Alcohol poisoning happens when you drink more alcohol than your liver can process, causing your blood alcohol concentration (BAC) to rise to dangerous levels. Your liver breaks down alcohol at a fixed rate of about one standard drink per hour, and there’s no way to speed that up. When alcohol enters your bloodstream faster than your liver can clear it, the excess circulates through your body and begins shutting down basic brain functions, including the ones that keep you breathing.
Why Your Body Can’t Keep Up
The core problem is a mismatch between how fast alcohol enters your blood and how fast your liver removes it. Your liver clears alcohol at a constant rate of about 0.015% BAC per hour, regardless of your size, sex, or body type. That rate doesn’t change whether you’ve had two drinks or twelve. So if you’re drinking faster than one standard drink per hour, your BAC keeps climbing with every sip.
At a BAC of 0.08%, you’re legally impaired. At 0.30% to 0.40%, you’re in the range of alcohol poisoning and likely to lose consciousness. Above 0.40%, the risk of coma and death from respiratory failure becomes very real. At 0.45% and above, alcohol can directly cause the brain to stop regulating vital functions like breathing and circulation.
These numbers aren’t abstractions. About 21,800 people die from alcohol-related poisoning each year in the United States, and deaths from excessive alcohol use rose 29% between 2016 and 2021.
The Drinking Patterns That Cause It
Binge drinking is the most common path to alcohol poisoning. The NIAAA defines binge drinking as consuming enough to reach a BAC of 0.08% or higher, which typically means five or more drinks for men or four or more for women within about two hours. Alcohol poisoning usually involves drinking well beyond that threshold.
Drinking games, shots taken in rapid succession, and challenges that involve consuming large amounts in a short window are particularly dangerous. Because alcohol continues to absorb into your bloodstream even after you stop drinking, a person who downs several shots in quick succession may feel fine for a few minutes before their BAC spikes sharply. This delay is part of what makes alcohol poisoning so unpredictable.
It’s worth knowing what counts as “one drink.” In the U.S., a standard drink contains about 0.6 fluid ounces of pure alcohol. That’s a 12-ounce beer at 5% alcohol, a 5-ounce glass of wine at 12%, or a 1.5-ounce shot of liquor at 40%. Many cocktails and mixed drinks contain two or three standard drinks in a single glass, and strong craft beers can contain nearly double the alcohol of a regular beer. People often undercount how much they’ve actually consumed.
Factors That Raise Your Risk
Not everyone reaches a dangerous BAC at the same pace. Several factors determine how quickly alcohol hits your system.
Empty stomach. Alcohol absorbs significantly faster when you haven’t eaten. Food, especially solid meals, slows the rate at which alcohol leaves your stomach and enters your small intestine, where most absorption happens. Drinking on an empty stomach lets alcohol flood into your bloodstream with almost no delay.
Type of drink. Higher-concentration beverages raise your BAC faster. Research published in Alcoholism: Clinical and Experimental Research found that beer and wine are absorbed more slowly than spirits, and that peak BAC after drinking beer is significantly lower than after consuming the same amount of alcohol as vodka. The concentration of alcohol in a spirit like vodka is roughly four times that of beer, so the alcohol reaches your blood more quickly.
Speed of drinking. Because your body absorbs alcohol faster than it eliminates it, the speed at which you drink is one of the strongest predictors of how high your BAC will go. Two drinks in ten minutes produces a very different result than two drinks over two hours, even though the total alcohol is identical.
Body size and composition. Smaller people generally reach higher BACs from the same amount of alcohol. Women tend to reach higher BACs than men of the same weight, partly because of differences in body water content and metabolism.
Mixing Alcohol With Other Substances
Combining alcohol with certain drugs dramatically lowers the threshold for a life-threatening reaction. Opioids and benzodiazepines (commonly prescribed for anxiety and sleep) are especially dangerous because they suppress breathing through the same pathways alcohol does. The CDC warns that drinking alcohol while using these substances “can make it hard to breathe, which can damage your brain and other organs.”
This applies to over-the-counter medications too. Many cold medicines, sleep aids, and pain relievers carry warnings about alcohol interactions. When these substances combine, the sedative effects multiply rather than simply add up, so a BAC that might otherwise be survivable can become fatal.
Warning Signs of Alcohol Poisoning
Alcohol poisoning doesn’t always look like what people expect. Someone who is dangerously intoxicated may not be loud or visibly distressed. They may be quiet, unresponsive, or appear to be sleeping. The key signs to watch for are:
- Slow breathing: fewer than eight breaths per minute
- Irregular breathing: gaps of more than 10 seconds between breaths
- Loss of consciousness with inability to be woken up
- Vomiting while unconscious or semi-conscious
- Low body temperature (hypothermia), sometimes with pale or bluish skin
- Seizures
A person doesn’t need to show all of these signs to be in danger. Even one or two, particularly slow or irregular breathing combined with unconsciousness, can signal a medical emergency.
What to Do if Someone Has Alcohol Poisoning
Call emergency services immediately. Alcohol poisoning can kill, and there is no home remedy that reverses it. Coffee, cold showers, and “walking it off” do nothing to lower BAC or protect the brain.
While waiting for help, turn the person on their left side in what’s called the recovery position. This keeps their airway clear and prevents them from choking if they vomit. Their head should be supported, and their top knee should be bent forward to keep them from rolling onto their stomach. Do not leave them alone, even for a few minutes. A person’s BAC can continue rising after they’ve stopped drinking, meaning their condition can worsen even though no more alcohol is being consumed.
One of the most dangerous myths about alcohol poisoning is that someone just needs to “sleep it off.” An unconscious person who vomits can inhale the vomit into their lungs, blocking their airway. This is one of the most common ways alcohol poisoning becomes fatal.