Key takeaway
A ketamine overdose is a life-threatening medical emergency requiring immediate action. Call 911 without delay if you suspect an overdose.
The risk of a fatal overdose increases dramatically when ketamine is mixed with other substances, especially central nervous system depressants like alcohol, opioids, or benzodiazepines.
Key signs of an overdose include dangerously slowed breathing, loss of consciousness, seizures, and extreme confusion or agitation.
There is no reversal agent for a ketamine overdose; hospital treatment is supportive and focuses on managing vital functions until the drug is metabolized.
Ketamine is a dissociative anesthetic that has been used in medical settings for decades. In recent years, it has gained recognition for its off-label use in treating severe depression and other mental health conditions under strict medical supervision. However, its powerful effects also make it a substance of misuse.
An overdose occurs when a toxic amount of the drug overwhelms the body’s ability to process it, leading to a cascade of dangerous symptoms. Understanding the signs of a ketamine overdose and knowing how to respond is crucial for anyone using this substance, either medically or recreationally. This article provides a clinical overview of the symptoms, causes, and emergency procedures related to a ketamine overdose.
Can you overdose on ketamine?
If you use Ketamine incorrectly then overdosing can happen. Overdose of ketamine makes your body experience an overwhelming impact which may result in severe health risks such as respiratory and neurological toxicity.
People who are not familiar with Ketamine dosing may take an extra amount which could lead to overdose.
What are the certain circumstances in which there is a high risk of overdose:
- If you use Ketamine recreationally in large amounts it causes high levels of ketamine accumulation in your body.
- Secondly, if you mix the drug with other substances causing overdose, such as opioids and gamma-hydroxybutyrate (GHB).
It’s possible to overdose the Ketamine substance but it can result in serious health complications, even death. So if you are prescribed ketamine, play it safe and consider using it under medical supervision.
What are the symptoms of a ketamine overdose?
The signs of a ketamine overdose can vary depending on the dose, the individual’s tolerance, and whether other drugs were consumed. Symptoms can be both physical and psychological.
Physical symptoms
- Respiratory Depression: This is the most dangerous sign. Breathing may become dangerously slow, shallow, or stop altogether (apnea).
- Cardiovascular Changes: Chest pain, dangerously low or high blood pressure, and a slowed heart rate (bradycardia) can occur.
- Loss of Consciousness: The person may be unresponsive, difficult to wake, or in a coma.
- Loss of Motor Control: Muscle rigidity, loss of coordination, or an inability to move.
- Uncontrolled Eye Movements: Repetitive, uncontrolled movements of the eyes (nystagmus).
- Gastrointestinal Distress: Nausea and vomiting.
- Seizures: Uncontrolled electrical disturbances in the brain.
- Coma: A state of prolonged unconsciousness.
Psychological symptoms
- Profound Sedation: A decreased level of consciousness or stupor.
- Severe Dissociation: A complete detachment from reality, often referred to as a “K-hole.”
- Cognitive Impairment: Confusion, delirium, and amnesia (memory loss).
- Extreme Emotional States: Severe agitation, paranoia, aggression, or violent behavior.
- Hallucinations: Distortions in the perception of sight, sound, and touch.
Ketamine can impact your mental and physical functioning. Although the intensity of the side effects depends upon dosage:
| Type | Low to moderate | High |
| Heart Related | Chest pain, increased or decreased heart rate | Chest pain, dangerous changes in BP (blood pressure) or Heart rate |
| Central Nervous System (CNS) | Agitation, alterations in sight, sound, shapes, flashbacks, lethargy loss of coordination, and numbness | Amnesia (memory loss), coma, delirium, high body temperature, fear, and violent behavior |
| Gastrointestinal | Nausea and vomiting | Same |
| Renal | Kidney toxicity (with chronic abuse) | Same |
| Respiratory | Increased breathing rate | Respiratory depression |
| Other | Salivation (IV use), tears, rapid eye movement, and spasms of the larynx | Severe anxiety, fear, panic, anxiety, exaggerated strength, aggression, muscle rigidity, respiratory depression, death |
Emergency what to do for a suspected overdose
If you believe someone has overdosed on ketamine, treat it as a medical emergency. Your immediate actions can save a life.
- Call 911 Immediately: This is the most critical step. Provide the operator with your exact location and state clearly, “I suspect a ketamine overdose.” Give them as much information as you can about the person’s age, symptoms, and what they may have taken.
- Do Not Leave The Person Alone: Stay with them until emergency services arrive. Their condition can change rapidly.
- Place Them in the Recovery Position: If the person is unconscious or vomiting, gently roll them onto their side. This helps keep their airway open and prevents them from choking.
- Try to Keep Them Calm: If the person is conscious but agitated or frightened, speak to them in a calm, reassuring voice and try to keep their environment quiet.
- Provide Information to Paramedics: Tell the emergency responders everything you know about what was taken, including the amount and if other drugs or alcohol were involved. This information is vital for treatment.
What causes a ketamine overdose?
An overdose is primarily caused by taking a toxic amount of ketamine, but several factors dramatically increase this risk.
- Mixing With Other Substances: This is the leading cause of fatal ketamine-related overdoses. Combining ketamine with central nervous system depressants like alcohol, opioids, or benzodiazepines can lead to catastrophic respiratory failure.
- Recreational Use: Using high doses to achieve a “K-hole” state is extremely dangerous and can easily lead to an overdose.
- Contaminated Street Drugs: Illicitly obtained ketamine may be mixed with other lethal substances, such as fentanyl, without the user’s knowledge, making any dose potentially fatal.
- Use Without Medical Supervision: Administering the drug outside of a clinical setting where dosage cannot be accurately measured and vital signs are not monitored.
The dangers of mixing ketamine with other substances
The risk of a life-threatening overdose is highest when ketamine is combined with other drugs. Combining substances can create a synergistic effect, where the combined impact is far greater than the sum of the individual drugs.
According to the study, a majority of ketamine-related emergency room visits involved the use of other substances, with alcohol being the most common.
- With Alcohol, Opioids, or Benzodiazepines: Mixing ketamine with these central nervous system depressants dramatically increases the risk of severe respiratory depression, which can lead to coma and death.
- With Stimulants (Cocaine, Amphetamines): This combination can place extreme stress on the heart, leading to dangerous changes in blood pressure, heart rate, and potentially cardiac arrest.
What happens at hospital how an overdose is treated
There is no specific antidote or reversal agent for a ketamine overdose. Treatment in a hospital emergency room is focused on supportive care to keep the person alive while their body processes the drug. This includes:
- Vital Signs Monitoring: Continuous monitoring of heart rate, blood pressure, and blood oxygen levels.
- Respiratory Support: This is the top priority. It may involve providing supplemental oxygen or, in severe cases, inserting a breathing tube (intubation) and using a ventilator to breathe for the patient.
- Symptom Management: Administering IV fluids to maintain hydration and medications like benzodiazepines to control seizures or severe agitation.
After an overdose the path to recovery
Surviving an overdose is the first step. The aftermath can present its own set of challenges, both physical and psychological.
- Physical Recovery: Depending on the severity, a person may experience short-term kidney or bladder issues. If breathing was severely compromised, there is a risk of hypoxic brain injury from lack of oxygen.
- Psychological Impact: A non-fatal overdose can be a profoundly traumatic experience. It is common to experience intense anxiety, fear, and psychological distress afterward. This event often highlights an underlying substance use issue or mental health condition that requires professional help.
The Need for Follow-Up Care: A comprehensive evaluation with a medical doctor and a mental health professional is crucial after an overdose to address the root causes and create a plan for recovery.
How to prevent a ketamine overdose
Prevention is the most effective way to avoid the dangers of an overdose.
- Use Only Under Medical Supervision: Only use ketamine that has been prescribed by and administered in a controlled clinical setting.
- Follow Prescription Guidelines: Never take more than the prescribed dose.
- Avoid Illicit Ketamine: Do not use ketamine obtained from illicit sources, as its purity and dosage are unknown.
Do Not Mix Substances: Never combine ketamine with alcohol or other drugs.
NeuroGlow approach to managing ketamine overdose and recovery
- Professional administration is key to safety: Receiving treatment from trained experts is crucial, with Paul L noting, “These people do the infusion protocol right,” and Jacki Bishop highlighting that the nurses are “well-trained.”
- A controlled environment minimizes risk: A clinical setting ensures patient well-being, creating what Justin Papen describes as a “calm and safe environment” where, as Reese Thompson felt, you are not “nervous or on edge.”
At NEUROGLOW in North Texas, we understand that an overdose is a critical turning point. Our approach is to provide a safe and structured path to recovery for individuals who have been affected by ketamine misuse. We offer compassionate, evidence-based addiction care and medically supervised infusion therapies in a regulated clinical setting. Our focus is on addressing the underlying mental health conditions that often drive substance misuse, helping you or your loved one build a foundation for lasting wellness.
Conclusion
A ketamine overdose is a preventable medical emergency where immediate action is critical. The danger is highest not from ketamine alone, but from its combination with other substances. Understanding the signs, knowing to call 911 without hesitation, and seeking professional follow-up care after the event are essential steps. If you are using ketamine, do so only under the strict guidance of a medical professional to ensure your safety and well-being.
FAQs
What is a “K-hole”?
A “K-hole” is a slang term for a dangerous, dissociative state from a high ketamine dose where a person is unable to interact with reality.
Is there an antidote for a ketamine overdose?
No, there is no antidote; medical treatment is supportive, focusing on managing the patient’s breathing and vital signs until the drug wears off.
What is the difference between medical and street ketamine?
Medical ketamine is pure with a precise dose, while street ketamine is unregulated and can be dangerously contaminated with lethal substances like fentanyl.
Can I die from a ketamine overdose?
Death can be possible but it usually happens if Ketamine is the only drug you take. Moreover, if you combine it with other substances, there is a high risk of death.
References:
FDA
University of Groningen
NCBI
https://www.ncbi.nlm.nih.gov/books/NBK541087/
NIMH
https://www.nimh.nih.gov/health/statistics/suicide
FDA
FDA
NIDA
https://nida.nih.gov/research-topics/psychedelic-dissociative-drugs#dangerous-contaminants
NPR
https://www.npr.org/2023/12/15/1219761972/what-is-ketamine-friends-matthew-perry
FDA
NIH
https://pmc.ncbi.nlm.nih.gov/articles/PMC6197107/
Considering treatment? Learn more about ketamine therapy in DFW at NeuroGlow, or book a free consultation with our team.
Exploring IV ketamine therapy? NeuroGlow provides physician-supervised ketamine infusions at three DFW clinics, with an integration-focused care plan. Learn about IV ketamine at NeuroGlow or call 469-218-4410.
