Two leading options for hard-to-treat depression compared: how they work, FDA status, speed, cost, insurance, and side effects.
Choosing between ketamine vs TMS for depression can feel confusing. Both treatments help people whose depression has not improved with standard antidepressants. But they work in very different ways, cost different amounts, and carry different risks. This guide compares them side by side so you can talk to your doctor with confidence.
Here is a fast, side-by-side look at the main differences. Details and sources follow below.
| Factor | Ketamine | TMS (transcranial magnetic stimulation) |
|---|---|---|
| How it works | A medicine that blocks the NMDA glutamate receptor in the brain. Given as a nasal spray (Spravato), IV, IM, or oral lozenge. | A device that sends magnetic pulses through the scalp to stimulate mood-related brain areas. No drug enters your body. |
| FDA status | Esketamine (Spravato) is FDA-approved for treatment-resistant depression (2019). IV/IM ketamine is off-label. Ketamine is a Schedule III drug.2 | FDA-cleared for major depression since 2008. It is a medical device, not a scheduled drug. SAINT accelerated protocol cleared in 2022.35 |
| Time per course | Spravato: twice weekly for the first month, then tapering. IV: often 6 infusions over 2–3 weeks, then maintenance. Each visit lasts ~1–2 hours. | Standard course is about 36 sessions, given 5 days a week for roughly 6 weeks. Each session lasts ~20–40 minutes.1 |
| Speed of response | Fast. Many people feel relief within hours to a few days.4 | Slow. Most people notice change after 3–6 weeks. SAINT can work in days for some patients.5 |
| Evidence & remission | Strong short-term antidepressant effect; durability needs repeat dosing. Spravato is backed by Phase 3 maintenance trials.2 | Well-studied; standard TMS helps a meaningful share of patients. SAINT trial reported ~79% remission in 5 days vs ~13% sham.5 |
| Cost & insurance | Spravato is often covered after failed meds (REMS office visit required). IV ketamine ($400–$800/session) is rarely covered for depression. | Widely covered by insurance and Medicare after you fail two or more antidepressants. Out-of-pocket courses can run several thousand dollars.6 |
| Side effects | Short-term dissociation, raised blood pressure, nausea, dizziness. Bladder problems and abuse risk with heavy long-term use. | Scalp discomfort, headache, and facial twitching during sessions. Rare seizure risk. No systemic drug effects.1 |
Ketamine works on the brain's glutamate system. It blocks the NMDA receptor, which seems to spark fast changes in mood and brain connections. This is a different target than older antidepressants, which act on serotonin over many weeks.
You can get ketamine in several forms. Spravato (esketamine) is a nasal spray you take in a certified office under observation. IV and IM ketamine are given off-label in clinics. Some telehealth programs prescribe at-home lozenges. To learn more, read our full ketamine therapy guide.
TMS stands for transcranial magnetic stimulation. A coil placed against your head sends magnetic pulses into a brain region tied to mood. No medicine enters your body. You stay awake and can drive yourself home after each session.
The standard course runs about 36 sessions over six weeks, five days a week.1 Newer accelerated protocols pack more stimulation into fewer days. The SAINT protocol, FDA-cleared in 2022, uses brain imaging to target each person and can work within a week for some patients.5
Because TMS does not use a drug, side effects stay near the scalp. Most people feel mild discomfort or a tapping sensation during treatment. Seizures are very rare. There is no dissociation and no abuse risk.
Ketamine is the faster of the two. Many people feel relief within hours to a few days of their first dose.4 That speed makes ketamine useful in a crisis, such as severe depression with suicidal thoughts.
Standard TMS works more slowly. Most people see change after three to six weeks of daily sessions. The accelerated SAINT protocol narrows that gap and can help within days, but it is not yet available everywhere.5
Cost is often the deciding factor. Here is how the two compare.
To map your options by cost, coverage, and speed, try our depression treatment path tool. It compares Spravato, IV ketamine, TMS, and other routes for your situation.
Yes, in many cases you can. Some clinics combine TMS and ketamine, and others use one after the other when the first does not fully work. The two treatments target different brain systems, so they may add up.
That said, evidence on combining them is still early. Always coordinate with a psychiatrist who manages both. Never start a second treatment on your own without medical guidance.
Both treatments have real research behind them, but the studies look different. Knowing the strengths and gaps helps you set fair expectations.
The first major finding came in 2000, when researchers showed a single low dose lifted depression within hours.4 Dozens of trials have since confirmed a strong short-term effect. The open question is durability. A single dose usually fades within days, so most programs use repeat dosing to hold the benefit.
Spravato earned FDA approval after Phase 3 maintenance trials showed repeat dosing cut relapse.2 That is why it follows a set schedule rather than a one-time visit.
Standard TMS rests on multisite randomized trials going back to its 2007 pivotal study and 2008 FDA clearance.1 It helps a meaningful share of people who have failed medications, though remission rates in early trials were modest.
The accelerated SAINT protocol changed the picture. In its 2022 controlled trial, about 79% of patients reached remission after five days, versus roughly 13% on sham.5 These results are promising but come from a small study, so wider data is still building.
Your symptoms and life situation matter as much as the research. Use these profiles as a starting point for a talk with your doctor.
Not sure where you fall? The depression treatment path tool walks you through these factors step by step.
There is no single winner in the ketamine vs TMS debate. The right choice depends on your needs, your budget, and your insurance.
Whichever you choose, pair it with therapy and follow-up care. Good outcomes depend on support, not the treatment alone. See our integration therapy guide for what that support looks like.
Neither is universally better. Ketamine works faster, often within hours to days, which helps in a crisis. TMS is drug-free and widely covered by insurance after failed medications, but it works more slowly over several weeks. The right choice depends on your symptoms, budget, and insurance, so decide with a psychiatrist.
TMS is widely covered by insurance and Medicare after you fail two or more antidepressants; out-of-pocket courses can run several thousand dollars. Spravato (esketamine) is often covered because it is FDA-approved for treatment-resistant depression, though it must be given in a certified office. IV ketamine is usually paid out of pocket at about $400 to $800 per session and is rarely covered for depression.
Often yes. Some clinics combine TMS and ketamine, and others use one after the other when the first treatment only partly works. The two target different brain systems, so they may add up. Evidence on combining them is still early, so always coordinate the plan with a psychiatrist who manages both.
Ketamine works faster. Many people feel relief within hours to a few days of the first dose, which is why it is used for severe depression with suicidal thoughts. Standard TMS usually takes three to six weeks. The accelerated SAINT TMS protocol can work within days for some patients but is not yet available everywhere.
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