A drug overdose is a medical emergency. It occurs when the body is exposed to a quantity of a substance — or a combination of substances — that overwhelms its capacity to process and eliminate them safely, producing toxic effects that can cause permanent organ damage, brain damage, or death.
In 2022, more than 107,000 Americans died from drug overdoses — the majority involving opioids, and the majority of those involving illicitly manufactured fentanyl. Behind each of those deaths is a moment when the right intervention could have changed the outcome.
What Is a Drug Overdose?
A drug overdose occurs when the amount of a substance in the body exceeds what the body’s metabolic and physiological systems can handle safely. The specific mechanism varies by substance — opioids cause overdose primarily through respiratory depression, stimulants through cardiovascular toxicity, and alcohol through CNS depression and aspiration — but the common feature is that normal physiological functioning is dangerously disrupted.
The rise of illicitly manufactured fentanyl and fentanyl analogues has dramatically changed the overdose landscape. Fentanyl is approximately 100 times more potent than morphine, and its inconsistent distribution in counterfeit pills and adulterated drugs means that a dose that appears normal can be lethal.
What Happens During an Opioid Overdose
Opioids produce their effects by binding to mu-opioid receptors in the brainstem regions that regulate breathing. In overdose quantities, the depression of respiratory drive produces progressively slower and shallower breathing — and ultimately respiratory arrest.
The progression of an opioid overdose follows a recognizable pattern: the person becomes increasingly sedated and unresponsive, breathing slows and becomes shallow or irregular, skin becomes pale, cool, and clammy, lips and fingernails may turn blue or purple from oxygen deprivation (cyanosis), pupils constrict to pinpoints, and a distinctive slow, rattling breathing sound develops as the airway becomes partially obstructed.
Naloxone (brand name Narcan) is an opioid antagonist that rapidly reverses opioid overdose by displacing opioids from their receptors. It is available without a prescription at most pharmacies in the United States. Because fentanyl overdoses can be particularly severe, multiple doses of naloxone may be required.
What Happens During an Alcohol Overdose
Alcohol poisoning occurs when blood alcohol concentration reaches levels that severely depress CNS function. Signs include confusion and severe disorientation, inability to remain conscious or be awakened, vomiting while unconscious, slow or irregular breathing, seizures, and pale or bluish skin.
Alcohol poisoning is a medical emergency. The commonly repeated advice to “let someone sleep it off” is dangerous — a person unconscious from alcohol poisoning can continue absorbing alcohol, aspirate vomit, stop breathing, or experience a seizure.
What Happens During a Stimulant Overdose
Stimulant overdose presents through cardiovascular and neurological toxicity rather than respiratory depression. Signs include extreme agitation and confusion, chest pain, irregular or racing heartbeat, severely elevated blood pressure, hyperthermia, seizures, and stroke. There is no reversal agent equivalent to naloxone — treatment is supportive. Emergency services should be called immediately.
What Happens During a Benzodiazepine Overdose
Benzodiazepine overdose alone is less likely to be fatal than opioid or alcohol overdose in otherwise healthy adults. However, benzodiazepines combined with opioids or alcohol produce synergistic CNS and respiratory depression that dramatically elevates overdose risk and fatality — a combination that accounts for a significant proportion of polydrug overdose deaths.
Long-Term Consequences of Surviving an Overdose
Brain damage from oxygen deprivation is the most serious potential consequence of overdose survival. Even a brief period of reduced oxygen delivery to the brain can cause permanent neurological damage — affecting memory, cognition, motor function, and personality depending on the regions affected.
Organ damage — particularly to the liver and kidneys — can result from the direct toxic effects of substances and from the physiological stress of the overdose event itself.
Psychological impact. Surviving an overdose is a traumatic experience. The period immediately following an overdose is a clinically significant window for treatment engagement.
What to Do If Someone Is Overdosing
Call 911 immediately. This is the first and most important action. Do not wait to see if the person recovers on their own.
Administer naloxone if available and an opioid overdose is suspected. Naloxone is safe to administer even if you are not certain opioids are involved. If the person does not respond to the first dose within 2–3 minutes, administer a second dose.
Place the person in the recovery position if they are unconscious but breathing — on their side with their mouth facing down to prevent aspiration of vomit. Never leave an unconscious person on their back.
Do not give the person food, water, or coffee in an attempt to sober them up. This does not accelerate metabolism and creates additional aspiration risk.
Do not leave the person alone. Stay with them until emergency services arrive. Many states have Good Samaritan laws that provide legal protection for people who call 911 to report an overdose.
Overdose as a Turning Point
The period immediately following an overdose is a window of elevated motivation for change. Our admissions team is available 24 hours a day. Verify your insurance online, or call Numa Recovery Centers at (844) 748-4455. Our treatment programs and what we treat pages provide more information on the levels of care available.
Frequently Asked Questions
What are the signs of a drug overdose?
Signs vary by substance. Opioid overdose produces unconsciousness, pinpoint pupils, slow or stopped breathing, blue lips or fingernails, and cold clammy skin. Alcohol overdose produces unconsciousness, slow irregular breathing, pale or bluish skin, and vomiting. Stimulant overdose produces chest pain, racing or irregular heartbeat, extreme agitation, seizures, and hyperthermia. Any of these signs require immediate emergency medical response — call 911.
Can you survive a drug overdose?
Yes — many people survive drug overdoses, particularly when emergency intervention is timely. Naloxone can rapidly reverse opioid overdoses. However, survival does not guarantee full recovery without consequences — brain damage from oxygen deprivation is possible even with survival.
What should you do if someone overdoses?
Call 911 immediately. If an opioid overdose is suspected and naloxone is available, administer it. Place an unconscious but breathing person on their side in the recovery position. Stay with the person until emergency services arrive.
Does overdosing cause brain damage?
Overdose involving respiratory depression or arrest can cause brain damage through oxygen deprivation. The severity depends on how long the brain was deprived of oxygen. Even brief periods of significant oxygen deprivation can cause permanent neurological damage.
Is a drug overdose always fatal?
No. Many people survive drug overdoses, particularly with timely emergency intervention. However, overdose is always a medical emergency with real risk of death or permanent injury.
Medically reviewed by Dr. Ariella Morrow, MD, Medical Director, Numa Recovery Centers. Board Certified in Internal Medicine, MPH. Last reviewed: August 2026.
References: 1. CDC. (2023). Drug Overdose Deaths in the United States. 2. Rudd RA, et al. (2016). MMWR, 65(5051), 1445–1452. 3. Strang J, et al. (2003). BMJ, 326(7386), 452–454. 4. Zimmerman JL. (2012). Critical Care Clinics, 28(4), 517–526.
