What Is a K-Hole? Ketamine Dissociation, Overdose, and What to Do

What is a k-hole?

A k-hole is a state of extreme detachment from the body and from reality that comes with higher doses of ketamine. That is how the National Institute on Drug Abuse’s ketamine page describes it, and it matches what people report. In a 2008 University College London interview study of 90 current and former ketamine users, titled “Journey through the K-hole,” the effects two-thirds of users found most appealing included “melting into the surrounding,” visual hallucinations, and out-of-body experiences. Half named memory loss as an effect they did not want.

There is no hidden k-hole meaning. “K” is ketamine, and the “hole” is the feeling of falling out of ordinary awareness. Ketamine hole, k hole, and k-hole are the same thing.

Ketamine is a dissociative anesthetic, a drug built to separate a patient from pain and surroundings during surgery. The DEA’s ketamine fact sheet says it distorts sight and sound and makes the user “feel disconnected and not in control.” Street names on that sheet include Special K, Super K, Vitamin K, Kit Kat, and Cat Valium.

Clinical ketamine, Spravato, and street ketamine

The rows on dose, monitoring, and setting are the whole difference. The clinical versions are given where someone is watching oxygen levels and can support breathing. A k-hole on the street happens without any of that.

What a k-hole looks like from the outside

The person may be awake but not reachable: eyes open, staring or flicking side to side, unable to answer or answering in fragments, unable to stand or walk. The DEA lists rapid involuntary eye movement, dilated pupils, drooling, and muscle stiffness among ketamine’s effects, and nausea is possible. Someone who responds, even poorly, and is breathing normally is more likely in a k-hole than in an overdose, but that can change, so keep watching. Someone who cannot be roused, or whose breathing is slow, noisy, or irregular, needs 911.

Can you overdose on ketamine?

Yes. The DEA fact sheet puts it in one line: “An overdose can cause unconsciousness and dangerously slowed breathing.” The FDA label for Ketalar, the anesthetic form, says overdose can bring changes in heart rate and blood pressure, respiratory depression, and apnea, and that assisted ventilation, including a mechanical ventilator, may be needed. The same label warns that vomiting and aspiration can occur even though some throat reflexes stay partly active. A person in a k-hole who vomits while lying on their back can inhale it.

Can ketamine kill you?

It can, and when it does it is usually not alone. A CDC report in MMWR (November 2024) found ketamine in 912 overdose deaths across 45 jurisdictions from July 2019 to June 2023, about 0.4 percent of all overdose deaths in that data. Ketamine was the only drug involved in 24 of them. About 82 percent involved illegally made fentanyl, methamphetamine, or cocaine, and fentanyl alone was involved in about 59 percent. The number is small and rising: in the 28 jurisdictions tracked for trends, ketamine was found in 47 deaths in the second half of 2019 and 107 in the first half of 2023.

A k-hole can also be dangerous in ways that never show up as an overdose. A person who cannot move or judge danger is at risk around water, heights, cold, and traffic. And ketamine has been used to facilitate sexual assault, which the DEA notes on the same fact sheet. If that may have happened, call 911 if anyone is hurt or in danger. New Jersey’s 24-hour sexual violence hotline, 1-800-601-7200, and the national RAINN hotline, 1-800-656-4673, connect survivors with a confidential advocate and the forensic exam. Both are independent of this site and its publisher, and neither is a treatment line. Our guide to being drugged explains the exam and what to do next.

Is there a ketamine reversal agent?

No. There is no antidote for ketamine the way naloxone is an antidote for opioids; the Ketalar label’s overdose section lists only supportive care. Emergency care means keeping the airway open, supporting breathing, managing blood pressure and agitation, and waiting for the drug to wear off. That is why the response to a person who cannot be woken is 911 and not a wait-and-see.

Ketamine with alcohol, benzodiazepines, or opioids

This is where most of the danger is. The Ketalar label warns that combining ketamine with opioids, benzodiazepines, or other central nervous system depressants, “including alcohol,” may result in “profound sedation, respiratory depression, coma, and death.” NIDA reports that ketamine taken with opioids or GHB was linked to the most health problems, some of them life-threatening.

• Ketamine and alcohol. Both blunt awareness; alcohol adds vomiting and further slows breathing. A person drunk and in a k-hole has two reasons not to protect their airway.
• Ketamine and benzodiazepines. Xanax, Klonopin, and pressed “bars” stack sedation on top of dissociation. Pressed bars may also contain fentanyl or designer benzodiazepines; our guide to pressed Xanax bars covers what is in them.
• Ketamine and opioids. Illegally made fentanyl was involved in about 59 percent of the overdose deaths in which the CDC found ketamine, more than any other drug. Fentanyl stops breathing; ketamine removes the awareness that might have made someone notice.

Powder sold as ketamine is not always ketamine, and powder sold as something else sometimes is. Anyone who uses should not use alone, should not mix it with alcohol, benzos, or opioids, should keep naloxone nearby, and should know that fentanyl test strips have been legal to carry in New Jersey since January 2024, per the state Department of Health.

Ketamine bladder: ulcerative cystitis and kidney damage

Regular ketamine use can damage the lining of the bladder. A 2020 systematic review in Neurourology and Urodynamics of 75 papers found that regular users report severe urgency, frequency, and pelvic pain, that cystoscopy shows ulcerative cystitis, and that long-term use can scar the bladder until it shrinks, narrow the ureters, and back urine up into the kidneys (hydronephrosis). Stopping ketamine is the first treatment. Early cases can improve with medication and bladder procedures; in end-stage disease, surgeons may enlarge the bladder with a section of bowel.

The Ketalar label now lists the same urinary complications, and adds liver and bile duct injury, including sclerosing cholangitis, with recurrent use. Users also describe “K-cramps,” severe abdominal pain; frequent users in the UCL study ranked these and cystitis among their main worries. Blood in the urine, pain on urinating, or needing to go every few minutes in someone who uses ketamine is a reason to see a doctor and to say the word ketamine out loud in the appointment.

Spravato and ketamine clinics are not the same thing as street use

Esketamine, sold as Spravato, is FDA-approved for treatment-resistant depression and for depressive symptoms in adults with acute suicidal thinking. Its prescribing information carries a boxed warning for sedation, dissociation, respiratory depression, abuse and misuse, and suicidal thoughts. It is available only through a restricted program, the SPRAVATO REMS; patients take it in a certified office and are monitored for at least 2 hours after each dose, and they may not drive until the next day after a restful sleep. In the clinical trials, 61 to 84 percent of patients had dissociative or perceptual changes.

Ketamine itself is FDA-approved only as an anesthetic. Ketamine infusion clinics treating depression are using it off-label, and compounded ketamine sold by telehealth for home use is not FDA-approved. None of this is a reason to start ketamine on your own, and none of it is a reason to stop a treatment a clinician is running. If you are in treatment and worried about how you are using it, tell the prescriber.

Is ketamine addictive?

It can be. The Ketalar label reports tolerance with prolonged use and withdrawal symptoms, including craving, fatigue, poor appetite, and anxiety, after frequent, large doses over long periods. In the UCL study, most frequent users said they kept using until their supply ran out, and their dose had risen about six-fold on average since they started. NIDA adds that frequent use can cause delusions lasting up to a month after stopping.

What detox looks like for ketamine

The withdrawal symptoms the Ketalar label reports after heavy, long-term use are craving, fatigue, poor appetite, and anxiety. No medication is FDA-approved specifically for ketamine use disorder, and treatment centers on counseling, managing depression and anxiety, and, when the bladder is involved, urology. Medical detox matters most when ketamine is one of several substances. Daily alcohol or benzodiazepine use alongside it carries its own withdrawal risks, including seizures, and opioid dependence needs its own plan. Our polysubstance detox guide covers how programs handle more than one drug at once. If someone is having thoughts of suicide, call or text 988.

In New Jersey

Under New Jersey law P.L.2017, c.28, fully insured New Jersey plans and the State Health Benefits and School Employees’ plans cannot require prior authorization for the first 180 days per plan year of in-network treatment your own physician, psychologist or psychiatrist finds medically necessary, and cannot run concurrent or retrospective medical-necessity review for the first 28 days of an in-network inpatient stay. Self-funded employer plans, Medicare and Medicaid are not covered by that rule, so verify with the plan. NJ FamilyCare covers the substance use continuum, from withdrawal management through outpatient care, with the level of care set by ASAM criteria and, for some levels, prior authorization. Our insurance guides go plan by plan.

ReachNJ, the state’s treatment referral line, answers at 1-844-732-2465, and the IME Addictions Access Center at 1-844-276-2777 screens NJ FamilyCare and uninsured residents and refers them to treatment. Both are independent of us. Periscope Behavioral Health, which publishes this site, is opening a medical detox in Hammonton, Atlantic County, expected Summer 2027. Until then, Periscope Behavioral Health, our publisher’s admissions line, at (888) 313-3583 can talk through options in New Jersey and Florida, including facilities Periscope operates. What a plan covers depends on the plan and the facility’s network status.