What Is Ketamine Therapy? Understanding Ketamine-Assisted Therapy

If you have been asking, “What is ketamine therapy?” you may be picturing a medication infusion and wondering how that becomes mental health treatment. In ketamine-assisted therapy, the medicine is only one part of the process. Ketamine is paired with psychotherapy, preparation, and integration so that symptom relief and the experience itself can be explored in a thoughtful clinical setting.

Ketamine is a dissociative anesthetic, not a classic psychedelic. Although ketamine is FDA-approved as an anesthetic, ketamine used for depression and other psychiatric conditions is prescribed off-label. The related medication esketamine, sold as Spravato, has separate FDA-approved indications for treatment-resistant depression.[1][2]

Table of Contents

• What makes ketamine-assisted therapy different?
• How does ketamine-assisted therapy work?
• Why is ketamine used for treatment-resistant depression?
• What does ketamine therapy feel like?
• Is ketamine-assisted therapy safe?
• How quickly can ketamine provide relief?

What Makes Ketamine-Assisted Therapy Different From a Ketamine Infusion?

A ketamine infusion is the medical administration of ketamine. Ketamine-assisted psychotherapy (KAP) adds a therapeutic process around the medicine.

That may include preparation sessions before treatment, professional support around the medicine session, and integration therapy afterward. At Las Vegas Center for Psychedelic Therapy, the current model pairs therapeutic preparation and integration with IV ketamine administered by a board-certified anesthesiologist at a medical clinic.

This is an important difference if your goal is not only to feel better temporarily, but also to understand patterns, emotions, memories, or insights that may come forward during treatment.

Research on KAP is promising, but it is also still developing. A 2026 systematic review focused on treatment-resistant depression found improvements across KAP studies, while also noting that the limited controlled research has not yet established that adding psychotherapy creates a unique antidepressant effect beyond ketamine itself.[3] Therapy may still offer a valuable structure for preparation, meaning-making, and turning insight into day-to-day change.

For a deeper look at the medication itself, read How Does Ketamine Therapy Work? A Gentle, Science-Based Guide.

How Does Ketamine-Assisted Therapy Work?

Ketamine acts primarily on the brain’s glutamate system, including NMDA receptors. Researchers believe its antidepressant effects involve changes in glutamate signaling and synaptic plasticity, or the brain’s ability to strengthen and reorganize connections.[4]

In ketamine-assisted therapy, treatment generally has three parts:

1. Preparation: You talk with a therapist about your history, goals, expectations, concerns, and how you want to approach the experience.
2. Medicine session: Ketamine is administered and medically monitored. Depending on the clinical model, therapeutic support may also be available during the experience.
3. Integration: Afterward, therapy helps you process what came up and decide what, if anything, you want to carry into your relationships, habits, coping, or ongoing treatment.

This is one reason KAP is often discussed alongside psychedelic-assisted therapy. The altered state is not treated as the entire intervention. The therapeutic context around it matters too.

Why Is Ketamine Used for Treatment-Resistant Depression?

Treatment-resistant depression generally describes depression that has not improved enough after appropriate standard treatments. For someone who has spent months or years trying medications or therapy without enough relief, the possibility of a faster-acting option can feel significant.

Ketamine has been studied extensively for its rapid antidepressant effects. In clinical trials involving people with treatment-resistant depression, symptom improvement has sometimes been measurable within hours rather than weeks.[5]

That does not mean everyone feels dramatically better after one session. Some people respond quickly, some need repeated treatment, and some do not respond. Benefits may also fade, which is why treatment planning, follow-up, and ongoing mental health care matter.

If you are wondering what a typical treatment series can look like, read How Many Ketamine Sessions Do I Need? What to Expect With Ketamine Assisted Therapy.

What Does Ketamine Therapy Feel Like?

Ketamine experiences vary, but many people notice temporary changes in perception, body awareness, time, or their usual sense of self. Research on subanesthetic ketamine has documented dissociative experiences such as feeling detached from the body or experiencing an altered sense of reality.[6]

You may feel:

• Floaty, dreamlike, or deeply relaxed
• Less connected to your usual sense of time or space
• Emotionally distant from thoughts that normally feel overwhelming
• More aware of imagery, memories, sensations, or internal experiences

Not everyone has a profound or emotional experience, and a dramatic “journey” is not required for ketamine to have an antidepressant effect.

Is Ketamine-Assisted Therapy Safe?

Ketamine can be used safely in appropriately screened and medically monitored patients, but it is not risk-free or appropriate for everyone.

Common short-term effects can include dissociation, dizziness, nausea, headache, anxiety, sleepiness, and temporary increases in blood pressure.[7] Because ketamine can affect consciousness and vital signs, medical screening and monitoring are an important part of treatment.

It also has misuse and dependence potential, which is another reason ketamine should be used under qualified clinical supervision rather than as a self-directed mental health treatment.

For a fuller breakdown, read Ketamine Therapy Side Effects: What to Expect During Ketamine-Assisted Therapy.

If you are curious about ketamine but unsure whether your medical or mental health history makes you a good candidate, you do not have to figure that out alone. You can get started with Las Vegas Center for Psychedelic Therapy and talk through your questions with the team.

How Quickly Can Ketamine Provide Relief?

For some people with treatment-resistant depression, improvement may begin within hours or by the following day. A randomized trial published in 2024 found reduced depression and anxiety ratings within one hour after ketamine administration, with effects lasting up to seven days in that study.[5]

But speed is not the same thing as permanence. Ketamine can create a rapid shift for some people, while the larger therapeutic goal is to determine whether that shift can be supported and translated into meaningful, sustainable change.

This is where ketamine-assisted therapy takes a broader view. Rather than asking only, “Did the medicine reduce my symptoms?” therapy also creates space to ask, “What do I want to do with this opening?”

What Is Ketamine Therapy? The Bottom Line

Ketamine therapy can mean several things, but ketamine-assisted therapy is more than simply receiving ketamine. It combines medically supervised ketamine with a therapeutic framework that may include preparation, support, and integration.

For people dealing with treatment-resistant depression or other persistent mental health symptoms, ketamine offers a fast-acting option with meaningful research behind it. The evidence for ketamine itself is stronger than the evidence for exactly how much psychotherapy adds to its antidepressant effect, but KAP gives the experience a structured therapeutic context rather than treating the medicine as the whole answer.

If you are ready to explore whether ketamine-assisted therapy may fit your needs, get started with our Las Vegas team today.

Footnotes & Sources

1. U.S. Food and Drug Administration. FDA warning regarding compounded ketamine products for psychiatric disorders. Read the FDA source

2. U.S. Food and Drug Administration. Spravato (esketamine) Prescribing Information, revised 2025. Read the prescribing information

3. Effectiveness of ketamine-assisted psychotherapy as a treatment for treatment-resistant depression: a systematic review. PubMed, 2026. Read the systematic review

4. The N-methyl-D-aspartate receptor hypothesis of ketamine’s antidepressant action: evidence and controversies. PubMed, 2024. Read the review

5. Ketamine for treatment-resistant major depressive disorder: Double-blind active-controlled crossover study. PubMed, 2024. Read the study

6. Subanaesthetic ketamine and altered states of consciousness in humans. PubMed. Read the study

7. Ceban F, et al. Prevention and Management of Common Adverse Effects of Ketamine and Esketamine in Patients with Mood Disorders. CNS Drugs, 2021. Read the review