Alcohol poisoning is a medical emergency where the amount of alcohol in your bloodstream rises high enough to shut down the parts of your brain that control breathing, heart rate, and body temperature. It typically occurs at a blood alcohol concentration (BAC) between 0.30% and 0.40%, though it can happen at lower levels depending on your size, tolerance, and how quickly you drank. At a BAC above 0.40%, the risk of coma and death from respiratory failure climbs sharply, and a BAC over 0.45% can be fatal outright.
How Alcohol Shuts Down Vital Functions
Alcohol is a central nervous system depressant. In small amounts, it slows reflexes and loosens inhibitions. At toxic levels, it begins suppressing the brainstem, the region responsible for automatic functions you never think about: breathing, heart rate, temperature regulation, and the gag reflex. This is what makes alcohol poisoning fundamentally different from being “really drunk.” Your body’s life-support systems start failing.
Your breathing rate can drop below eight breaths per minute, or you may go ten seconds or more between breaths. Your heart rate becomes irregular. Your body temperature plummets, which is why people with alcohol poisoning often have clammy skin, bluish or pale coloring, and feel cold to the touch. At a BAC of 0.35%, the risk of slipping into a coma rises significantly because circulation and respiration are so compromised that the brain can no longer maintain consciousness.
What It Looks and Feels Like
Someone with alcohol poisoning won’t look like someone who just had a few too many drinks. The warning signs are distinct:
- Breathing changes: fewer than eight breaths per minute, or long pauses of ten seconds or more between breaths
- Skin changes: clammy, cold, pale, or bluish (especially around the lips and fingertips)
- Unresponsiveness: the person cannot be woken up, or responds only to painful stimuli like a pinch
- Vomiting while unconscious: the body may still try to purge alcohol, but the person can’t protect their own airway
- Seizures: caused by dropping blood sugar, dehydration, or direct toxicity to the brain
A person doesn’t need to show every one of these signs for the situation to be life-threatening. Even one or two, particularly slow breathing or unresponsiveness, signals a genuine emergency.
Why Blood Sugar Crashes During Poisoning
One of the less obvious dangers of alcohol poisoning is a severe drop in blood sugar. Alcohol disrupts the liver’s ability to produce glucose and triggers excess insulin release, which together can drive blood sugar dangerously low. In a clinical study of 49 patients hospitalized for acute alcohol intoxication, nearly a third were hypoglycemic, with blood sugar levels as low as 20 mg/dL (normal fasting levels are 70 to 100 mg/dL). Many of these patients were in a coma-like state or had severely clouded consciousness.
This matters because low blood sugar can cause seizures on its own, compounding the neurological suppression alcohol is already causing. It also means that a person who appears to be “sleeping it off” may actually be unconscious from both alcohol toxicity and dangerously low glucose. In the study, 13 of the 15 hypoglycemic patients regained consciousness almost immediately when given intravenous glucose, which underscores how treatable this complication is in a hospital setting and how dangerous it is without treatment.
The Choking Risk
Choking on vomit is one of the most common ways alcohol poisoning kills. Here’s why: alcohol suppresses the gag reflex, but it doesn’t suppress the stomach’s urge to purge. So a person who has passed out may vomit without the protective reflex that would normally prevent that vomit from entering the airway. If vomit reaches the lungs, it can block breathing entirely, causing asphyxiation. Even if the person survives, inhaling stomach contents into the lungs can lead to severe infection.
This is why the most important thing you can do for someone who is unconscious and may have alcohol poisoning is to turn them on their side. This simple position lets vomit drain out of the mouth rather than pooling at the back of the throat. Never leave an unconscious person on their back, and never leave them alone.
What Happens at the Hospital
Emergency treatment focuses on keeping the person alive while their body processes the alcohol. That means protecting the airway, supporting breathing, and stabilizing circulation. If blood sugar is dangerously low, intravenous glucose can reverse the effects quickly. Fluids help counter dehydration and support blood pressure.
In most cases, the body simply needs time and supportive care. There is no drug that speeds up alcohol metabolism, no antidote that neutralizes ethanol in the bloodstream. The liver processes alcohol at a fixed rate, roughly one standard drink per hour, and nothing changes that. Hospital care is about preventing the complications (choking, respiratory arrest, seizures, hypothermia) that can kill a person in the hours it takes for alcohol levels to fall.
Lasting Damage After Survival
Surviving alcohol poisoning doesn’t always mean walking away unharmed. When the brain is deprived of adequate oxygen, even briefly, permanent damage can result. Prolonged respiratory depression during alcohol poisoning can starve brain cells of oxygen, potentially leading to lasting problems with memory, concentration, and coordination. Severe or repeated episodes of hypoglycemia during intoxication can compound this damage.
Seizures triggered by alcohol poisoning also carry their own risks, including falls, head injuries, and further oxygen deprivation if breathing is interrupted. The degree of lasting harm depends on how long the brain went without adequate oxygen and how quickly the person received medical care.
Who Is Most at Risk
Alcohol poisoning is not rare. Excessive alcohol use causes roughly 178,000 deaths per year in the United States, and about 61,000 of those come from acute causes like binge drinking, which includes alcohol poisoning itself alongside alcohol-involved crashes and overdoses. Men account for roughly twice as many alcohol-related deaths as women: about 119,600 per year compared to 58,700. Most deaths involve adults 35 and older, but approximately 4,000 people under 21 die from excessive alcohol use each year.
Binge drinking is the most direct path to alcohol poisoning. That means consuming enough to raise your BAC to 0.08% or higher within about two hours, roughly four or five drinks, but poisoning-level BACs of 0.30% and above require far more than that consumed in a short window. Drinking games, chugging liquor, and mixing alcohol with other depressants all accelerate the risk. Smaller body size, lower tolerance, drinking on an empty stomach, and certain genetic variations in how your liver processes alcohol also lower the threshold.
What to Do If Someone Has Symptoms
Call emergency services immediately. Do not wait to see if the person “gets better.” Blood alcohol levels can continue rising for 30 to 40 minutes after the last drink, meaning someone who seems bad can get much worse even after they stop drinking.
While waiting for help, turn the person on their side to protect their airway. Stay with them. Do not try to give them food, water, or coffee. Do not put them in a cold shower. These common instincts do nothing to lower blood alcohol and can introduce new dangers like choking or hypothermia. The only thing that saves lives in alcohol poisoning is keeping the airway clear and getting professional medical support.