Alcohol poisoning happens when you drink so much alcohol so quickly that your liver can’t keep up, and the excess alcohol in your bloodstream starts shutting down the parts of your brain that control breathing, heart rate, and body temperature. It typically occurs at a blood alcohol concentration (BAC) of 0.30% to 0.40%, roughly four times the legal driving limit. At levels above 0.40%, coma and death from respiratory failure become real possibilities.
This isn’t just “being really drunk.” It’s a medical emergency that killed nearly 22,000 people per year in the United States during 2020–2021, a sharp increase from about 15,000 per year just a few years earlier.
What Alcohol Does to Your Brain
Alcohol works on two systems in the brain simultaneously. First, it mimics the brain’s main calming chemical, GABA, by binding to GABA receptors and amplifying their inhibitory effect. This is what produces the relaxation, lowered inhibitions, and slowed reactions you feel after a couple of drinks. Second, it blocks the brain’s main excitatory chemical, glutamate, which normally keeps you alert and responsive. The combination is a double hit: your brain’s “slow down” signals get louder while its “speed up” signals get quieter.
At low to moderate levels, this mostly affects higher-order thinking, coordination, and judgment. But as BAC climbs, the suppression reaches deeper into the brain, eventually affecting the brainstem. The brainstem controls the functions you never have to think about: breathing rhythm, heart rate, temperature regulation, and protective reflexes like gagging and coughing. When alcohol saturates these areas, those automatic systems start failing.
Why the Liver Can’t Keep Up
Your liver processes alcohol at a fixed rate of roughly one standard drink per hour. A standard drink is 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of liquor. That rate doesn’t change no matter how much you’ve consumed. You can’t speed it up by drinking water, eating food after the fact, or exercising.
This means the math of alcohol poisoning is straightforward. If you consume six drinks in one hour, your liver handles one while five drinks’ worth of alcohol continues circulating. Every additional drink beyond what your liver can process raises your BAC further. Binge drinking, defined as four or more drinks for women or five or more for men within about two hours, pushes BAC to at least 0.08%. “High-intensity drinking,” which is double the binge threshold (eight or more for women, ten or more for men in one session), can push BAC into the danger zone where poisoning begins.
How Poisoning Progresses
Alcohol poisoning doesn’t hit all at once. It builds as BAC rises, and because alcohol continues absorbing from the stomach and intestines even after you stop drinking, BAC can keep climbing for 30 to 40 minutes after the last drink. Someone who seems “just very drunk” can deteriorate rapidly without consuming anything more.
The progression typically looks like this: confusion and disorientation come first, followed by vomiting. Then breathing becomes slow or irregular, sometimes dropping to fewer than eight breaths per minute or with gaps of ten seconds or more between breaths. Skin may turn pale or bluish, and body temperature drops because the brain can no longer regulate it properly. Seizures can occur. Eventually, the person loses consciousness and becomes unresponsive.
One of the most dangerous developments is the loss of the gag reflex. Vomiting is common during alcohol poisoning because the stomach is irritated, but if the brain can no longer trigger the gag reflex, a person who vomits while unconscious can inhale that vomit into their lungs. This aspiration can block the airway or cause a fatal interruption in breathing. Choking on vomit is one of the leading causes of death in alcohol poisoning cases.
Who Is at Higher Risk
Several factors determine how quickly alcohol builds up in your blood and how efficiently your body clears it. Body size matters: a smaller person reaches a higher BAC from the same number of drinks. Body composition plays a role too, because alcohol distributes through water in the body, not fat. People with more body fat and less water (proportionally) end up with more concentrated alcohol in their bloodstream.
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 a higher proportion of body fat and less of the stomach enzyme that begins breaking down alcohol before it enters the bloodstream. The result is that women typically reach higher BAC levels faster from the same amount of alcohol.
Drinking on an empty stomach accelerates absorption significantly. Food in the stomach slows the rate at which alcohol passes into the small intestine, where most absorption happens. Without that buffer, alcohol hits the bloodstream much faster. Mixing alcohol with other depressants, including certain medications, sleep aids, or opioids, compounds the suppression of the central nervous system and can trigger poisoning at lower BAC levels than alcohol alone would.
Why It Keeps Getting Worse After You Stop Drinking
A common and dangerous misconception is that someone will be fine once they stop drinking. Alcohol in the stomach and small intestine doesn’t enter the blood instantly. It absorbs gradually over time. So a person who has done several shots in quick succession may have a BAC that continues rising for 30 minutes or more, even with no additional alcohol. This is why someone can go from seemingly functional to unconscious in a short window. Putting someone “to bed to sleep it off” can be fatal if their BAC is still climbing.
What Happens at the Hospital
Emergency treatment for alcohol poisoning focuses on keeping the person alive while their body processes the alcohol. The immediate priority is making sure the airway stays clear and breathing continues. If breathing is dangerously slow or the person can’t protect their own airway, medical staff may need to assist with ventilation. Fluids are given through an IV to prevent dehydration and support circulation, and blood sugar is monitored closely because alcohol interferes with the body’s ability to maintain normal glucose levels.
There is no drug that reverses alcohol poisoning the way naloxone reverses an opioid overdose. The body simply has to metabolize the alcohol, and that takes time. Hospital care is about preventing death from breathing failure, choking, dehydration, or dangerously low body temperature while that process plays out. Recovery can take hours, and even after someone regains consciousness, impaired coordination and judgment may persist until BAC returns to zero.
Recognizing It in Someone Else
The signs that separate alcohol poisoning from ordinary intoxication include irregular or very slow breathing, vomiting while semiconscious or unconscious, seizures, skin that looks pale or bluish (especially around the lips and fingertips), and an inability to be woken up. A person who is unconscious and cannot be roused is in danger, even if they are still breathing. If you’re unsure whether someone is “just drunk” or in medical trouble, the safest assumption is that they need help. Turning them on their side (the recovery position) keeps the airway clearer if they vomit, but it is not a substitute for emergency medical care.