So what does ketamine feel like? Ketamine is a dissociative anesthetic whose defining subjective effect is detachment—from the body, the surroundings or the passage of time. How that detachment feels depends heavily on dose, route, purpose and setting. A patient receiving ketamine in a monitored clinic and a recreational user may take the same molecule, but dose, route, purity, purpose and setting can produce very different experiences.
What Does Ketamine Feel Like in a Clinic?
Racemic ketamine is used off-label for treatment-resistant depression, while esketamine nasal spray, sold as Spravato, is FDA-approved; our guide to ketamine for depression covers the evidence. The FDA medication guide for Spravato lists common effects that include feeling disconnected, dizziness, nausea, sleepiness, a spinning sensation, numbness, anxiety, low energy, feeling drunk, headache and feeling very happy or excited. They usually start right after a dose and fade the same day. Spravato can temporarily raise blood pressure for about four hours. It must be administered in a certified healthcare setting, where patients are monitored for at least two hours after each dose. Patients should not drive or operate machinery until the following day, after a restful sleep.[1]
Patients describe the experience in mixed terms. In a Dutch interview study of 17 people given oral esketamine for depression, some called their sessions peaceful, relaxing or even spiritual; others found them alienating or frightening. “I had the feeling I was losing myself,” one said. Sessions tended to go better when patients let go rather than fought the effects, and several were surprised by how strong the effects were.[2]
What Do Recreational Users Describe?
Recreational surveys describe a wider range of experiences, often at less controlled and sometimes higher doses. In a UK study of 52 current and former users, most said that at least half the time ketamine made time seem to slow down (85%) and made them feel happy (84%), but many also reported confusion, slurred speech and a loss of the sense of reality. Common after-effects included feeling slowed down, poor attention and low motivation.[3]
At higher doses, users describe the “k-hole”: a state of near-total detachment from the body and the outside world. Among the 52 surveyed users, 71% endorsed floating sensations and 66% mind–body dissociation as k-hole experiences.[3] For some it feels peaceful or profound; for others it is terrifying. In a study of 50 former users who recalled near-death-like experiences on ketamine, nine in ten described altered time and nearly as many a strong sense of leaving their body. Most of those episodes happened during their first few uses. Because researchers specifically recruited people who recalled a ketamine-related near-death experience, the study describes those episodes but cannot estimate how common they are among users generally.[4]
How Do Dose and Route Change It?
Route changes the timing and intensity of the experience. Intravenous ketamine acts fastest because the whole dose enters the bloodstream directly; at anesthetic doses, its US label describes anesthesia within 30 seconds of injection.[5] Nasal dosing reaches peak blood levels quickly with relatively high bioavailability, while oral bioavailability is poor because much of the dose is broken down on its first pass through the liver.[6] At anesthetic doses, the intended result is sedation or unconsciousness rather than the low-dose dissociative experience described here.[5]
Why Do Experiences Differ So Much?
Setting matters too, and so does the person. In a clinic, a measured dose is given with staff watching breathing and blood pressure. Street ketamine has no guaranteed strength or purity and is often taken with alcohol or other drugs. Expectations count too: in the Dutch study, patients who resisted the effects tended to feel more anxious, and some who expected a dramatic “trip” were disappointed when it did not come.[2]
What Are the Risks?
Numbness and confusion make it easy to get hurt without noticing, and a k-hole leaves a person unable to look after themselves. Ketamine can slow breathing, a risk listed for Spravato,[1] and mixing it with alcohol or other drugs adds to the danger. Our article on whether you can overdose on ketamine covers what to watch for. If someone is unresponsive or struggling to breathe, call emergency services.
For a researcher’s view of ketamine as a treatment, read our conversation with Dr. Roger McIntyre.
References
- US Food and Drug Administration. Spravato (esketamine) nasal spray: prescribing information and Medication Guide. Revised September 2026.
- Breeksema JJ, Niemeijer A, Kuin B, Veraart J, Kamphuis J, Schimmel N, van den Brink W, Vermetten E, Schoevers R. Holding on or letting go? Patient experiences of control, context, and care in oral esketamine treatment for treatment-resistant depression: a qualitative study. Frontiers in Psychiatry. 2022;13:948115.
- Stirling J, McCoy L. Quantifying the psychological effects of ketamine: from euphoria to the k-hole. Substance Use & Misuse. 2010;45:2428–2443.
- Corazza O, Schifano F. Near-death states reported in a sample of 50 misusers. Substance Use & Misuse. 2010;45(6):916–924.
- US Food and Drug Administration. Ketalar (ketamine hydrochloride) injection: prescribing information. Revised March 2026.
- Peltoniemi MA, Hagelberg NM, Olkkola KT, Saari TI. Ketamine: a review of clinical pharmacokinetics and pharmacodynamics in anesthesia and pain therapy. Clinical Pharmacokinetics. 2016;55(9):1059–1077.
Editor’s note: This article was originally published on January 17, 2023, by Robert Hammell. In October 2026 the editors rewrote it to separate clinical and recreational experiences and to rest every claim on sources we could verify. This article is for information only and is not medical advice.
Last updated October 2026 · Originally published January 17, 2023.
