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July 22, 2025 10 min read Dr. Keerthy Sunder

Why Does TMS Require Multiple Sessions?

Understanding the science of neuroplasticity and why a full course of treatment is key to lasting recovery

TMS therapy session illustration

When patients inquire about TMS therapy in Palm Springs, one of the most common questions is: "Why does it take so many sessions?" Unlike a medication that enters your system immediately, TMS is a retraining process for your brain. Understanding the biological mechanisms behind this treatment reveals why a sustained course is necessary for profound, lasting change.

TMS Is Not Like Taking a Pill

The key difference: Antidepressants work by chemically altering neurotransmitter levels in the entire brain. TMS works by using magnetic fields to stimulate specific, underactive neural circuits to "wake them up" and strengthen their connections over time.

Think of depression as a state where certain pathways in your brain—specifically those regulating mood in the prefrontal cortex—have gone dormant or become weak. Simply stimulating them once isn't enough to reverse developed patterns of inactivity. To create lasting change, these pathways need repeated, consistent stimulation.

The "Gym for the Brain" Analogy

The best way to understand TMS treatment is to compare it to physical exercise. If you go to the gym once, you won't see visible muscle growth or significant weight loss. However, if you go consistently for six weeks, the cumulative effect leads to a transformed physique.

Building Mental Muscle

Each TMS session is like a "workout" for your neurons. A single session releases neurotransmitters and fires neurons, but the goal is to build strength and endurance in these circuits. It takes time for the brain to build new synaptic connections—a process known as neuroplasticity.

Harnessing Neuroplasticity

Neuroplasticity is the brain's ability to reorganize itself by forming new neural connections. TMS therapy relies heavily on a specific type of neuroplasticity called Long-Term Potentiation (LTP).

  • Stimulation: The magnetic pulses cause neurons to fire.
  • Strengthening: Repeated firing strengthens the synapse (connection) between neurons.
  • Growth: Over weeks of daily treatment, these connections become permanent, allowing mood-regulating circuits to function independently again.

This biological growth takes time. You are literally growing new physical infrastructure in your brain, akin to how learning a new language or instrument physically changes brain structure over time.

Why the Standard Protocol is 36 Sessions

The FDA-cleared protocol for depression typically involves 36 sessions, usually administered 5 days a week for 6-7 weeks. This protocol isn't arbitrary; it's based on extensive clinical trials that determined the "dose" required for remission.

Weeks 1-2: Activation

The brain begins to wake up. Patients typically don't feel major mood shifts yet, but sleep and energy may start to improve.

Weeks 3-4: The "Dip" & Lift

Some patients experience a temporary plateau or "dip" as the brain adjusts, often followed by noticeable improvements in mood.

Weeks 5-6: Consolidation

Gains solidify. Good days become more frequent and consistent as the neural pathways strengthen.

Taper Period

The final 6 sessions are often tapered (e.g., 3 times a week, then 2) to wean the brain off the support.

Commitment Yields Results

Consistency is Crucial

Because TMS relies on cumulative effects, missing sessions can disrupt the momentum of neuroplasticity. Sticking to the daily schedule gives you the highest statistical chance of achieving remission.

While the time commitment might seem daunting, it is a short-term investment for a long-term gain. Many patients who have struggled with depression for decades find that 6 weeks of dedicated time is a small price to pay for lifting the fog of depression.

Your Treatment Timeline

Standard Treatment Protocol

  • Total Sessions: 30-36 sessions
  • Duration: 6 weeks
  • Frequency: 5 days per week (Monday-Friday)
  • Session Length: 20-40 minutes each
  • Total Time Commitment: Approximately 20-30 hours over 6 weeks

While this is the standard protocol, some patients may need additional sessions based on their individual response and condition severity. Your psychiatrist will work with you to determine the optimal treatment duration.

Dr. Keerthy Sunder

About the Author

Dr. Keerthy Sunder

Board-Certified Psychiatrist | Medical Director at KarmaTMS

Dr. Keerthy Sunder is a board-certified psychiatrist specializing in TMS therapy and integrative mental health. He advocates for evidence-based, non-invasive treatments to help patients achieve lasting recovery without relying solely on medication.

Frequently Asked Questions

A single TMS session doesn't provide lasting neuroplastic changes. Think of it like physical therapy - one session might feel good, but lasting change requires consistent, repeated stimulation to create new neural pathways and strengthen beneficial brain connections.
Most patients require 30–36 sessions over 6 weeks (5 sessions per week). However, some may need fewer or more depending on their condition severity and response. Your treatment team will monitor your progress and adjust accordingly.
Consistency is critical for TMS effectiveness. Missing sessions can delay results and reduce overall effectiveness. The 5-days-per-week protocol is based on research showing this frequency optimizes neuroplastic changes while allowing the brain to consolidate improvements.
Most patients begin noticing improvements around weeks 2–3, though some may see changes earlier or later. Full benefits typically emerge by week 4-6. The gradual improvement reflects the time needed for neuroplastic changes to accumulate and stabilize.
Stopping TMS before completing the full course often results in incomplete symptom relief. While some improvement may remain, you likely won't experience the full therapeutic benefits. If you're considering stopping early, discuss with your provider about maintenance protocols or treatment modifications.
Some patients maintain their improvements without additional sessions, while others benefit from periodic maintenance treatments (monthly or quarterly) to sustain results. Your provider will help develop a personalized maintenance plan based on your response to treatment.

Ready to Commit to Better Mental Health?

Don't let the time commitment hold you back. 6 weeks can change the rest of your life. Contact us today to see if TMS therapy in Palm Springs, CA is right for you.

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