Dangers of Mixing Ketamine and Alcohol

baggie of ketamine with glass of alcohol
Combining ketamine and alcohol can lead to negative reactions, some of which can be life-threatening. Users of this dangerous mix may be at increased risk of urinary tract issues, memory loss, slowed breathing, coma, and even death.

Symptoms of an overdose on ketamine and alcohol can include unconsciousness, slowed heart rate, impaired motor function, vomiting, and clammy skin. An overdose requires immediate medical attention.

What Is Ketamine?

Ketamine was first synthesized in the 1960s and began being used in medical settings as a dissociative anesthetic agent shortly thereafter. The Food and Drug Administration (FDA) approved it in 1970, and it continues to be used as an anesthetic induction agent and procedural sedative for children and adults and, even more commonly, in veterinary medicine.1

Ketamine’s utility, however, has expanded beyond its FDA-approved use as an anesthetic. It is sometimes prescribed for moderate to severe acute and chronic pain, and it is increasingly used as an antidepressant in patients who have not responded to other forms of treatment.2

Users may also feel detached from their body, an experience referred to as being in the ‘k-hole.’

While pharmaceutical ketamine is administered as an injectable solution, illicitly produced ketamine is often encountered as a powder or a liquid. In recreational use, the powder is cut into lines and snorted or smoked—either alone or in combination with marijuana or tobacco. Liquid ketamine may be injected or mixed into drinks.3

Ketamine purchased illegally is often cut with other drugs, including methamphetamine, amphetamine, Ecstasy (MDMA), and cocaine.3

Depending on the specific route of ingestion, the effects of the drug may be felt within a couple of minutes. The user may have distortions in sight or sound, and feel disconnected from reality. Hallucinations are common under the influence of the drug and may last 30 minutes to 60 minutes. Users may also feel detached from their body, an experience referred to as being in the “k-hole.”3,12

Other effects include agitation, depression, trouble thinking clearly, amnesia, and loss of consciousness. Users may become unresponsive to outside stimuli and experience involuntary rapid eye movements, dilated pupils, salivation, tearing, and muscle stiffness.3

How Does Ketamine Work?

Ketamine binds to and blocks activation of a special brain protein known as the N-methyl-D-aspartate (NMDA) receptor. Normally, the NMDA receptor interacts with and is activated by glutamate—an excitatory neurotransmitter in the brain that plays a role in learning and memory. Blocking glutamatergic activation of the NMDA receptor can affect attention, learning, and memory, and ketamine’s antagonizing effects on this receptor are thought to also play a role in its anesthetic and pain-relieving properties.4,5,6

How Does Alcohol Work?

Roughly 20% of the alcohol consumed in a drink is absorbed by the stomach, with the remaining 80% absorbed by the small intestine. It passes from the digestive tract into the bloodstream, where it is transported to all parts of the body, including the brain.7,8

Several neurochemical processes are influenced by the presence of alcohol. On a broad level, these acute, alcohol-related brain changes include a heightened effect of inhibitory neurotransmitters and a decreased effect of excitatory neurotransmitters. Among its diverse group of physiological targets, alcohol affects the activity of both inhibitory (GABA) and excitatory (glutamate) neurotransmitters. Specifically, it binds to GABA receptors and amplifies the inhibitory signaling that results when GABA binds to them—resulting in a net reduction of certain types of neural activity. Conversely, alcohol also reduces glutamate’s excitatory action on NMDA receptors (the same receptors that ketamine inhibits).8,9

Though the precise mechanism isn’t fully understood, alcohol use is also accompanied by an increase in dopamine activity. Dopamine is commonly thought of as the brain’s “pleasure chemical,” though more accurately, its actions are thought to reinforce certain behaviors (e.g., drinking) that themselves are associated with pleasurable effects.8

What Happens When You Mix Ketamine and Alcohol?

There is a real danger in mixing ketamine and alcohol.

Because ketamine and alcohol affect different neurotransmitter systems in a way that ultimately results in increased inhibitory brain signaling, some of the physiological effects of combining ketamine and alcohol are synergized (i.e., similar effects are amplified), by the simultaneous use of both substances. Studies have found that ketamine produces subjective alcohol-like effects in users, which further suggests that combining the substances could result in over-intoxication.10 closeup of a blurred young caucasian man curled up with his hands in his head

Using ketamine with alcohol increases the risk of memory loss, slowed breathing, coma, and death. Users may be unaware of how much the substances are affecting them due to combined intoxication. In examining the death of a British teenager, the pathologist in the case stated that the alcohol/ketamine combination was a contributing factor in her death: “In combination, she actually caused more damage than if she had taken ketamine alone.”7,11,12

In the case of overdose deaths from recreational use of ketamine, forensic investigators have found concentrations of ketamine in the blood ranging from 0.1 to 7.0 mg/liter when used in conjunction with other drugs, including alcohol. Of 23 deaths in the United Kingdom between 1993 and 2006 in which ketamine was identified in the user’s system, only 4 of those involved only ketamine; the other 19 were attributed to a mixing of substances. A study in New York City found similar rates, with 12 out of 15 deaths attributed to polydrug overdoses involving ketamine.13

Finally, ketamine use may increase the risk of certain urinary tract issues, including irreversible urologic damage. The Global Drug Survey found that people who drank alcohol while they used ketamine were much more likely to report problems such as increased urinary frequency, pain with urination, lower abdominal pain, and blood in their urine. Avoiding the combination of ketamine and alcohol reduces the risk of bladder and gastrointestinal problems.14

Treatment of Overdose

Signs of a ketamine/alcohol overdose can include:3,6,15

  • Impaired motor function.
  • High blood pressure.
  • Respiratory problems.
  • Unconsciousness.
  • Mental confusion.
  • Vomiting.
  • Seizures.
  • Slowed heart rate.
  • Clammy skin.
  • Low body temperature.

If you observe the signs of overdose in yourself or someone else, call 911 immediately. In the meantime, monitor the person’s vital signs and perform CPR if you’re trained in how to do so. Try to find out how much ketamine and alcohol the person used, and when.16

In the emergency room, medical staff may perform procedures such as:16

  • Airway and breathing support through a tube through the mouth (trachea) or a breathing machine (ventilator).
  • Blood and urine tests.
  • CT scans of the head, neck, and other areas.
  • Chest X-ray.
  • Electrocardiogram (ECG).
  • IV fluids.

The likelihood of surviving a ketamine/alcohol overdose will depend on how much of each substance the person took, their age, their health, and other factors.

In sum, users should avoid mixing ketamine and alcohol. The dangers of each substance are compounded when they are combined, and the effects can be fatal.

If you struggle with polysubstance abuse of any kind, help is available. With comprehensive treatment, you can achieve a stable life in recovery.


[1]. Drug Bank. (2019). Ketamine.

[2]. Jonkman, K. et al. (2017). Ketamine for pain. F1000 Research, 6, F1000 Faculty Rev-1711.

[3]. Drug Enforcement Administration. (2017). Drugs of Abuse.

[4]. Zanos, P. et al. (2018). Ketamine and Ketamine Metabolite Pharmacology: Insights into Therapeutic Mechanisms. Pharmacological Reviews, 70(3), 621-660.

[5]. Liou, S. (2011). About Glutamate Toxicity. Stanford University Huntington’s Outreach Project.

[6]. National Institute on Drug Abuse. (2014). Club Drugs (GHB, Ketamine, and Rohypnol).

[7]. UC Santa Cruz. (2015). Alcohol and Your Body.

[8]. McGill University. How Drugs Affect Neurotransmitters: Alcohol.

[9]. Victoria State Government. (2012). Alcohol and the Brain.

[10]. Krystal, J. (1998). Dose-related ethanol-like effects of the NMDA antagonist, ketamine, in recently detoxified alcoholics. Archives of General Psychiatry, 55(4), 354-360.

[11]. Dixon, K. (2014). Ketamine death of public schoolgirl an ‘act of stupidity which destroyed family.’ The Telegraph.

[12]. Alcohol and Drug Foundation. Ketamine.

[13]. Kalsi, S., Wood, D., and Dargan, P. (2011). The epidemiology and patterns of acute and chronic toxicity associated with recreational ketamine use. Emerging Health Threats, 4.

[14]. Global Drug Survey. (2014). The High-Way Code: Ketamine.

[15]. National Institute on Alcohol Abuse and Alcoholism. (2018). Understanding the Dangers of Alcohol Overdose.

[16]. U.S. National Library of Medicine, Medline. (2019). Drug use first aid.

Last Updated on December 9, 2019
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Dan Wagener
Dan Wagener is a Senior Web Content Editor at American Addiction Centers.
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