What Is Ketamine?

Ketamine is a dissociative anesthetic first developed in the 1960s and still used medically for anesthesia, pain management, and — more recently — as a rapid-acting treatment for treatment-resistant depression (under clinical supervision). It is a Schedule III controlled substance in the United States, meaning it has accepted medical uses but also potential for abuse.

Recreationally, ketamine is known by street names including Special K, K, Vitamin K, and — reflecting its veterinary anesthesia use — horse tranquilizer. It produces dissociation (a profound disconnection from one’s sense of self and surroundings), hallucinogenic experiences, and altered perception of time and space. At very high doses, users describe a complete dissolution of normal reality called a “K-hole” — a state of profound dissociation in which movement and communication may be impossible.

How Ketamine Works in the Brain

Ketamine’s primary mechanism is as an NMDA receptor antagonist. NMDA receptors play a central role in memory, learning, and pain signaling. By blocking these receptors, ketamine disrupts normal communication between neurons, producing the dissociative and anesthetic effects.

Unlike most anesthetics that depress overall brain activity, ketamine paradoxically increases electrical activity in some brain regions while blocking NMDA transmission — which is part of why it produces unusual perceptual effects rather than simply sedation.

At recreational doses, ketamine produces:

  • Dissociation — a sense of being outside one’s body or disconnected from reality
  • Hallucinations and distorted perception of space and time
  • Analgesia (reduced pain sensation)
  • Sedation and disorientation
  • At high doses, the K-hole: profound dissociation with inability to respond to surroundings

Is Ketamine Addictive?

Ketamine does not produce the severe physical dependence associated with opioids or alcohol — stopping suddenly does not typically produce dangerous withdrawal symptoms. However, psychological dependence is common with regular use, and tolerance develops rapidly: users need increasing amounts to achieve the same dissociative effects.

Heavy, regular ketamine use is associated with a pattern of compulsive use that meets clinical criteria for stimulant or other substance use disorder. According to the Drug Enforcement Administration (DEA) and NIDA, people who use ketamine frequently report difficulty controlling use, craving between doses, and continued use despite significant negative consequences.

Physical consequences of chronic heavy recreational ketamine use are serious and distinct from most other substances. The risks described below are documented in the context of repeated non-medical use at recreational doses. The risk profile differs substantially from ketamine administered under medical supervision — where doses are carefully controlled, frequency is limited, and use is clinically monitored — though supervised medical use carries its own clinical considerations managed by prescribers.

  • Ketamine cystitis (also called ketamine-induced uropathy) — perhaps the most clinically distinctive consequence of heavy recreational use. Frequent high-dose ketamine use causes severe, progressive bladder damage characterized by inflammation, scarring, reduced bladder capacity, and constant pain. In severe cases, the bladder shrinks dramatically and may require surgical removal. This condition is essentially unique to heavy recreational ketamine use and is irreversible at advanced stages.
  • Kidney damage — related to the bladder inflammation; ketamine metabolites are toxic to the upper urinary tract with heavy use
  • Cognitive impairment — chronic ketamine use is associated with memory problems, attention deficits, and difficulty with executive function. These effects may persist for weeks or months after stopping use.
  • Mood disruption — depression and anxiety are common during and after periods of heavy use
  • Nasal damage — from insufflation (snorting); can include perforation of the nasal septum and structural damage

Ketamine and LGBTQ+ Communities

Ketamine has had a longstanding presence in LGBTQ+ nightlife and party drug culture, particularly in gay male communities. Its dissociative effects are used recreationally at dance events, in social settings, and in chemsex contexts. The K-hole experience — for some users, an intentional goal — involves a depth of dissociation that makes it particularly compelling for people seeking escape from emotional pain or social anxiety.

For LGBTQ+ people who have used ketamine partly as a way of managing minority stress, social anxiety, trauma, or the cumulative weight of discrimination, the psychological pull of dissociation can be particularly strong. Treatment that understands these specific dynamics — without pathologizing the person’s identity or community — is meaningfully different from generic care.

For more on substance use in LGBTQ+ social and sexual contexts, see our articles on chemsex and party and play (PnP).

What Treatment Provides

Treatment for ketamine use disorder focuses on psychological support, skill-building, and addressing the emotional and social contexts that sustain use. There is no medication specifically approved for ketamine use disorder, so behavioral treatment is the primary intervention.

For people with ketamine-related bladder damage, medical evaluation and treatment are important alongside addiction support. Inspire Recovery can help coordinate referrals to appropriate medical care alongside outpatient treatment.

If ketamine use has become a concern, our admissions team can help you understand what options are available. LGBTQ-affirming outpatient care in West Palm Beach, Florida.

Sources

  • National Institute on Drug Abuse (NIDA). Ketamine DrugFacts. Retrieved from nida.nih.gov.
  • Drug Enforcement Administration (DEA). Ketamine. Retrieved from dea.gov.
  • Cottrell, A.M., et al. (2008). The Risks Associated with the Use of Ketamine as a Recreational Drug. Addiction Research & Theory.
  • MedlinePlus (U.S. National Library of Medicine). Ketamine. Retrieved from medlineplus.gov.