Ketamine Therapy vs TMS: Comparing Two Breakthrough Treatments

Two Different Approaches to a Stubborn Problem

When traditional antidepressants have not provided the relief you need, two of the most promising alternatives available today are ketamine therapy and transcranial magnetic stimulation (TMS). Both represent genuine breakthroughs in mental health treatment, and both have helped people who felt stuck after trying medication after medication without success.

But ketamine therapy and TMS work in fundamentally different ways, come with different experiences, and fit different situations. Understanding how they compare can help you have a productive conversation with your provider about which path might be right for you.

How Each Treatment Works

Ketamine Therapy

Ketamine works primarily through the brain's glutamate system, modulating NMDA receptors in a way that promotes rapid neuroplasticity — essentially helping your brain form new neural connections. This mechanism is distinct from conventional antidepressants, which target serotonin, norepinephrine, or dopamine. Ketamine can be administered as an IV infusion, a nasal spray (Spravato), sublingual tablets, or intramuscular injection.

The effects of a single ketamine session can sometimes be felt within hours. During the treatment itself, you will experience altered consciousness — a dissociative state that many patients describe as dreamlike or floating.

Transcranial Magnetic Stimulation (TMS)

TMS uses focused magnetic pulses to stimulate specific areas of the brain associated with mood regulation, particularly the left dorsolateral prefrontal cortex. The magnetic pulses pass through the skull and generate small electrical currents that activate neurons in the targeted region.

TMS is non-invasive and does not involve any medication. You sit in a chair while a device is positioned against your head, and you remain fully awake and alert throughout the session. There is no altered state of consciousness.

What the Treatment Experience Is Like

During Ketamine Therapy

A ketamine session varies depending on the administration route, but the common thread is an altered state of awareness. During an IV infusion, you will recline in a comfortable chair for about 40 minutes while the medication flows through your IV line. You may experience floating sensations, visual changes, a sense of detachment from your body, or dreamlike thoughts. The experience can be profound for some patients and unusual but manageable for others.

After the session, you will need a recovery period and will not be able to drive yourself home. Most people take it easy for the rest of the day.

During TMS

A TMS session feels quite different. You sit upright in a chair while a magnetic coil is positioned near your head. You will hear clicking sounds and feel a tapping sensation on your scalp. Some patients find this mildly uncomfortable at first, though most adjust within the first few sessions.

The key difference: you are fully alert and cognitively intact throughout. There are no changes in consciousness, no sedation, and no need for a recovery period. Many patients drive themselves to and from sessions and return to normal activities immediately afterward.

Treatment Timeline

Ketamine

The initial treatment series for ketamine typically involves six sessions over two to three weeks. Many patients notice some improvement within the first few sessions, and significant effects often become apparent by the end of the initial series. After the initial phase, maintenance sessions are scheduled as needed — commonly every few weeks to once a month.

TMS

TMS requires a larger initial commitment. A standard TMS course involves daily sessions (Monday through Friday) for four to six weeks — roughly 20 to 36 sessions total. Each session lasts about 20 to 40 minutes. Newer accelerated protocols, like Stanford Neuromodulation Therapy (SNT), compress the timeline into five days, but availability of these protocols varies.

Results from TMS typically build gradually over the course of treatment, with many patients noticing improvement around weeks three or four.

Effectiveness

For Depression

Both treatments have strong evidence for depression, particularly treatment-resistant depression.

Ketamine IV infusion has shown response rates of approximately 60 to 70 percent in clinical studies of treatment-resistant depression, with some patients experiencing relief within hours of their first session. The speed of response is one of ketamine's most distinctive advantages.

TMS has demonstrated response rates of approximately 50 to 60 percent, with remission rates around 30 to 35 percent. These results are meaningful, especially considering that these patients had already failed multiple medication trials.

For Suicidal Ideation

Ketamine has a notable advantage in treating acute suicidal ideation. Its rapid onset — sometimes within hours — makes it uniquely valuable in urgent situations. TMS does not work quickly enough to address acute suicidal crises, though it may reduce suicidal thoughts over the course of a full treatment series.

For Anxiety

Both treatments have shown promise for anxiety, though neither has an FDA approval specifically for anxiety disorders. The evidence for ketamine's effects on anxiety is growing, and many patients report meaningful anxiety reduction alongside improved mood. TMS research for anxiety is also expanding, with some protocols specifically targeting anxiety-related brain circuits.

Side Effects

Ketamine Side Effects

• Dissociation during sessions
• Nausea (manageable with anti-nausea medication)
• Dizziness and lightheadedness
• Temporary increases in blood pressure
• Drowsiness and fatigue after sessions
• Inability to drive for the rest of the day

TMS Side Effects

• Scalp discomfort or pain at the treatment site (usually improves over sessions)
• Headache after sessions
• Lightheadedness
• Tingling sensation in the face or scalp
• Very rare risk of seizure (less than 0.1 percent)

TMS side effects are generally milder and do not require a recovery period. Ketamine side effects are more noticeable during treatment but are temporary.

Cost and Insurance

Ketamine

Generic IV ketamine costs $400 to $800 per session, with an initial series costing $2,400 to $4,800. Insurance coverage for generic ketamine is rare. Spravato (the FDA-approved nasal spray form) is more likely to be covered by insurance, with copays ranging from $0 to $200 per session.

TMS

A full course of TMS typically costs $6,000 to $12,000. However, TMS has FDA clearance for treatment-resistant depression, and most major insurance plans cover it. Out-of-pocket costs with insurance vary but are often significantly lower than the full price.

Practical Considerations

Can You Do Both?

Some patients and providers explore combining ketamine and TMS, either simultaneously or sequentially. For example, ketamine might be used first for rapid stabilization, followed by TMS for longer-term consolidation. Or TMS might be the primary treatment, with ketamine used for acute episodes.

There is limited research on combination protocols, but the concept is gaining interest in the clinical community. If you are considering both, discuss this with a provider experienced in both modalities.

Which Treatment Might Be Right for You?

Ketamine therapy may be the better fit if you need rapid relief, particularly if you are experiencing severe depression or suicidal ideation. It is also a strong option if you cannot commit to daily sessions for several weeks, or if you are open to a treatment that involves an altered state of consciousness.

TMS may be the better fit if you prefer a non-medication approach, want to remain fully alert during treatment, need to return to work or responsibilities immediately after each session, or your insurance covers TMS. It is also a good option if you are uncomfortable with the idea of dissociative experiences.

Both treatments represent meaningful options beyond traditional antidepressants. Talk with your provider about your symptoms, your practical constraints, and your personal preferences. The right choice is the one that fits your life and gives you the best chance at lasting improvement.

References

• NIMH: Brain Stimulation Therapies — NIMH overview of brain stimulation therapies including TMS and how they work
• Mayo Clinic: Transcranial Magnetic Stimulation (TMS) — Mayo Clinic comprehensive guide to TMS, including effectiveness and what to expect
• NIMH: Cracking the Ketamine Code — NIMH feature on ketamine's mechanism of action and how it differs from other depression treatments
• Mayo Clinic: Treatment-Resistant Depression — Mayo Clinic overview of treatment options including both TMS and ketamine