Alcohol poisoning happens when you drink so much alcohol in a short period that your blood alcohol concentration (BAC) rises to toxic levels, overwhelming your body’s ability to process it. At a BAC of 0.30% or higher, coma and death become real possibilities. It doesn’t require chronic drinking or addiction. A single episode of heavy drinking can do it.
What Happens in Your Body
Your liver can only break down about one standard drink per hour. A standard drink is 12 ounces of regular beer, 5 ounces of wine, or 1.5 ounces of liquor, each containing roughly 14 grams of pure alcohol. When you drink faster than your liver can keep up, alcohol accumulates in your bloodstream and begins suppressing your central nervous system in a dose-dependent way.
At moderate levels, this suppression is what creates the familiar feeling of being drunk: lowered inhibitions, slurred speech, impaired coordination. But as BAC climbs, alcohol starts interfering with the part of your brainstem that controls involuntary functions like breathing. It does this partly by increasing levels of a chemical called adenosine in the brain, which directly suppresses your breathing drive. At a BAC between 0.15% and 0.30%, breathing becomes inadequate, you may lose bladder control, and consciousness starts slipping. Above 0.30%, your brain can no longer maintain the basic functions that keep you alive.
How Drinking Too Fast Causes It
The most common path to alcohol poisoning is binge drinking, defined as five or more drinks for men or four or more drinks for women within about two hours. But alcohol poisoning typically involves far more than that threshold. Drinking games, shots consumed in rapid succession, or chugging liquor straight from a bottle can push BAC into dangerous territory before a person even feels the full effects, because alcohol continues absorbing into the bloodstream for 30 to 90 minutes after you stop drinking. This means someone can seem “just very drunk” and then deteriorate significantly even after they’ve stopped.
Hard liquor poses a particular risk because it delivers a large amount of alcohol in a small volume. A person can consume a lethal dose of spirits in minutes, while drinking the equivalent amount in beer would take much longer and involve a far larger volume of liquid.
Why Some People Are More Vulnerable
Several factors affect how quickly alcohol builds up in your blood:
- Body size and weight. A smaller person reaches a higher BAC from the same number of drinks compared to a larger person, simply because there’s less body mass to distribute the alcohol through.
- Biological sex. Women generally absorb more alcohol and take longer to process it than men, even at the same body weight. This is partly because women tend to have proportionally more body fat and less water content, which concentrates alcohol in the bloodstream.
- Food in the stomach. Drinking on an empty stomach allows alcohol to pass rapidly into the small intestine and absorb much faster. A full meal slows that process considerably.
- Tolerance and drinking speed. Someone without much drinking experience has no built-up tolerance, so the same amount of alcohol hits harder. But tolerance is deceptive: a person with high tolerance may drink enough to reach a toxic BAC without feeling as impaired along the way.
Warning Signs to Recognize
Alcohol poisoning looks different from someone who’s just had too much to drink. The key signs, according to the Mayo Clinic, include slow breathing (fewer than eight breaths per minute), irregular breathing with gaps of more than 10 seconds between breaths, vomiting, seizures, confusion, low body temperature, skin that looks blue or gray or pale, and difficulty staying conscious.
A person who is unconscious and cannot be woken up is in immediate danger. “Sleeping it off” is not a safe strategy when someone shows these symptoms, because BAC can continue rising after the last drink, and the body’s protective reflexes (like the gag reflex) may be too suppressed to prevent choking.
How It Kills
Alcohol poisoning can be fatal through several mechanisms, sometimes more than one at the same time.
The most direct cause of death is respiratory failure. When alcohol suppresses the brainstem enough, breathing simply slows down and stops. But choking on vomit is equally dangerous and more common than many people realize. When someone vomits while unconscious or semiconscious, inhaled stomach acid severely damages lung tissue even before any infection sets in. This is called aspiration, and it can cause rapid lung inflammation that makes breathing impossible. The Merck Manual notes that this type of lung injury can occur whenever a person inhales vomit while not fully awake, and alcohol overdose is one of the most common scenarios.
Other fatal complications include severe dehydration, dangerous drops in blood sugar, hypothermia (alcohol dilates blood vessels, which accelerates heat loss), irregular heartbeat, and seizures. About 61,000 deaths per year in the U.S. are attributed to binge drinking or drinking too much on a single occasion, a category that includes alcohol poisoning alongside crashes, overdoses, and suicides.
What to Do If Someone Is in Danger
Call emergency services immediately if someone shows signs of alcohol poisoning. While waiting for help, the most important thing you can do is place the person in the recovery position: on their side, face angled slightly downward, with their head positioned a bit lower than their stomach. This allows vomit, mucus, or blood to drain out of the mouth rather than blocking the airway or being inhaled into the lungs. To get them there from lying on their back, move the arm closest to you out to the side in an L-shape, then use the person’s far hand to gently roll them toward you onto their side.
Do not leave them alone. Do not try to make them vomit. Do not give them coffee or put them in a cold shower, as these do nothing to lower BAC and hypothermia is already a risk.
What Happens at the Hospital
There is no quick fix for alcohol poisoning. The body simply has to process the alcohol, and hospital care focuses on keeping the person alive while that happens. This typically involves IV fluids to treat dehydration and stabilize blood sugar, oxygen delivered through a tube clipped to the nose, and heart monitoring. If breathing becomes too weak or unreliable, a breathing tube may be placed into the windpipe to maintain airflow mechanically. The length of stay depends on how high the BAC is and whether complications like aspiration or seizures have occurred, but most people with uncomplicated cases stabilize within several hours as their liver clears the alcohol.