Ketamine Therapy for Depression: A Complete Guide (2026)

Most people don’t search for ketamine therapy for depression on a good day.

Usually, it happens after a long stretch of feeling emotionally worn down. Not dramatic movie-scene sadness. More like waking up tired of carrying your own mind around.

A lot of patients who eventually look into ketamine treatment for depression have already done everything they were told to do. Therapy. Medication changes. Higher dosages. Lower dosages. Waiting six weeks. Then another six.

And after a while, something frustrating starts happening.

People stop asking, “Why am I depressed?” and start asking, “What if this is just who I am now?”

That hopelessness is hard to explain unless you’ve seen it up close. It’s also exactly why ketamine therapy became such a serious topic in psychiatry over the last several years — and why this guide exists. We’ll cover what ketamine therapy for depression actually is, how it works in the brain, what the different types are, what treatment looks like in practice, and what’s genuinely available to you today.

What Is Ketamine Therapy for Depression?

Ketamine therapy uses ketamine-based medication to help people dealing with severe or treatment-resistant depression. It works through a completely different mechanism than every antidepressant that came before it — which is the core reason it helps patients that standard medications have failed.

A Brief History of Ketamine in Medicine

Ketamine itself isn’t new. Doctors have used it in hospitals for decades, primarily as a surgical anaesthetic and emergency pain medication. Mental health researchers became interested much later, after patients started describing unexpected mood changes following ketamine procedures during surgeries in the 1990s.

Not happiness, exactly. That word comes up less than people think. Patients often described something quieter — a little mental relief, a little less emotional pressure. For people who had spent years feeling mentally pinned down by depression, even that felt significant. It prompted researchers to look more closely.

Formal clinical research into ketamine for depression accelerated through the 2000s and 2010s, leading to the FDA’s landmark approval of esketamine (Spravato®) in March 2019 — the first new class of antidepressant approved in over 35 years.

How Ketamine Is Used for Depression Today

Today, ketamine for treatment-resistant depression is usually offered in three ways: IV ketamine infusions, oral ketamine, and Spravato® (esketamine nasal spray). Spravato® is the only FDA-approved ketamine-based depression treatment in the United States — and the only one covered by most major insurance plans. Many people searching for a “ketamine clinic near me” don’t realise there is a significant difference between off-label ketamine treatment and FDA-approved esketamine care, both clinically and financially.

Ketamine vs Traditional Antidepressants: The Key Difference

Most antidepressants work through serotonin systems. Ketamine works through the glutamate NMDA receptor pathway instead — a mechanism connected to learning, memory, emotional processing, and the brain’s capacity to form new neural connections.

For some patients, the difference feels noticeable quickly.

One patient described it as: “My brain finally stopped arguing with itself for a few hours.”

That doesn’t sound dramatic. But for someone living with constant mental exhaustion, it can feel enormous.

How Does Ketamine Work in the Brain?

The NMDA Receptor Explained Simply

You’ll come across the phrase “NMDA receptor” a lot while researching ketamine therapy. Most people immediately stop reading at that point. Fair.

The simpler version: ketamine blocks the NMDA glutamate receptor, which triggers a rapid cascade of downstream effects — including the release of brain-derived neurotrophic factor (BDNF), a protein that promotes the growth of new synaptic connections in mood-regulating brain regions. It is this process — rapid synaptogenesis — that appears to underlie ketamine’s fast antidepressant effect.

Neuroplasticity and Rapid Synapse Growth

Researchers talk a lot about neuroplasticity — the brain’s ability to adapt and form new connections. Long-term depression can make thought patterns feel painfully fixed. Same fears. Same heaviness. Same emotional numbness every morning.

Clinical research published in Science and in Nature Neuroscience has shown that ketamine promotes rapid synapse growth in the prefrontal cortex within hours of administration — a structural change associated with antidepressant response. This is the biological basis for the speed that makes ketamine therapy so different from everything that came before it.

Some patients say ketamine doesn’t suddenly make them happy. It just makes them feel reachable again.

Why It Works When SSRIs and SNRIs Don’t

The STAR*D study — the largest antidepressant effectiveness trial ever conducted — found that after two failed antidepressant medications, the probability of achieving remission with a third or fourth drops to roughly 10 to 20 percent. For that population, continuing to repeat the same serotonin-targeting approach is not neutral — it has an emotional and practical cost.

Ketamine matters because it approaches the brain’s chemistry through a completely different pathway. It is not a stronger version of what already failed. It is something mechanistically different.

Who Is Ketamine Therapy For?

Defining Treatment-Resistant Depression

Treatment-resistant depression (TRD) clinically means a diagnosis of major depressive disorder that has not responded adequately to at least two antidepressant medications taken at a therapeutic dose for a sufficient duration — typically a minimum of six weeks each. Not partial relief. Not “slightly better.” Adequate clinical response.

Approximately one in three people with depression meets this definition. That is a substantial population, and Spravato® was specifically developed and FDA-approved to serve them.

Other Conditions Ketamine Can Help With

Depending on the patient and psychiatric evaluation, ketamine-assisted therapy may also help with PTSD, anxiety disorders, bipolar depression, and acute suicidal ideation. Spravato® has a second FDA-approved indication specifically for major depressive disorder in adults who are experiencing active suicidal thoughts with intent — where its speed of effect is particularly valuable.

Who Should Not Take Ketamine Therapy

Ketamine therapy is not appropriate for everyone. Patients with a history of psychosis or schizophrenia, uncontrolled cardiovascular conditions, active substance use disorder, or certain medication combinations require individual evaluation and may need different treatment approaches. This is why legitimate clinics screen patients carefully before treatment begins.

Types of Ketamine Treatment Available

IV Ketamine Infusion Therapy

IV ketamine is commonly offered through private clinics across the United States and can be effective for treatment-resistant depression. It is administered intravenously over approximately 40 to 60 minutes. However, it is technically an off-label treatment — ketamine was approved as an anaesthetic, not as an antidepressant — and it is generally not covered by insurance. Costs typically run $400 to $800 per session, with a standard acute course involving six sessions.

Spravato® (Esketamine Nasal Spray): The FDA-Approved Option

Spravato® was the first FDA-approved psychedelic-based therapy for depression, and it changed the treatment landscape in two important ways. First, it went through the full FDA approval process specifically for treatment-resistant depression, which means it can be prescribed and billed for that indication. Second, it is covered by most major insurance plans — which makes it financially accessible in a way that IV ketamine is not for the majority of patients.

It is self-administered as a nasal spray in two doses at the start of each session, under clinical supervision, in a certified REMS-approved facility. The REMS (Risk Evaluation and Mitigation Strategy) programme exists specifically to ensure it is only administered in settings that meet FDA safety requirements.

Oral Ketamine: What You Need to Know

Some clinics prescribe oral ketamine or ketamine lozenges for at-home use. Supervision standards vary significantly depending on the provider, and oral ketamine is not FDA-approved for depression. For patients seeking structured, clinically monitored treatment with insurance coverage, Spravato® is typically the more appropriate option.

Which Type Is Right for You?

There isn’t one universal answer. The right option depends on your symptoms, medical and psychiatric history, insurance coverage, and what you have already tried. A clinical consultation is the most direct way to determine which approach fits your situation.

What Does a Ketamine Therapy Session Look Like?

Before Your Session: What to Prepare

Most clinics begin with a psychiatric evaluation, medical screening, insurance verification, and treatment planning. You should avoid eating for at least two hours before a Spravato® session. You will need someone to drive you home — you cannot drive on the day of treatment.

At Marpa Minds, the clinical team also helps patients navigate insurance paperwork directly. That support matters because depression has a way of making ordinary administrative tasks feel strangely overwhelming.

During the Session: What You Will Experience

A Spravato® session is usually quiet. Some patients close their eyes the whole time. Some listen to music. Some barely talk afterwards because the experience feels difficult to put into words immediately.

The nasal spray is administered in two doses, five minutes apart, at the start of the session. Within a few minutes, most patients begin to notice a shift — a sense of calm, mild dissociation, or altered perception that typically peaks within the first 40 minutes and resolves by the end of the monitoring period.

At Marpa Minds, sessions take place in private spa-like treatment rooms with zero-gravity recliners and calming sensory environments. That detail sounds small until you meet patients who already associate healthcare settings with stress, disappointment, or emotional exhaustion.

After the Session: What to Expect

Some patients notice changes relatively quickly — sometimes after the first or second session. Others take longer. That uncertainty can feel emotionally complicated, especially for people who have already spent years hoping the “next treatment” would finally help. It is worth knowing that response timelines vary, and a lack of dramatic effect after one session does not mean treatment isn’t working.

How Many Sessions Will You Need?

The standard acute treatment course for Spravato® involves twice-weekly sessions for four weeks — eight sessions total. After the acute phase, sessions typically reduce to once weekly for four weeks and then to a personalised maintenance schedule. Many patients continue periodic maintenance sessions over time to sustain improvement and reduce relapse risk. Others improve enough that treatment becomes progressively less frequent.

How Quickly Does Ketamine Therapy Work?

Ketamine vs Antidepressants: Speed of Effect

Traditional antidepressants typically require four to eight weeks before patients notice meaningful improvement. Ketamine therapy can work significantly faster — sometimes within hours of the first session. This is not a minor clinical detail. For patients in acute distress, or those who have been waiting years for relief, the difference in timeline can be genuinely significant.

Clinical trials for Spravato® showed statistically significant reductions in depression symptom scores within 24 hours of the first dose. That speed of response is without precedent in the history of antidepressant medicine.

What Results Look Like After Week 1 and Week 4

One thing patients describe surprisingly often after early ketamine therapy is not excitement. It’s quiet. Their thoughts feel less aggressive. Less relentless. Less exhausting to sit with all day. For many people living with chronic depression, that sense of mental space — even if partial at first — can feel genuinely life-changing.

By the end of the four-week acute course, many patients report meaningful improvement in mood, energy, and daily functioning. Response is not universal, but the response rates are substantially higher than those seen with additional antidepressant trials in TRD populations.

Long-Term Outcomes and Maintenance

“What we see at Marpa Minds is that ketamine therapy often gives patients something that years of antidepressants didn’t — not just symptom improvement, but the mental space to actually engage with their own recovery. For many of them, that’s the first time in years they’ve felt like that was even possible.” — Amy Della Rocca, MSN, MPH, PMHNP-BC, Clinical Director, Marpa Minds

Some patients continue periodic maintenance sessions to sustain improvement. Others achieve sufficient stability that sessions become infrequent or no longer necessary. The individual trajectory varies, and treatment plans are adjusted over time based on response.

Is Ketamine Therapy Safe?

Common Side Effects

Possible side effects during a Spravato® session include dizziness, nausea, temporary dissociation, mild increases in blood pressure, and sedation. Almost all of these occur during the session itself and resolve within the two-hour monitoring period before patients leave the clinic. Blood pressure is monitored at regular intervals throughout every session as part of standard REMS protocol.

The Question of Addiction and Dependency

People understandably ask about this. Ketamine has a known potential for misuse in recreational contexts. In structured medical settings with controlled, scheduled dosing under supervision, dependency has not been a significant clinical concern in FDA trial data or post-approval monitoring. The REMS programme was specifically designed to mitigate this risk by ensuring Spravato® is only administered in certified settings.

How Clinical Settings Manage Risk

FDA-approved Spravato® can only be administered in certified REMS healthcare facilities where clinicians and staff meet specific training requirements and where patients are observed for the full monitoring period. This system exists specifically to maintain treatment safety and clinical consistency.

Ketamine Therapy Cost and Insurance Coverage

IV ketamine infusions are typically not covered by insurance and cost between $400 and $800 per session — making a standard acute course of six infusions $2,400 to $4,800 out of pocket.

Spravato® is covered by most major insurance plans because it is FDA-approved for treatment-resistant depression. This includes Blue Cross Blue Shield, Aetna, UnitedHealthcare, Cigna, Humana, and Medicare. Coverage requires a confirmed TRD diagnosis and documentation of at least two failed antidepressant medications. The prior authorisation process is the main administrative step.

At Marpa Minds, we manage the full prior authorisation process on behalf of our patients — handling the paperwork, the communication with insurers, and the eligibility verification before any treatment begins. [For more detail on how Spravato® insurance coverage works, see our full guide on insurance and esketamine treatment.]

Ketamine Therapy for Depression at Marpa Minds — White Plains, NY

Marpa Minds provides FDA-approved Spravato® treatment for adults living with treatment-resistant depression throughout Westchester County, Rockland County, and the New Jersey communities of Mahwah, Ramsey, Saddle River, and Bergen County.

Why Marpa Minds Chose Spravato® Over IV Ketamine

The clinic chose Spravato® because it brings together FDA approval, structured medical oversight, insurance accessibility, and evidence-backed treatment standards. For patients in Westchester County, Rockland County, and across the New York–New Jersey border, it is the most clinically rigorous and financially accessible pathway to ketamine-based depression treatment currently available.

What a Session Looks Like at Our Westchester Clinic

The clinic environment was intentionally designed to feel calm, private, and emotionally supportive rather than cold or clinical. Private rooms, zero-gravity recliners, a welcoming atmosphere, and a clinical team that stays present throughout every session. That difference matters more than many patients expect before beginning treatment — particularly those who already associate healthcare settings with disappointment.

Serving Westchester, Rockland County, and NJ Patients

Many patients arriving at our White Plains clinic have spent years trying different treatment approaches before considering ketamine therapy. By that stage, most people aren’t looking for hype. They’re looking for relief that finally feels believable.

We serve patients from across Westchester County — including Scarsdale, New Rochelle, Bronxville, Larchmont, White Plains, Harrison, and Rye — as well as Rockland County communities including New City, Nyack, Suffern, and Spring Valley. We also welcome patients from Bergen County NJ, including Mahwah, Ramsey, Saddle River, Montvale, and Park Ridge.

How to Check Your Insurance and Get Started

Contact Marpa Minds to verify your insurance benefits, confirm your eligibility, and schedule a free clinical consultation. Our team handles the insurance process from start to finish so you can focus on what matters.

Frequently Asked Questions About Ketamine Therapy for Depression

Is ketamine therapy FDA-approved for depression?

 IV ketamine itself is not FDA-approved for depression — it is used off-label. Spravato® (esketamine nasal spray) is FDA-approved specifically for treatment-resistant depression and for major depressive disorder with acute suicidal ideation. It is administered in certified medical clinics under supervision and is covered by most major insurance plans.

How is Spravato® different from IV ketamine infusions? 

Spravato® is FDA-approved and covered by most major insurance plans. IV ketamine is off-label and typically requires full out-of-pocket payment at $400 to $800 per session. Spravato® also follows stricter REMS safety protocols, which means it can only be administered in certified facilities with trained clinical staff — providing a higher level of oversight than many IV ketamine centres.

How many ketamine therapy sessions do I need? 

The standard Spravato® acute treatment course is twice-weekly sessions for four weeks — eight sessions total. After that, most patients transition to once-weekly sessions for four weeks and then a personalised maintenance schedule. The total number of sessions depends on your symptoms, treatment response, and long-term plan, which your clinical team will review with you throughout.

Does ketamine therapy work for anxiety as well as depression? 

In many cases, yes. Patients receiving ketamine therapy for depression frequently report improvements in co-occurring anxiety, PTSD symptoms, and emotional overwhelm. Spravato® is specifically FDA-approved for depression, but the NMDA receptor mechanism appears to have broader effects on mood regulation that often extend to anxiety-related symptoms.

Will I feel high during a ketamine therapy session? 

Most patients experience temporary dissociation, a sense of lightness, or slightly altered perception during the session. This is a known and expected effect of esketamine and is part of how the treatment works neurologically. It typically peaks within the first 40 minutes and resolves before the end of the two-hour monitoring period. Patients do not leave the clinic until they are assessed as stable.

Can I continue my current antidepressants while doing ketamine therapy? 

Many patients continue their existing antidepressants during Spravato® treatment. Spravato® is often used alongside an oral antidepressant as part of a combined approach. All medication decisions should be reviewed with your prescribing clinician before starting treatment.

Is ketamine therapy covered by my insurance? 

IV ketamine infusions are generally not covered by insurance. Spravato® is covered by most major commercial insurance plans — including Blue Cross Blue Shield, Aetna, UnitedHealthcare, Cigna, and Medicare — for patients who meet eligibility criteria. At Marpa Minds, we verify your insurance coverage and handle all prior authorisation paperwork before your first session.