How Long Does TMS Take to Work? What to Expect During Treatment

Content Medically Reviewed By: Dr. Robbie Westerman, DNP-PMHNP – Chief Medical Officer

If you are considering transcranial magnetic stimulation (TMS), one of the first questions you may have is how long it takes to start feeling better. The answer varies, but many patients begin noticing early improvements after a few weeks of consistent treatment. Others may need the full initial treatment course before they experience meaningful relief.

Transcranial magnetic stimulation (TMS) is a noninvasive treatment that uses magnetic pulses to stimulate areas of the brain involved in mood regulation. It is most commonly used for major depressive disorder, particularly when antidepressant medications, talk therapy, or other treatments have not provided adequate relief.

At our Phoenix clinic, TMS therapy is one component of a comprehensive approach to mental health care. Your treatment plan may include TMS, psychiatry services, medication management, outpatient mental health treatment, or complementary therapies based on your symptoms, diagnosis, and goals.

If you have questions about whether TMS may be right for you, our team can help you understand your options and review your insurance benefits. Call (480) 631-9623 to speak with our team or verify your insurance benefits.

TMS therapy is a form of brain stimulation that uses an electromagnetic coil, often called a magnetic coil, to deliver repeated magnetic pulses to targeted brain regions. These pulses are designed to influence brain activity and stimulate nerve cells involved in mood control, emotional regulation, and brain function.

Repetitive transcranial magnetic stimulation, also called repetitive TMS or rTMS treatment, is often used for major depressive disorder and treatment-resistant depression. According to the National Institute of Mental Health, repetitive transcranial magnetic stimulation uses an electromagnet to deliver repeated pulses that stimulate targeted areas of the brain.

TMS does not require surgery, sedation, or general anesthesia. Most patients remain awake during treatment and can return to normal activities after each session.

At our Phoenix clinic, TMS may be part of care planning for people exploring TMS for depression, TMS-related support for anxiety symptoms, or TMS for OCD when clinically appropriate.

Many patients begin noticing early improvements after two to four weeks of consistent TMS treatment. Some people experience subtle symptom improvements earlier, while others may need the full acute phase before they experience meaningful relief.

A typical TMS treatment plan often includes multiple sessions per week over several weeks. The exact schedule depends on the condition being treated, the device or protocol used, and your provider’s recommendation. rTMS systems used for certain patients with major depressive disorder are regulated as Class II medical devices by the FDA.

Your timeline may depend on several factors, including:

• Your diagnosis
• The severity of your depression symptoms
• Whether symptoms are mild, moderate, or severe
• How long your symptoms have been present
• Prior response to antidepressant medication
• Whether you have treatment-resistant depression
• Whether anxiety, OCD, PTSD, bipolar disorder, or other mental health conditions are also part of your history
• How consistently you attend treatment sessions
• Whether TMS is combined with talk therapy, medication management, or other treatments

If you are still comparing your options, our guide to TMS vs traditional treatments explains how TMS differs from medication, therapy, and electroconvulsive therapy.

TMS therapy is designed to work gradually. During each session, magnetic pulses target specific brain regions involved in mood regulation, including the dorsolateral prefrontal cortex. This area plays a role in mood regulation, motivation, focus, and emotional control.

Over time, repeated stimulation may support changes in brain activity and the way mood-related brain networks communicate. In simple terms, TMS is not meant to “flip a switch” after one appointment. It is a cumulative treatment that may help the brain gradually regulate mood more effectively.

This is why consistency matters. If you miss multiple sessions, your provider may need to adjust the schedule or treatment plan. Following the recommended schedule gives your brain repeated stimulation during the intended acute phase of care.

Your first treatment is usually longer than later sessions because it includes setup, mapping, and calibration. Your provider or a trained TMS specialist will identify the treatment area and determine the stimulation level that is appropriate for you.

During the first treatment, you may notice:

• A tapping sensation on the scalp
• Clicking sounds from the TMS device
• Mild scalp discomfort
• Slight movement in facial muscles
• A feeling of pressure or pulsing near the treatment area
• No immediate change in symptoms

Not feeling better after the first treatment is common. TMS outcomes are usually evaluated across the full treatment plan, not after one session.

The initial signs of TMS response can be subtle. Some patients notice small changes before they experience major symptom relief.

Common signs that TMS may be starting to help include:

• Improved mood
• Increased energy
• Better sleep
• Less emotional discomfort
• More motivation
• Fewer negative thought loops
• Better focus
• Less difficulty completing daily tasks
• Reduced intensity of depressive symptoms
• More interest in normal routines or relationships

Some patients notice emotional changes first. Others notice physical or functional changes, such as getting out of bed more easily or completing daily tasks with less effort. These early improvements do not guarantee complete remission, but they may suggest that treatment is beginning to support mood regulation.

Some patients may notice temporary emotional discomfort early in treatment, although this does not happen for everyone. It may feel like increased tiredness, frustration, irritability, or emotional sensitivity.

If anxiety or depression feels worse during treatment, tell your provider. Your care team can review your settings, treatment schedule, sleep, stress, medication changes, and overall response. Temporary discomfort does not always mean TMS is not working, but it should be monitored.

You should also tell your provider if you have a history of bipolar disorder, manic episodes, seizures, traumatic brain injury, or other medical concerns that could affect your treatment plan.

After the initial treatment course, your provider may discuss a continuation phase, maintenance sessions, or booster sessions if symptoms return. Not everyone needs ongoing TMS, but some patients benefit from follow-up care to help maintain progress.

Your post-treatment plan may include:

• Follow-up appointments
• Medication management
• Talk therapy
• Complementary therapies
• Lifestyle support
• Maintenance sessions
• Booster sessions if symptoms return
• Outpatient mental health treatment if more structure is needed

Some patients remain stable after the acute phase, while others need additional support. Your provider will help determine what makes sense based on your symptoms, response, and long-term goals.

Not every patient responds to TMS in the same way. If you do not notice meaningful improvement after the initial treatment course, your provider may review your diagnosis, treatment schedule, medication history, sleep, stress, and other factors that can affect mood.

In some cases, your care plan may include continued psychiatry support, medication management, talk therapy, maintenance sessions, or another level of outpatient mental health treatment. The goal is to understand your response and adjust your care plan based on your needs, rather than assuming one treatment should work the same way for everyone.

TMS is often considered for treatment-resistant depression, especially when traditional antidepressant medications have not provided enough relief or have caused difficult side effects.

Many patients consider TMS after medications, therapy, or other treatment approaches have not provided adequate relief. Others have tried talk therapy, medication combinations, or other treatments and still experience ongoing depression symptoms. Federal regulations define rTMS systems as external devices that deliver repetitive pulsed magnetic fields to targeted areas of the brain for certain patients with major depressive disorder.

TMS is not right for everyone, so evaluation with a mental health professional is important before starting treatment.

TMS is generally well tolerated. Common side effects are usually mild and temporary.

Possible side effects include:

• Mild headaches
• Scalp discomfort
• Tapping sensation during treatment
• Mild facial muscle twitching
• Temporary fatigue
• Temporary emotional discomfort

Serious side effects are rare, but screening is important. Tell your provider if you have metal implants near the head or neck, cochlear implants, a seizure history, traumatic brain injury, bipolar disorder, or other medical concerns before starting treatment.

According to the Cleveland Clinic, TMS is a noninvasive treatment that does not require surgery or sedation and is generally well tolerated, with side effects that are typically mild and temporary.

If you are wondering how long TMS takes to work, it is important to understand that results often develop gradually over the course of treatment. Some patients notice early improvements within a few weeks, while others need more time before they experience meaningful relief.

At our Phoenix clinic, we can help you understand whether TMS is appropriate, what to expect during treatment, and how it may fit into your broader mental health plan.

Call (480) 631-9623 to speak with our team or verify your insurance benefits to take the next step.

• Cleveland Clinic. (n.d.). Transcranial magnetic stimulation (TMS). https://my.clevelandclinic.org/health/treatments/17827-transcranial-magnetic-stimulation-tm
• National Institute of Mental Health. (n.d.). Brain stimulation therapies. U.S. Department of Health and Human Services, National Institutes of Health. https://www.nimh.nih.gov/health/topics/brain-stimulation-therapies/brain-stimulation-therapies
• Repetitive Transcranial Magnetic Stimulation System, 21 C.F.R. § 882.5805 (2026). https://www.ecfr.gov/current/title-21/chapter-I/subchapter-H/part-882/subpart-F/section-882.5805
• U.S. Food and Drug Administration. (2011). Class II special controls guidance document: Repetitive transcranial magnetic stimulation (rTMS) systems; guidance for industry and FDA staff. U.S. Department of Health and Human Services. https://www.fda.gov/medical-devices/guidance-documents-medical-devices-and-radiation-emitting-products/repetitive-transcranial-magnetic-stimulation-rtms-systems-class-ii-special-controls-guidance