The 10 minutes before the IV starts

Most of what people imagine about a ketamine infusion happens before the medication ever runs. The buildup is the part patients tend to remember most vividly, and it is also the part we work hardest to make uneventful.

You arrive, check in, and use the restroom because you will not want to get up for the next 90 minutes. A team member walks you to a private room with a recliner, weighted blanket, eye shades, and headphones. You meet our therapy dogs, Walter White and Wilma, if you want to, and they leave when the infusion starts. We confirm your weight, blood pressure, heart rate, and oxygen saturation. Marla Peterson, CRNA, oversees every infusion and will review your medications, any anti-nausea preference, and the music or silence you would like.

The IV placement is the only sharp moment in the entire visit, and it lasts a few seconds. Once the line is in, the medication is loaded into a programmable pump set to your weight-based dose. You are fully clothed, monitors are running, and the door is closed. Nothing about the room looks like a hospital.

Minutes 0 to 10: the onset

The pump starts and you feel nothing for the first two to three minutes. Then the first sign usually arrives in the body, not the mind. People describe a soft warmth in the chest or limbs, a faint tingling at the scalp or fingertips, or a sense that gravity has shifted slightly. Your blood pressure may rise a few points and your heart rate may climb modestly. This is expected and is one of the things the monitors are tracking.

Around minute four to six, the first cognitive change tends to arrive: a slight detachment, as if you are watching your thoughts from a half step behind them. Krystal and colleagues, in their landmark 1994 paper in the Archives of General Psychiatry, mapped these dose-dependent perceptual and dissociative effects in healthy human volunteers and produced the dose-response curve that most modern infusion protocols still reference. What you are feeling at this point is the predicted, well-characterized opening edge of that curve.

Speech becomes effortful. Most patients stop talking around minute seven or eight, not because they cannot, but because words feel heavy and unnecessary. If you have never had an infusion before, this is often the moment you tell yourself, "okay, it is starting." Eye shades go down. Music takes over. The room recedes.

Minutes 10 to 30: the peak

This is the window most people mean when they ask what a ketamine infusion feels like. The pharmacology is centered on NMDA receptor blockade and a downstream surge of glutamate signaling, which we cover in more detail in our explainer on how ketamine works. Subjectively, the experience tends to settle into one of a handful of patterns:

These experiences are formally measured in clinical trials using the Clinician-Administered Dissociative States Scale, a 27-item instrument developed by Bremner and colleagues and published in the Journal of Traumatic Stress in 1998. CADSS is the standard tool for quantifying present-state dissociative symptoms during ketamine research, which is part of why we describe these experiences in plain, specific language rather than mystical terms. They are measurable, reproducible, and dose-related.

You remain conscious. You can hear staff if they enter. You can speak if asked. You can lift the eye shades. The monitors are running continuously and Marla, our CRNA, is available throughout the infusion with anesthesia-level monitoring throughout. If you want the pump slowed, paused, or stopped, that happens immediately.

Minutes 30 to 45: coming back

The pump usually finishes around minute 40. The medication has a short half-life, and within five to ten minutes of the drip stopping, the perceptual peak begins to taper. Time normalizes. The body comes back into the chair. Speech returns first as one-word answers, then full sentences. Patients often describe the taper as gentler than the onset.

Some people feel a little wobbly or queasy in the first ten minutes after the infusion. We have anti-nausea medication on hand and use it preventively for patients who are sensitive. A snack and water help. By minute 60 to 70, most patients are sitting up, talking comfortably, and ready to walk to the car with their driver.

This is also when many patients have their first reflective thought about what just happened. It is normal for it to feel slightly unreal in retrospect, like the memory of a dream you can describe but not fully reinhabit. We do not push interpretation at this stage. There will be time later.

The hour after: recovery and ride home

You will not drive yourself home. A licensed driver is required, and rideshare alone is not enough; we want a person who can walk you in. Most patients feel close to baseline within an hour of the infusion ending, but coordination and judgment can stay slightly off for several hours.

At home, the rest of the day should be quiet. No alcohol, no major decisions, no heavy work, no driving until the following morning. Many patients nap. Some feel a bit tired and emotionally tender, and some feel quietly clearer than they did walking in. None of those reactions is a better predictor of outcome than the others.

If you have been through this before, you may already know which pattern tends to fit you. If this is your first infusion, what we ask is simply that you do not try to evaluate the experience in the first hours. The research on safety is well documented and we go through it in our piece on whether ketamine therapy is safe.

The next 24 to 72 hours: the integration window

The acute drug effects are gone by bedtime. What is not gone is a roughly 24-to-72-hour neuroplastic window during which the brain is more open to forming new connections. This window is one of the reasons ketamine is studied for depression, PTSD, and chronic pain. It is also why we encourage patients to do something gentle and intentional with the day after, rather than diving straight back into the same loops they came in carrying.

Practical things that tend to help in this window:

We cover this in more depth in our guide to the days after a ketamine session. Ketamine is FDA-approved as an anesthetic; its use for depression, anxiety, PTSD, and chronic pain is off-label, and the research base is still developing. Studies indicate the integration window matters, and clinical experience supports treating it as part of the treatment, not an afterthought.

What if I do not feel anything different?

Some patients have a quiet first infusion. Less time distortion, less body distance, less of everything we just described. This is not a failure and it is not a reason to assume the medication is not working. The intensity of the subjective experience is not a reliable predictor of clinical response. People with very mild perceptual experiences sometimes have strong outcomes, and people with more vivid experiences sometimes do not.

Several factors influence the subjective intensity, including dose, body weight, prior exposure to dissociative or sedative medications, current stress level, and how guarded or open you happen to be that day. We adjust dose conservatively across early sessions to find the right level for you. There is no prize for going deeper than necessary.

How MCK structures the room and the day

Our infusion room is built around guidance from the American Society of Ketamine Physicians, Psychotherapists and Practitioners (ASKP) Best Practice Guidelines, which recommend a quiet, low-stimulation environment, eye covers or low light, and trained monitoring throughout subanesthetic ketamine infusions. We follow that standard.

Specifically, that means: a private room with a recliner and a weighted blanket; eye shades and curated music as the default; continuous pulse oximetry, blood pressure, and ECG; CRNA-led care with anesthesia-level monitoring throughout; and an unhurried recovery period before you leave. You will see exactly the same monitoring equipment that an outpatient surgical center uses, in a setting that does not look or feel like one. You can read more about our approach on our how it works page.

Sessions are $475 each. We are transparent about cost up front and you can read the full breakdown in our cost article. Insurance typically does not cover IV ketamine for psychiatric or pain conditions because those uses are off-label.

None of this is a guarantee that ketamine will work for you. Research suggests meaningful response rates for treatment-resistant depression, PTSD, and several chronic pain conditions, but not everyone responds, and the most honest thing we can tell you in advance is what the experience will feel like, what we are watching for, and what we will do if something does not feel right. The rest is a conversation worth having with your prescribing provider and with us.