Most people arrive here wanting a timeline. There is not one to give, and a page that invents it would be doing you harm.
What the National Institute on Drug Abuse says is narrower and worth reading closely. Laboratory research and a few human studies suggest that using the dissociative drug ketamine outside of a clinical setting can lead to cravings as well as symptoms of withdrawal [1]. NIDA does not list those symptoms, does not give a duration and does not name a worst day. It says instead that it conducts and supports research to better understand how often and to what extent people experience tolerance and withdrawal from this class of drug [1].
That is the gap. The rest of this page is what fills it, and there is more of it than the gap suggests: the signs of dependence NIDA does describe, delusions that can outlast the drug by weeks, bladder and abdominal harms that need a clinician, and why stopping without one is the wrong plan. Our page on ketamine and its effects covers the drug itself, and our drug addiction hub covers the rest.
Does Ketamine Cause Withdrawal?
The answer is a qualified yes, and the qualifiers are NIDA’s own.
NIDA’s wording is that laboratory research and a few human studies suggest that non-clinical ketamine use can lead to cravings as well as symptoms of withdrawal [1]. A few human studies is a small evidence base, and this page is not going to dress it up as a settled clinical picture.
What follows from that is a rule rather than a preference. No timeline from another drug gets borrowed here. Opioid withdrawal has published onset figures, written per drug; stimulant withdrawal has a pinned peak. Ketamine is neither, and stretching either set across it would produce numbers that look authoritative and mean nothing.
Ketamine is a dissociative. NIDA explains that dissociative drugs, including ketamine and PCP, block the action of N-methyl-D-aspartate receptors, part of the brain’s system for transporting the neurotransmitter glutamate [1]. That is a different mechanism from the drugs whose withdrawal courses are well mapped, which is part of why the research has not caught up. Our general explainer on withdrawal symptoms covers the substances where the picture is clearer.
What Ketamine Is, and Why the Legal Version Confuses the Question
Two ketamines are in circulation and the difference changes the conversation.
NIDA describes ketamine as a chemical compound used as an anesthetic in humans and animals [2]. A derivative, esketamine, sold under the brand name Spravato, is approved by the Food and Drug Administration for treatment-resistant depression in adults [2]. Ketamine itself is not FDA-approved for any mental health disorder, though clinics across the United States offer it off-label for depression, anxiety and other conditions [2].
Then there is the other supply. NIDA states there is illicitly manufactured ketamine, sold as a liquid or off-white powder [2].
Why this matters when you are trying to stop: someone who started in a clinic and someone who buys it are asking the same question with different answers, and both need a prescriber rather than a web page. Our section on prescription drug addiction covers that overlap. This page publishes no amounts and no route-by-route detail, because a figure of that kind on a consumer page is an instruction however it is framed.
The Signs of Dependence NIDA Does Describe
This is the checklist that replaces the timeline, and it is more useful than one.
NIDA reports that studies in humans show regular ketamine use is associated with symptoms of addiction [2]. It names them: continued use despite knowing that it is causing problems, physically hazardous use, using more than intended, spending too much time obtaining or using ketamine, and tolerance, which is when more of a drug is needed for it to have the same effects [2].
Laboratory studies show that ketamine use can cause brain changes typical of a drug with addictive potential [2]. And NIDA closes the section with its own limit: more research is needed to determine how addictive ketamine might be [2].
Read that list against your own week rather than against a symptom chart. Three or four of those in a row is a better reason to call somebody than any number of difficult days would be.
Delusions That Can Outlast the Drug
This is the finding people are least prepared for, and it is the reason stopping can feel like it is going wrong when it is not.
NIDA states that frequent recreational ketamine use can lead to delusions that can last up to one month after a person stops using it [2]. Its page on dissociative drugs puts it the same way from another angle: people who engage in regular recreational use of ketamine are more likely to experience delusions, even after weeks of abstinence [1].
The surrounding hedges stay attached. At high doses, ketamine may cause psychosis, a mental illness that causes a person to lose touch with reality [2]. Research suggests ketamine can make symptoms worse in people who have schizophrenia and can cause short-term episodes of psychosis [1]. And it is not clear whether ketamine raises the risk of long-term psychosis [1].
If someone is having a seizure, is unresponsive or has trouble breathing, call 911. For a mental-health crisis call or text 988.
The practical reading is straightforward. Symptoms that persist after the drug is gone are not evidence that stopping was a mistake. They are a reason to be assessed by somebody who can tell delusions from a rough week, and dual diagnosis treatment is the name for care that handles both at once.
Bladder, Gut and Memory: Harms That Do Not Stop When Use Does
Some of what brings people to this page has nothing to do with cravings.
NIDA reports that ketamine use can cause ketamine-induced uropathy, which it describes as a treatable but potentially serious condition that causes symptoms like those of a urinary tract infection [2]. Both halves of that phrase matter. It is treatable. It is also potentially serious, and it does not resolve because someone stopped last week.
Long-term use may also cause gastrointestinal problems, including abdominal pain sometimes called k-cramps [2]. And long-term, heavy ketamine use is associated with memory problems, depression, and anxiety [2].
These are the findings that turn “I should probably cut down” into a medical appointment. A urinary symptom or persistent abdominal pain in someone using ketamine is a reason to be seen, whatever is happening with the use itself.
Getting assessed rather than guessing
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Why Stopping Alone Is the Wrong Plan
The danger with ketamine is less about the days after the last use and more about what happens while use continues.
NIDA states that studies show unsupervised ketamine use may have serious health risks, and names respiratory depression among them, which it defines as dangerously slow and shallow breathing [2].
If someone is having a seizure, is unresponsive or has trouble breathing, call 911. For a mental-health crisis call or text 988.
The trend behind that warning is measurable. A NIDA-funded study found that problems related to ketamine use reported to poison control centers increased 81% from 2019 to 2021 [2]. The use of other drugs alongside ketamine, especially opioids or GHB, led to the most health problems, some of them life-threatening [2].
There is a supply question too, and NIDA keeps it open rather than overstating it. More research is needed to understand to what extent psychedelic and dissociative drugs may be mixed with contaminants, such as fentanyl, that may cause an overdose [1]. That is an unresolved risk rather than a documented one, and it is written here the way NIDA writes it.
What an Assessment Looks At
The first questions are medical, and that surprises people who expected a conversation about willpower.
Expect the bladder and abdominal symptoms first, because they are treatable and because they date the problem. Expect a mental health history covering depression, anxiety, memory and whether delusions have been present, since NIDA associates all four with long-term heavy use [2].
Expect questions about everything else being used, because that is where the harm has concentrated. NIDA names opioids and GHB specifically as the combinations that produced the most health problems [2].
The output is a recommended level of care and a first plan. Our pages on the levels of care and on how long rehab takes explain what that means in practice.
Treatment After Ketamine, and What Does Not Exist Yet
Start with the honest absence. No medication is approved for ketamine use disorder. NIDA also notes that ketamine itself is not currently approved by the FDA for the treatment of any substance use disorder, although it is being investigated for some [2].
What exists is the rest of care, and it is not a consolation prize. An assessment, treatment of the co-occurring mental health condition, behavioral work, and a level of care matched to the picture. Our page on therapy approaches used in treatment sets out what those sessions involve.
Getting through the acute phase is the start of that, not the end of it. SAMHSA’s detoxification protocol states directly that detoxification is not substance abuse treatment and rehabilitation [3], and its chapter on settings and levels of care describes the range of places that work can happen, from an outpatient setting to acute care inpatient [4]. MedlinePlus makes the same point in a sentence a reader can hold onto: most people need long-term treatment after detox [5].
Medical detox is one level of care among several. Some people step into residential rehab, others into an outpatient program. Our guide to getting into rehab covers the order the calls happen in, our treatment centers lists our campuses by state, and if cost is the obstacle, see what rehab costs and whether insurance covers it.
Frequently Asked Questions
Does ketamine cause withdrawal? Cravings and withdrawal symptoms are reported, and the evidence is thin. NIDA’s wording is that laboratory research and a few human studies suggest that using ketamine outside of a clinical setting can lead to cravings as well as symptoms of withdrawal. NIDA does not list the symptoms or give a duration, and says it supports research to understand how often and to what extent people experience tolerance and withdrawal.
How long does ketamine withdrawal last? No federal source publishes a ketamine withdrawal timeline, so this page gives none rather than borrowing one from another drug. NIDA does publish one durational fact worth knowing: frequent recreational ketamine use can lead to delusions that can last up to one month after a person stops using it. That is a reason to be assessed rather than to wait it out alone.
Can someone stop ketamine without medical help? It is the wrong plan, for reasons that are about the drug rather than the days after it. NIDA reports that unsupervised ketamine use may have serious health risks, including respiratory depression, which is dangerously slow and shallow breathing. If someone is unresponsive or has trouble breathing, call 911. For a mental-health crisis, call or text 988. An assessment also catches the bladder and memory problems.
Can ketamine damage the bladder? NIDA states that ketamine use can cause ketamine-induced uropathy, which it describes as a treatable but potentially serious condition causing symptoms like those of a urinary tract infection. Long-term use may also cause gastrointestinal problems, including abdominal pain sometimes called k-cramps. Urinary symptoms or ongoing abdominal pain in someone using ketamine are reasons to see a clinician, whatever is happening with the use.
What does treatment for ketamine use involve? An assessment first, then a level of care. No medication is approved for ketamine use disorder, and NIDA notes ketamine itself is not currently approved by the FDA for treating any substance use disorder. What exists is behavioral treatment, care for the co-occurring mental health condition, and the levels of care. SAMHSA states that detoxification is not substance abuse treatment and rehabilitation.
Sources
- National Institute on Drug Abuse. Psychedelic and Dissociative Drugs. National Institutes of Health. https://nida.nih.gov/research-topics/psychedelic-dissociative-drugs
- National Institute on Drug Abuse. Ketamine. National Institutes of Health. https://nida.nih.gov/research-topics/ketamine
- Center for Substance Abuse Treatment. (2006). Detoxification and Substance Abuse Treatment, Chapter 1: Overview, Essential Concepts, and Definitions in Detoxification. Treatment Improvement Protocol (TIP) Series No. 45. Substance Abuse and Mental Health Services Administration, via NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK64119/
- Center for Substance Abuse Treatment. (2006). Detoxification and Substance Abuse Treatment, Chapter 2: Settings, Levels of Care, and Patient Placement. Treatment Improvement Protocol (TIP) Series No. 45. Substance Abuse and Mental Health Services Administration, via NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK64109/
- MedlinePlus Medical Encyclopedia. Opiate and Opioid Withdrawal. National Library of Medicine. https://medlineplus.gov/ency/article/000949.htm
This page is for general information and is not medical advice. Only a licensed clinician who knows your history can tell you what is right for you. If you or someone you know is in immediate danger, call 911. For free, confidential support 24/7, call or text 988.
Author
Chief Medical Officer,
The Recovery Village
