Ketamine Therapy vs TMS: Comparing Two Breakthrough Treatments

Two Different Approaches to a Stubborn Problem

Ketamine therapy vs TMS comes down to speed, mechanism, and how much of your day the treatment can take up. Ketamine therapy acts on the brain's glutamate system and can ease depression symptoms within hours, but it requires a support person and an altered state of consciousness during each session. Transcranial magnetic stimulation (TMS), a non-invasive treatment that uses magnetic pulses to stimulate mood-regulating brain regions, keeps you fully alert and lets you drive yourself home, but it typically takes four to six weeks of daily sessions to build results. Both are legitimate options for people who haven't found relief from standard antidepressants, and both have strong evidence behind them for treatment-resistant depression. This comparison breaks down how each treatment works, what a session feels like, how fast they act, what they cost, and which situations tend to favor one over the other.

How Each Treatment Works

Ketamine Therapy

Ketamine is an NMDA receptor antagonist that works through the brain's glutamate system rather than the serotonin or norepinephrine pathways targeted by conventional antidepressants. Blocking NMDA receptors triggers a burst of glutamate activity that appears to promote rapid neuroplasticity, the brain's ability to form new neural connections. Ketamine can be delivered as an IV infusion, the FDA-approved nasal spray Spravato (esketamine), sublingual tablets, or intramuscular injection. For a closer look at how the two most common forms compare, see our ketamine vs esketamine comparison. During treatment, you'll experience a dissociative state, often described as dreamlike or floating, and effects from a single session can sometimes be felt within hours.

Transcranial Magnetic Stimulation (TMS)

TMS uses focused magnetic pulses to stimulate the left dorsolateral prefrontal cortex, a brain region tied to mood regulation. The pulses pass through the skull and generate small electrical currents that activate neurons in the targeted area. The Mayo Clinic explains that TMS is non-invasive, does not involve medication, and does not require sedation. You remain seated, fully awake, and alert throughout each session, with no altered state of consciousness at any point. The NIMH's overview of brain stimulation therapies covers how TMS compares to other neuromodulation approaches.

What the Treatment Experience Is Like

During Ketamine Therapy

A ketamine session looks different depending on the administration route, but every route shares an altered state of awareness. During an IV infusion, you recline in a chair for about 40 minutes while the medication runs through the line. Floating sensations, visual changes, a sense of detachment from your body, and dreamlike thoughts are common. Some patients describe the experience as profound; others find it unusual but manageable. You'll need a recovery period afterward and won't be able to drive yourself home. For more on what a full session involves, see how long a ketamine session lasts.

During TMS

A TMS session feels very different. You sit upright while a magnetic coil is positioned near your head, and you'll hear clicking sounds and feel a tapping sensation on your scalp. Most patients adjust to this within the first few sessions. You stay fully alert and cognitively intact the entire time, with no sedation and no recovery period needed. Many patients drive themselves to and from appointments and return to work immediately afterward.

Treatment Timeline

Ketamine

A standard ketamine series involves six sessions over two to three weeks. Many patients notice some improvement within the first few sessions, with more significant effects showing by the end of the initial series. After that, maintenance sessions are typically scheduled every few weeks to once a month. Our maintenance treatment guide covers how that schedule is usually set.

TMS

TMS asks for a bigger upfront time commitment: daily sessions Monday through Friday for four to six weeks, or roughly 20 to 36 sessions total, each lasting 20 to 40 minutes. Newer accelerated protocols, like Stanford Neuromodulation Therapy (SNT), compress this into about five days, though availability varies by clinic. Results tend to build gradually, with many patients noticing improvement around weeks three or four.

Effectiveness for Suicidal Ideation and Anxiety

Response speed is where the two treatments diverge most. Ketamine's rapid onset, sometimes within hours, gives it a distinct advantage for acute suicidal ideation, a use case where TMS's gradual buildup over weeks isn't fast enough to help in a crisis. TMS may still reduce suicidal thoughts over a full treatment course, but it isn't a crisis intervention the way ketamine can be.

Neither treatment has FDA approval specifically for anxiety disorders, but evidence for both is growing. Many ketamine patients report meaningful anxiety reduction alongside mood improvement, and some TMS protocols now target anxiety-related brain circuits specifically. If anxiety is your primary concern, ask your provider what evidence supports either option for your specific symptoms.

Side Effects

Ketamine Side Effects

• Dissociation during sessions
• Nausea (often 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
• Rare risk of seizure, reported in less than 0.1 percent of patients

TMS side effects are generally milder and don't require a recovery period. Ketamine side effects are more noticeable during treatment but are temporary. Our side effects and safety guide covers what to expect and when to call your provider.

Cost and Insurance

Generic IV ketamine costs $400 to $800 per session, putting an initial six-session series at roughly $2,400 to $4,800. Insurance rarely covers generic IV ketamine. Spravato, the FDA-approved esketamine nasal spray, is more likely to be covered, with copays that can range from $0 to $200 per session depending on your plan.

A full TMS course typically runs $6,000 to $12,000, but TMS has FDA clearance for treatment-resistant depression and most major insurance plans cover it, which often brings out-of-pocket costs down significantly. Before starting either treatment, ask your provider's billing team for a written estimate and confirm what your specific plan covers, since coverage details vary by insurer and by state.

Can You Do Both?

Some patients and providers explore combining ketamine and TMS, either at the same time or in sequence. One common approach uses ketamine first for rapid stabilization, then TMS for longer-term consolidation; another uses TMS as the primary treatment with ketamine reserved for acute episodes. Research on combination protocols is still limited, but interest in the approach is growing in the clinical community. If you're considering both, talk to a provider experienced in each modality, and see our guide on questions to ask a ketamine provider for how to evaluate continuity of care across treatments.

Which Treatment Might Be Right for You?

Ketamine Therapy May Fit Better If You:

• Need rapid relief, particularly for severe depression or suicidal ideation
• Cannot commit to daily sessions for four to six weeks
• Are open to a treatment that involves an altered state of consciousness

TMS May Fit Better If You:

• Prefer a non-medication approach and want to remain fully alert during treatment
• Need to return to work or other responsibilities immediately after each session
• Have insurance that covers TMS but not IV ketamine
• Are uncomfortable with the idea of a dissociative experience

Both treatments are legitimate options beyond traditional antidepressants. Talk with your provider about your symptoms, your practical constraints, and your personal preferences. See our comparison of ketamine vs ECT if electroconvulsive therapy is also on your list of options.