What Is Ketamine Infusion Therapy? A Complete Guide

Short answer: Ketamine infusion therapy is a medical treatment in which a low, carefully calculated dose of ketamine is delivered directly into the bloodstream through an IV over about forty minutes to an hour, in a monitored clinical setting. It is used most often for treatment-resistant depression, as well as anxiety, PTSD, and certain chronic pain conditions. The IV route is considered the gold standard because it is precise, adjustable, and fully absorbed. Here is the complete picture.

The basics

In an infusion session, you relax in a comfortable chair while a small IV delivers a steady, low dose of ketamine, typically around half a milligram per kilogram of body weight, far below anesthetic doses. You remain awake, breathing on your own, while your vital signs are monitored. Most sessions last about an hour from start to finish, with time to rest afterward. Treatment is a series rather than a single visit: most protocols begin with about six infusions over two to three weeks, followed by occasional boosters.

Why IV rather than other forms

Ketamine comes in several forms, including lozenges and the Spravato nasal spray, so why the IV? Precision and reliability. With an infusion, one hundred percent of the dose reaches the bloodstream, the rate can be adjusted in real time, and the experience can be stopped quickly if needed. Absorption from lozenges and nasal sprays is lower and more variable. That control is why IV delivery is widely considered the gold standard for ketamine treatment, and it is the method we use at Ketamine Uplift. Our comparison of ketamine and Spravato goes deeper on the trade-offs.

What it treats

The strongest evidence is in treatment-resistant depression, where studies show a majority of patients respond, often within days. Infusion therapy is also used for anxiety, PTSD, OCD, bipolar depression, and certain chronic pain conditions such as CRPS and neuropathic pain, where ketamine can interrupt pain signaling other medications cannot reach. Our overview of what ketamine therapy is used for covers each condition.

How it works in the brain

Unlike standard antidepressants that act on serotonin, ketamine works on the glutamate system, blocking NMDA receptors and triggering a cascade that promotes new connections between neurons. Researchers believe this rapid rewiring is why relief can arrive in hours to days rather than weeks, and why the period after treatment is such fertile ground for therapy and new habits. The full story is in how ketamine works in the brain.

What a session feels like

Most people describe a dreamlike, floating state, with dissociation, a sense of observing thoughts from a gentle distance, that begins within minutes and fades soon after the infusion ends. Music, an eye mask, and a calm setting shape the experience considerably, which is why environment matters. Expect to feel tired afterward and plan a ride home. We describe the experience fully in what ketamine therapy feels like.

Is it safe, and who is it for

At treatment doses in a screened, monitored setting, ketamine has a strong safety record built on fifty years of medical use, with side effects that are usually mild and brief. It is not appropriate for everyone, which is what medical evaluation is for. See our honest guides to ketamine safety and who makes a good candidate.

This article is for educational purposes only and is not medical advice. Whether infusion therapy is right for you is a decision to make with a qualified provider.

The bottom line

Ketamine infusion therapy is the IV delivery of low-dose ketamine in a monitored medical setting, the most precise and best-studied way to give this treatment. It is used for hard-to-treat depression, anxiety, PTSD, and certain pain conditions, usually as a series of about six infusions followed by boosters. If you want to know whether it fits your situation, call us at (310) 280-4440.

Frequently asked questions

What is ketamine infusion therapy? A medical treatment in which low-dose ketamine is delivered by IV over about forty minutes to an hour in a monitored clinical setting, used for treatment-resistant depression, anxiety, PTSD, and certain chronic pain conditions.

How is infusion therapy different from Spravato or lozenges? IV delivery is fully absorbed and adjustable in real time, making it the most precise option. Nasal spray and lozenge absorption is lower and more variable.

How many infusions do you need? Most protocols start with about six infusions over two to three weeks, followed by occasional booster infusions to maintain the benefit.

Are you asleep during a ketamine infusion? No. The doses are far below anesthesia, so you remain awake and breathing on your own, typically in a relaxed, dreamlike state that fades soon after the session ends.