Alcohol poisoning happens when you drink enough alcohol to shut down critical functions in your brain, particularly the areas that control breathing, heart rate, and body temperature. At a blood alcohol concentration (BAC) of 0.30% to 0.40%, most people lose consciousness, and above 0.40%, the risk of coma and death from respiratory arrest becomes very real. This isn’t just being “really drunk.” It’s a medical emergency where your body starts failing in specific, dangerous ways.
How Alcohol Shuts Down Your Brain
Alcohol works on the brain in two ways simultaneously. It boosts the activity of your brain’s main “slow down” chemical while blocking its main “speed up” chemical. The combined result is a powerful dampening of brain activity. At low doses, this is what makes you feel relaxed or uninhibited. At high doses, the suppression goes far deeper than mood or coordination.
The danger zone begins when alcohol reaches the brainstem, the part that runs your body on autopilot. This region keeps you breathing without thinking about it, maintains your heart rhythm, and controls reflexes like gagging when something enters your airway. When alcohol suppresses those functions, your body loses the ability to protect itself. At a BAC above 0.31%, breathing can slow to a life-threatening degree. Fewer than eight breaths per minute, or gaps of more than ten seconds between breaths, are hallmarks of alcohol poisoning.
What It Looks Like as It Happens
Alcohol poisoning doesn’t always look the way people expect. Someone may not be dramatically thrashing around or screaming for help. More often, the person is unconscious or barely responsive, and the signs are quiet but severe:
- Extremely slow or irregular breathing: Fewer than eight breaths per minute, or long pauses between breaths.
- Low body temperature: The skin may feel cold and clammy, and may turn bluish or very pale.
- No gag reflex: If the person vomits while unconscious, they may not be able to clear their airway.
- Unresponsiveness: The person can’t be woken up or responds only with groaning, with no awareness of their surroundings.
These signs can appear even after someone has stopped drinking. Alcohol continues to be absorbed from the stomach and intestines into the bloodstream for some time after the last drink, so a person’s condition can worsen quickly even when the bottle is already down.
The Biggest Immediate Dangers
Choking on Vomit
This is one of the most common ways alcohol poisoning kills. Normally, your gag reflex kicks in automatically if something other than air enters your windpipe. Alcohol at poisoning-level concentrations suppresses that reflex. If someone passes out and vomits, the stomach contents can slide into the airway with nothing to stop them. This blocks airflow, and death from suffocation can happen in minutes. It’s the reason you should never leave someone who’s passed out from drinking lying on their back. Rolling them onto their side can keep the airway clear.
Breathing Failure
Even without choking, the brainstem suppression can slow breathing enough that the body doesn’t get adequate oxygen. When the brain is deprived of oxygen for more than a few minutes, permanent damage begins. Prolonged oxygen deprivation can lead to lasting neurological problems or death, even if the person eventually receives medical care.
Dangerously Low Body Temperature
Alcohol causes blood vessels near the skin to widen, which creates a feeling of warmth but actually accelerates heat loss. In a poisoning scenario, body temperature can drop so low that it triggers cardiac arrest. This risk is especially high if someone passes out in a cold environment.
Blood Sugar Crashes
The liver is responsible for maintaining your blood sugar between meals by producing glucose on its own. Alcohol directly interferes with this process. During a poisoning episode, blood sugar can fall to dangerously low levels, which compounds the brain’s distress and can cause seizures. This can happen even in people with no history of blood sugar problems.
What Happens at the Hospital
There is no antidote for alcohol. The body has to process it out on its own. What emergency medicine does is keep you alive while that happens, and prevent the complications described above from becoming fatal.
The first priority is the airway. If breathing is severely compromised, a tube may be placed into the windpipe to ensure air keeps flowing to the lungs. Supplemental oxygen is commonly given through a tube clipped to the nose. Intravenous fluids address dehydration and can help bring blood sugar levels back up. Body temperature is monitored and managed. Throughout all of this, the medical team watches for seizures, aspiration (stomach contents in the lungs), and heart rhythm problems.
How long someone stays in the hospital depends on the severity. Mild cases where the person is monitored and gradually sobers up may resolve in several hours. More severe episodes, particularly those involving breathing support or complications, can require a longer stay. Recovery doesn’t end at discharge: headaches, nausea, confusion, and fatigue commonly persist for a day or more afterward. In cases where oxygen deprivation occurred, some neurological effects can be long-lasting.
How Much Alcohol It Takes
There’s no single number of drinks that causes alcohol poisoning in everyone. BAC depends on how much you drink, how fast you drink it, your body weight, whether you’ve eaten, and individual differences in how your liver processes alcohol. But the numbers paint a clear picture of risk: a BAC of 0.30% to 0.40% is the range where poisoning and loss of consciousness typically occur, and anything above 0.40% carries a serious risk of death.
Binge drinking, especially drinking large amounts in a short window, is the most common path to alcohol poisoning because it floods the bloodstream faster than the liver can keep up. The liver metabolizes roughly one standard drink per hour. Consuming five, ten, or more drinks in a couple of hours can push BAC into dangerous territory before the person even realizes how impaired they are.
The Scale of the Problem
Alcohol poisoning is not rare. Deaths from excessive alcohol use in the United States averaged about 178,000 per year during 2020 and 2021, a 29% increase from the roughly 138,000 annual average just a few years earlier. Among adults aged 20 to 64, an estimated one in eight deaths is attributable to excessive alcohol use. These figures include not just acute poisoning but the full spectrum of alcohol-related death, yet they underscore how significant the toll is. Acute overdose is one of the most immediately preventable causes of death in that broader count.