Alcohol poisoning slows down the body’s most basic survival functions: breathing, heart rate, temperature regulation, and the gag reflex. At a blood alcohol concentration (BAC) above 0.31%, you risk losing consciousness, stopping breathing, or falling into a coma. At 0.40% and above, the risk of death becomes significant. For an average person, reaching that level would require roughly 25 standard drinks, but individual tolerance varies widely based on body weight, sex, food intake, and how quickly you drank.
How Alcohol Poisoning Affects the Body
Alcohol is a central nervous system depressant, and at toxic levels it suppresses the brain’s ability to manage functions you never have to think about: breathing, keeping your heart beating at a steady pace, and maintaining your body temperature. Breathing can slow to fewer than eight breaths per minute or become irregular. Heart rate drops. These changes can starve the brain and organs of oxygen within minutes.
At the same time, alcohol causes blood vessels near the skin to dilate, which pulls heat away from your core. Body temperature can fall low enough to trigger cardiac arrest. Blood sugar also drops, sometimes severely enough to cause seizures. These secondary effects are easy to overlook because the person is often unconscious and unable to describe what they’re feeling.
Choking and Aspiration
One of the most immediate dangers is choking on vomit. Alcohol suppresses both the cough reflex and the gag reflex, which are the body’s two main defenses against inhaling foreign material into the lungs. If someone vomits while unconscious or semi-conscious, they may not be able to clear their airway. Inhaled vomit can block breathing entirely or settle into the lungs and cause aspiration pneumonia, a serious lung infection that can develop in the hours or days after the poisoning event even if the person initially seems to recover.
Brain Damage and Long-Term Effects
Surviving alcohol poisoning does not always mean a full recovery. The combination of oxygen deprivation (from suppressed breathing), dangerously low blood sugar, and direct toxic effects on brain cells can cause permanent brain damage. The extent depends on how long the brain went without adequate oxygen and how quickly medical treatment was received. Cognitive problems, memory impairment, and difficulty with coordination are among the lasting consequences that survivors sometimes face.
Even a single severe episode can leave damage that doesn’t fully reverse. The brain regions most vulnerable to oxygen deprivation are those involved in forming new memories and coordinating movement, which is why these functions tend to be affected first and recover slowest.
Warning Signs to Recognize
Alcohol poisoning doesn’t always look dramatic. The person may simply appear to be “sleeping it off.” The critical signs that distinguish poisoning from ordinary heavy intoxication include:
- Breathing rate below eight breaths per minute, or long gaps between breaths
- Unresponsiveness, meaning the person cannot be woken up by shouting or shaking
- Seizures
- Skin that looks pale, blue-tinged, or feels cold and clammy
- Vomiting while unconscious
A common and dangerous misconception is that someone who has passed out from drinking just needs to sleep. BAC can continue to rise for 30 to 40 minutes after the last drink as alcohol in the stomach is still being absorbed. This means a person who seems okay when they lie down can deteriorate quickly.
What Happens at the Hospital
Emergency treatment focuses on keeping the person alive while their body processes the alcohol. There is no drug that instantly sobers someone up. The medical team’s priorities are protecting the airway so the person can breathe, checking and correcting blood sugar levels, warming the body if temperature has dropped, and monitoring heart rhythm.
If someone is unable to breathe adequately on their own, they may be placed on a breathing tube. Fluids are given through an IV to prevent dehydration and support blood pressure. Blood sugar is tested early because hypoglycemia is common and easily treated but dangerous if missed. In most cases, the person stays under observation until their BAC drops to a safe level, they can breathe independently, and their vital signs are stable. The length of that stay varies from several hours to more than a day depending on how severe the poisoning was.
Why Some People Are More Vulnerable
Body size is the most obvious factor. A smaller person reaches a dangerous BAC faster with fewer drinks. But biology matters in less obvious ways too. People with lower levels of the enzymes that break down alcohol, which is more common in certain East Asian populations, process alcohol more slowly and reach higher blood levels from the same amount. Drinking on an empty stomach accelerates absorption dramatically. Medications that affect the liver or central nervous system, including common ones like antihistamines and some antidepressants, can amplify alcohol’s depressant effects.
Binge drinking is the most common path to alcohol poisoning. Consuming a large amount in a short window, typically defined as four or more drinks within two hours for women and five or more for men, overwhelms the liver’s ability to metabolize alcohol. The liver processes roughly one standard drink per hour. Everything beyond that accumulates in the bloodstream, and the gap between “very drunk” and “in danger” can be surprisingly small.