brain as a network of pathways rather than a single switch. In depression, communication between areas involved in motivation, emotional regulation, attention, and reward processing can become less flexible. TMS repeatedly activates neurons in a targeted region: often the dorsolateral prefrontal cortex: helping encourage changes in cortical excitability and functional connectivity.
A useful metaphor is physical therapy. One stretching session may feel helpful, but lasting improvement usually comes from repeated, carefully dosed practice. Similarly, TMS sessions provide repeated stimulation that may support neuroplasticity: the brain’s ability to adapt and reorganize.
That is why consistency matters, even when you do not notice immediate changes.
A realistic week-by-week TMS timeline
Before session 1: Evaluation and preparation
Before treatment begins, your psychiatric provider reviews your symptoms, treatment history, medications, medical conditions, and any factors that could affect safety.
Your TMS team may ask about:
- A personal or family history of seizures
- Head injuries, stroke, or neurological conditions
- Metal or implanted medical devices
- Current medications and recent medication changes
- Sleep deprivation, substance use, or significant changes in health
- Symptoms of bipolar disorder, mania, or hypomania
The first treatment visit generally includes motor threshold testing. This helps the clinician determine the stimulation intensity appropriate for you. The treatment target and settings are individualized rather than selected randomly.
Week 1: Getting comfortable with the process
During your first few treatments, you may notice tapping or pulsing sensations on the scalp and hear a clicking sound. Some patients experience temporary scalp tenderness or a mild headache, particularly while adjusting to the stimulation.
The first week is also about building familiarity:
- Learning how to sit comfortably during treatment
- Wearing appropriate hearing protection
- Finding a tolerable stimulation intensity
- Establishing a reliable appointment routine
- Reporting any side effects or medication changes
It is common not to feel dramatically different after the first few sessions. Early treatment is often more about establishing the foundation.
Weeks 2–3: Watching for early changes
Some patients begin noticing changes during the second or third week: roughly after 10–15 sessions. These changes may be subtle at first:
- Falling asleep more easily
- Experiencing fewer hopeless thoughts
- Having slightly more energy
- Feeling less emotionally overwhelmed
- Becoming more interested in activities
- Finding it easier to complete everyday tasks
You may not experience improvement in a straight line. A better morning may be followed by a difficult afternoon. That does not necessarily mean the treatment is failing. Depression symptoms naturally fluctuate, and TMS effects may accumulate gradually.
In a randomized controlled trial of daily left prefrontal TMS, symptom reductions were observed during the acute treatment period, with the strongest evaluation occurring after several weeks of treatment (George et al., 2010).
Weeks 4–6: Evaluating the full response
By weeks 4–6, many patients and clinicians have a clearer picture of whether TMS is helping. The treatment team may compare your current symptoms with your baseline using structured tools such as the PHQ-9, QIDS, or another validated depression scale.
Your clinician may evaluate:
- Whether depressive symptoms have meaningfully decreased
- Whether your sleep, appetite, motivation, or concentration has improved
- Whether you are functioning more effectively at home or work
- Whether side effects remain manageable
- Whether further acute treatments may be clinically appropriate
The pivotal randomized controlled trial of BrainsWay Deep TMS for major depressive disorder used 20 weekday sessions over 4 weeks. In that study, active Deep TMS produced greater improvement than sham treatment, supporting its FDA clearance for depression (Levkovitz et al., 2015).
What makes BrainsWay different?
BrainsWay Deep TMS uses an H-coil design intended to stimulate broader and deeper prefrontal brain regions than traditional figure-eight coils. BrainsWay is one of the most researched TMS systems for depression, with a pivotal multicenter, double-blind randomized controlled trial supporting its use in treatment-resistant major depressive disorder.
The 2015 BrainsWay trial included 212 adults with depression who had not achieved satisfactory improvement with previous antidepressant treatment. Participants received five treatments per week for four weeks. Active Deep TMS resulted in higher response and remission rates than sham treatment (Levkovitz et al., 2015).
It is important to understand that research evidence does not guarantee a particular outcome for every individual. TMS response varies, and your psychiatric provider should explain the potential benefits, limitations, alternatives, and risks before treatment begins.
What if I do not feel better after 20 sessions?
Not feeling a major change by session 20 does not automatically mean TMS will not work for you. Some patients respond later, especially when they have had a long depressive episode, substantial treatment resistance, or gradual improvement that is not immediately obvious.
Your treatment team may consider:
- Continuing for additional sessions if you are improving but have not reached a plateau
- Reviewing stimulation settings or treatment tolerability
- Rechecking your motor threshold when clinically indicated
- Reviewing medication changes, sleep, substance use, or other health factors
- Reassessing the diagnosis and treatment goals
- Discussing other options, such as medication management, psychotherapy, or esketamine treatment
The goal is not to reach an arbitrary number of sessions. The goal is to provide enough treatment to evaluate your response safely and responsibly.
What happens after the acute TMS course?
If you respond well, your clinician may recommend a transition plan. This might include:
- A gradual taper over several weeks
- Ongoing medication management
- Psychotherapy or behavioral strategies
- Regular symptom monitoring
- Occasional continuation or booster sessions
- Reintroduction of TMS if depressive symptoms return
In the BrainsWay randomized trial, participants received twice-weekly continuation treatments for an additional 12 weeks after the acute phase. However, maintenance plans vary, and there is no single schedule that is right for everyone.
Short treatment gaps do not necessarily mean that your entire course has been lost. A clinical review of patients receiving TMS found that modest interruptions were not associated with meaningfully worse final outcomes, although you should always contact your treatment team as soon as possible if you need to miss a session (Kokdere et al., 2020).
How to make your TMS timeline easier to manage
What to do
- Keep appointments as consistently as possible.
- Tell your treatment team about medication changes.
- Protect your sleep, especially during the early treatment period.
- Eat and hydrate normally unless your clinician gives different instructions.
- Track changes in mood, motivation, sleep, and functioning.
- Report headaches, scalp discomfort, mood elevation, agitation, or unusual symptoms.
- Ask questions whenever you feel uncertain.
What to avoid
- Do not stop psychiatric medication without medical guidance.
- Do not hide substance use or major sleep changes from your treatment team.
- Do not assume that one difficult day means treatment has failed.
- Do not compare your progress too closely with someone else’s timeline.
- Do not continue treatment without reporting significant side effects.
At Light-tunnel Behavioral Health Services Inc. in New Haven, Dr. Omolola Aragbada, PMHNP, is one of the psychiatric providers who supports individualized behavioral and mental health care. Your TMS plan should be shaped around your clinical needs: not only around a calendar.
A hopeful, realistic perspective
TMS is not an instant cure, and no responsible clinician can promise a specific number of sessions or a guaranteed outcome. But depression is also not a permanent verdict on who you are. Symptoms can change, brain networks can adapt, and treatment can be adjusted when the first approach is not enough.
For many people, the most realistic expectation is 20–30 weekday sessions over 4–6 weeks, followed by a careful assessment of progress and next steps. You deserve clear information, compassionate monitoring, and a treatment plan that recognizes both the science of depression and the person experiencing it.
Continue the series: TMS Therapy for Depression: How It Works and Why New Haven Patients Are Turning to It
Medical and safety disclaimer
This article is for educational purposes only. It does not diagnose depression, determine whether TMS is appropriate for you, or replace an evaluation by a qualified psychiatric or medical professional. TMS protocols, eligibility requirements, risks, benefits, insurance coverage, and maintenance plans vary by patient and device. Discuss your complete medical history, implanted devices, seizure risk, medications, bipolar symptoms, pregnancy status, and any changes in mood or sleep with your treatment team.
TMS is not intended to replace emergency psychiatric care. If you may hurt yourself or someone else, cannot stay safe, or are experiencing a psychiatric emergency, call or text 988 in the United States and Canada, call 911, or go to the nearest emergency department. Do not wait for a TMS appointment to seek urgent help.
References
Levkovitz Y, Isserles M, Padberg F, et al. Efficacy and safety of deep transcranial magnetic stimulation for major depression: a prospective multicenter randomized controlled trial. World Psychiatry. 2015;14(1):64–73. doi:10.1002/wps.20199. PubMed
George MS, Lisanby SH, Avery D, et al. Daily left prefrontal transcranial magnetic stimulation therapy for major depressive disorder: a sham-controlled randomized trial. Archives of General Psychiatry. 2010;67(5):507–516. doi:10.1001/archgenpsychiatry.2010.46. PubMed
Perera T, George MS, Grammer G, et al. The Clinical TMS Society consensus review and treatment recommendations for TMS therapy for major depressive disorder. Brain Stimulation. 2016;9(3):336–346. doi:10.1016/j.brs.2016.03.010. Full text
Kokdere F, Tirrell E, Fukuda AM, et al. Do deviations from the 5 sessions per week schedule impact outcomes of transcranial magnetic stimulation for major depressive disorder? Brain Stimulation. 2020;13(6):1491–1493. doi:10.1016/j.brs.2020.08.001. Full text
O’Reardon JP, Solvason HB, Janicak PG, et al. Efficacy and safety of transcranial magnetic stimulation in the acute treatment of major depression: a multisite randomized controlled trial. Biological Psychiatry. 2007;62(11):1208–1216. doi:10.1016/j.biopsych.2007.01.018. PubMed