When traditional antidepressants have not brought relief, it can feel like you have run out of options. You have not. Manhattan has many ketamine providers, and quality varies widely between them. If you are searching for the best ketamine infusion clinic in Manhattan for treatment-resistant depression, the most useful thing we can offer is not a sales pitch—it is a clear framework for comparing any provider, and an honest description of how we deliver care.
Nushama is the largest ketamine center in New York City. We mention our size not as a boast, but because scale lets us do things smaller programs often cannot: maintain board-certified physicians and registered nurses on site for every session, offer both IV ketamine and Spravato (esketamine) under one roof, and build dedicated preparation and integration into every member’s care. This guide explains what treatment-resistant depression is, why IV ketamine has the strongest evidence behind it, and how to evaluate any Manhattan provider—including us.
What “treatment-resistant depression” really means
Treatment-resistant depression (TRD) happens when at least two different antidepressants, taken at an adequate dose for an adequate length of time, do not improve your symptoms (Cleveland Clinic). It is more common than most people realize. By some estimates, around 30% of people living with depression meet this definition.
A few things are worth saying plainly:
- TRD is not a personal failing. It reflects how complex depression is, not a lack of effort on your part.
- “Resistant” does not mean “untreatable.” It means the first approaches have not worked yet, and it is reasonable to consider other evidence-based paths.
- You are not alone in this. Treatment-resistant depression affects nearly 3 million people in the United States (National Institute of Mental Health).
If you have tried multiple medications without meaningful improvement, that history is exactly what makes ketamine therapy worth a careful conversation.
Why IV ketamine has the strongest evidence
Ketamine works differently from traditional antidepressants. Rather than slowly adjusting brain chemistry over weeks, it appears to support neuroplasticity—the brain’s ability to form new connections—often within hours or days. Researchers began studying it as a rapid-acting option for depression in the early 2000s, and that interest eventually led the U.S. Food and Drug Administration to approve esketamine, a nasal spray derived from ketamine, for treatment-resistant depression in 2019 (Yale Medicine).
There are several ways to receive ketamine. At Nushama, IV (intravenous) infusion is our default for treatment-resistant depression, and the reason is precision.
- Real-time dose control. With an IV, our physicians can titrate—adjust the dose moment to moment—based on how you respond. Lozenges and at-home sprays cannot offer that.
- The strongest published evidence base. IV ketamine remains the most studied form for TRD, allowing rapid symptom relief that can begin within hours.
- Medical oversight throughout. Because the medicine is delivered in a monitored setting, our team can respond immediately if your vitals shift or you feel uncomfortable.
We are not dismissive of other options. Spravato has real advantages for some members, and at-home formulations may eventually expand access. But for people whose depression has resisted treatment, the control and evidence behind IV ketamine make it the option we reach for first. You can read more in our comparison of Spravato versus IV ketamine.
Why preparation and integration matter as much as the medicine
This is the part many clinics skip, and it is the part we consider essential. Ketamine can open a window of insight and emotional flexibility. What you do with that window shapes whether early relief becomes lasting change.
That is why we build two bookends around every journey:
- Preparation. Before your first session, we help you set intentions and understand what to expect, so you can approach the experience with clarity rather than anxiety.
- Integration. Afterward, licensed therapists or trained integration coaches help you translate what surfaced during a session into changes you can carry into daily life. Integration is simply the work of making meaning stick.
Medicine is a catalyst, not a cure-all. We say this often because it is true, and because it protects you from the disappointment that follows treatment delivered without support.
What a single infusion and a full series look like
At our Manhattan center, a typical course involves about six IV ketamine infusions over a three-to-six-week period, often up to twice weekly. Each session takes place in a private, calm room with eye shades and gentle music, and a member of our care team is present throughout.
Relief can begin quickly for some people—sometimes within hours of a first infusion—though the more durable benefit tends to build across the full series rather than from any single session. Individual results vary, and your physician will tailor dosing to your weight, history, and comfort. The goal is not a dramatic single experience; it is steady, supported progress.
Five criteria for choosing a ketamine clinic in Manhattan
The number of ketamine providers in New York City has grown quickly, and quality varies. Whether or not you choose us, these are the questions worth asking any provider before you commit.
1. Medical expertise and in-session monitoring
Look for board-certified physicians or psychiatric specialists who complete a thorough medical assessment before treatment, and who monitor your vitals during each infusion. Same-day treatment without screening, or being left unmonitored, are red flags.
2. Preparation and integration support
Ask whether the program includes dedicated preparation and integration sessions, or whether it only delivers the dose. Infusion-only models often let the neuroplastic window close without guidance.
3. A real screening process
Every member should receive a comprehensive medical and psychiatric evaluation that reviews medications, checks for contraindications, and confirms ketamine is appropriate. Pre-treatment testing may include blood pressure and an EKG.
4. Set and setting
The environment matters. A serene, private space supports introspection in a way that a busy, clinical room cannot.
5. Transparency about cost and access
IV ketamine is generally not covered by insurance, so ask about superbills, payment plans, and any scholarship programs. At Nushama, our Hero’s Journey scholarship supports veterans and first responders who might otherwise face financial barriers.
For a deeper walk-through, our team wrote a companion guide on the best ketamine clinics in Manhattan for people who haven’t responded to antidepressants.
How Nushama approaches treatment-resistant depression
Here is what the process looks like with us:
- Consultation and medical assessment. We review your full treatment history and current medications to confirm ketamine therapy is appropriate and safe for you.
- Preparation. We help you set intentions and prepare your mindset for the work ahead.
- IV ketamine sessions. Our physicians administer your infusions in a serene setting, with vitals monitored throughout.
- Integration. Our team helps you carry insights into lasting, everyday change.
Because we offer both IV ketamine and Spravato, we have no incentive to push one path over another. Many members begin with IV ketamine for rapid relief and later transition to Spravato for maintenance once insurance authorization is in place. Your plan is built around your needs, not ours.
A note on care, not advice: nothing here is a diagnosis or medical recommendation. The right next step is a conversation with a qualified clinician who can review your specific history.
Frequently asked questions
Is IV ketamine still the most supported option for treatment-resistant depression?
For TRD, yes. IV ketamine is the most well-studied form, allows real-time dose adjustments, and can deliver rapid relief. Newer long-acting formulations are still early in development.
How quickly might ketamine help?
Some people notice changes within hours of a first infusion, though the strongest, most durable benefit usually builds across a full series of about six sessions. Results vary from person to person.
Is ketamine therapy safe?
When delivered with proper screening, dose control, and monitoring, ketamine has a well-documented safety profile. At Nushama, board-certified physicians and registered nurses are present throughout every session, and every member is screened beforehand for contraindications.
What is the difference between IV ketamine and Spravato?
Spravato (esketamine) is an FDA-approved nasal spray for treatment-resistant depression, often covered by insurance, and requires on-site observation after each dose. IV ketamine offers broader clinical use and faster onset for many people. We help you choose based on your clinical needs and goals.
Do I need to stop my current antidepressants?
Not necessarily. Many members continue their existing medications, but your physician will review everything during your assessment and advise you directly.
A calm next step
If antidepressants have not worked for you, that history does not define your future. IV ketamine, delivered with careful screening, real-time dosing, and genuine integration support, may help when other approaches have not.
Speak with our care team to talk through your history and find out whether ketamine therapy is a fit for you.
