Stages of Being Drunk: From Buzzed to Wasted (BAC & Symptoms)

Most patients who end up in serious trouble from alcohol did not set out to get dangerously drunk. They describe the same pattern: the first two drinks felt social and controlled, then somewhere between the third and fifth drink the evening took on a life of its own. What I find clinically striking is how often people can accurately describe what “wasted” looks like in someone else, but cannot identify when they themselves crossed that line. That is not a character flaw. That is pharmacology.

What BAC Actually Means and Why It Matters

Blood alcohol concentration is the percentage of alcohol in your bloodstream by volume. A BAC of 0.08% means 0.08 grams of alcohol per 100 millilitres of blood. That number drives everything in this article, because BAC predicts cognitive and physical impairment far more reliably than the number of drinks you have had.

Your liver metabolises roughly one standard drink per hour using an enzyme called alcohol dehydrogenase (ADH). That is the baseline. But ADH capacity varies considerably by body weight, sex, genetics, food intake, and whether your liver is already dealing with other substances. Women, on average, reach higher BAC from the same amount of alcohol as men, because of lower body water percentage and differences in first-pass metabolism in the stomach.

The result is that “three beers” is not a reliable unit of measurement. A 55 kg woman drinking three 5% beers over 90 minutes will be in a very different place neurologically than a 90 kg man doing the same.

The Six Stages of Being Drunk

Stage 1 — Subclinical (BAC 0.01%–0.05%)

This is the stage most people do not notice, or mistake for feeling normal. At BAC 0.01% to 0.05%, your brain is already affected. The prefrontal cortex, the part responsible for risk assessment and decision-making, begins to lose its edge. You feel slightly more relaxed. Social inhibitions drop a little. Reaction time slows by roughly 10%.

You feel fine. That is exactly the problem.

Stage 2 — Euphoria / The Buzz (BAC 0.03%–0.12%)

This is what most people call being “buzzed” or starting to feel tipsy. Dopamine release in the nucleus accumbens increases, which is the same reward pathway involved in every addictive substance. You feel warm, talkative, confident. Minor coordination issues begin. Your pain threshold rises slightly because alcohol is acting on GABA-A receptors, which are the brain’s primary inhibitory receptors, producing a sedative effect.

At the upper end of this range, 0.10% to 0.12%, you are legally impaired for driving in most countries. Reaction time is 20 to 30% slower. Memory encoding is already compromised, meaning events from this point forward may not form reliable long-term memories.

Stage 3 — Excitement / Tipsy (BAC 0.09%–0.25%)

Here is where the gap between how you feel and how you actually are becomes dangerous. Emotional dysregulation kicks in. A minor frustration can become an outburst. Sadness can become tears. Confidence tips into aggression. Blurred vision and slurred speech are common at this range. Balance is measurably impaired.

The competitor content describes this stage as “excitement,” which is accurate but undersells what is happening neurologically. Glutamate, your brain’s main excitatory neurotransmitter, is being suppressed by alcohol at NMDA receptors. GABA-A inhibition is increasing. Cerebellum function, which governs coordination and balance, is declining. This is not just feeling loose. This is your cerebellum being chemically disrupted.

Blackouts can begin in this range for some people. A blackout is not passing out. It is your hippocampus failing to encode new memories while you remain awake, mobile, and apparently conscious.

Stage 4 — Confusion / Wasted (BAC 0.18%–0.30%)

At this stage, most people around you can see something is badly wrong even if you cannot. Total disorientation. Severe motor impairment. Many people at this BAC cannot stand without support. Pain perception is so dulled that injuries happen without the person realising. Vomiting is common and, at this stage, dangerous, because your gag reflex is impaired enough that aspiration is a real risk.

The pattern I see in clinic is that people in this range often still believe they are “just a bit drunk.” They are not. They are medically impaired and at escalating risk of alcohol poisoning.

Stage 5 — Stupor (BAC 0.25%–0.40%)

The person is largely unresponsive to verbal communication. Breathing slows. Skin may be pale or bluish. Reflexes are severely diminished. Bladder control fails. The medulla oblongata, which controls breathing and heart rate automatically, is now being suppressed. This is the boundary of acute medical emergency.

At this range, hospital intervention is required. This is not a “sleep it off” situation.

Stage 6 — Coma and Fatal Alcohol Poisoning (BAC 0.40%+)

Above 0.40% BAC, the risk of respiratory failure and cardiac arrest rises sharply. The LD50 for alcohol (the dose at which 50% of people die) is estimated around 0.45% to 0.50% BAC, though individual variation means some people die at lower concentrations, particularly if other CNS depressants such as benzodiazepines or opioids are present.

BAC by Stage — Quick Reference

What Affects How Drunk You Get

BAC is not just about how much you drink. Several biological factors shift where you land on this scale.

Body weight and composition matter because alcohol distributes into body water, not fat. Two people of the same weight but different body fat percentages will have meaningfully different BACs from the same drinks. Sex differences in first-pass metabolism mean women absorb proportionally more alcohol per drink into the bloodstream. The enzyme alcohol dehydrogenase is less active in the gastric lining of women on average, so less alcohol is broken down before it reaches the blood.

Genetics play a significant role. The ALDH22 variant, common in East Asian populations, reduces the efficiency of aldehyde dehydrogenase 2 (ALDH2), the enzyme that clears acetaldehyde (the toxic breakdown product of alcohol). People with this variant flush, feel nauseous, and experience heart palpitations at low BAC because acetaldehyde accumulates. This is protective in one sense but also means these individuals are at higher risk of oesophageal cancer from acetaldehyde exposure over time.

Food in your stomach slows gastric emptying and delays alcohol absorption, flattening the BAC curve. Drinking on an empty stomach can accelerate absorption by 50% compared to drinking after a full meal.

Alcohol Blackouts — What Is Actually Happening

A blackout is one of the most misunderstood phenomena in alcohol intoxication. It is not unconsciousness. It is anterograde amnesia, meaning your brain stops forming new memories while you remain conscious and moving.

This happens because alcohol suppresses long-term potentiation in the hippocampus via NMDA receptor blockade. The hippocampus cannot consolidate short-term experience into long-term memory, so events just do not get stored. The person may appear to be having a normal conversation, making decisions, and navigating their environment. They will remember none of it.

Fragmentary blackouts (often called “brownouts”) involve partial memory loss. En bloc blackouts mean complete amnesia for the period. En bloc blackouts typically begin around BAC 0.20% but can occur earlier in people with alcohol use disorder, because repeated alcohol exposure sensitises the hippocampus to this effect.

If you find it useful to understand what others observe during these moments, the article on how to tell if someone is drunk covers observable signs from an external perspective.

How to Tell What Stage You or Someone Else Is At

The difficulty is that self-assessment degrades with intoxication. By Stage 3, the very brain regions responsible for judging impairment are impaired. This is why “I feel fine to drive” is so dangerous at 0.12% BAC.

External indicators are more reliable. Speech clarity is a useful early marker. Coordination, tested simply by watching someone walk a straight line or pick up a small object, shows impairment before the person feels impaired. Eye signs, including nystagmus (involuntary horizontal eye movements) and pupil response, are what police field sobriety tests are based on. You can read more about the physiology behind what drunk eyes look like and why they signal CNS depression.

The CAGE questionnaire and AUDIT-C score are clinical screening tools used to assess whether someone’s overall drinking pattern is problematic, not to grade a single episode. For acute intoxication, BAC is still the gold standard.

Factors That Make Each Stage More Dangerous

Mixing alcohol with other CNS depressants is where single-episode intoxication becomes acutely life-threatening. Benzodiazepines (Valium, Xanax), opioids (codeine, oxycodone, tramadol), and certain antihistamines all potentiate GABA-A activation and compound the suppression of breathing that alcohol causes at higher BAC. Someone at Stage 3 BAC on alcohol alone is in a different situation from someone at Stage 3 BAC with diazepam on board. The latter can reach respiratory depression far more quickly.

Stimulants such as cocaine or MDMA create a different but equally serious problem. They mask the sedative effects of alcohol, allowing people to drink far past their usual threshold without feeling as impaired. BAC continues to rise while the person feels artificially alert. The comedown then hits hard.

Dehydration and heat accelerate intoxication. In a hot climate, alcohol’s diuretic effect (via suppression of antidiuretic hormone, or ADH, a different ADH from the metabolic enzyme) combined with heat-related fluid loss can push someone into higher-stage symptoms faster than they would expect.

How Long Each Stage Lasts — Sobering Up Timeline

Your liver processes roughly 0.015% BAC per hour, regardless of what you eat, drink, or do. There is no shortcut to this. Coffee makes you a more alert drunk. Cold water makes you a colder drunk. Sleep slows metabolism slightly. None of these reduce your BAC or your impairment level.

If you find that you regularly reach Stages 3 or 4, that blackouts are a pattern rather than a rare event, or that you are drinking to a level that worries you the next morning, that pattern meets the clinical threshold for alcohol use disorder (AUD) as defined by the DSM-5. AUD is not about moral failure. It is a neurological condition characterised by the loss of the ability to reliably control consumption, driven by changes in the dopamine reward system, the stress response, and prefrontal cortical control circuits.

At Phuket Island Rehab, we work with people at every point on that spectrum, from early-stage concern to severe dependence requiring medically supervised detox. The team includes clinicians experienced in both the medical management of withdrawal and the longer-term psychological treatment of alcohol use disorder. If the drinking pattern described in this article feels familiar rather than theoretical, that is worth acting on.

Alcohol intoxication moves through six distinct stages, from subclinical impairment at BAC 0.01% through to fatal alcohol poisoning above 0.40%. The critical clinical reality is that the brain’s capacity to assess its own impairment degrades in parallel with the impairment itself. By Stage 3 (what most people call “drunk” or “wasted”), the prefrontal cortex is already compromised, blackouts are possible via hippocampal NMDA receptor blockade, and the gap between how you feel and how you actually are is wide enough to be fatal. Individual factors including sex, genetics (particularly ALDH2 variants), body composition, food intake, and co-ingested substances all shift where you land on the BAC curve, meaning there is no reliable formula based on drink count alone. Mixing alcohol with benzodiazepines or opioids at any stage is genuinely life-threatening.

The practical takeaways are these. One standard drink takes roughly one hour to clear your liver. There is no method of speeding that up. Blackouts are not just a bad night, they are a neurological warning sign with long-term implications for hippocampal health. External observation of someone’s coordination, speech, and eye movements is more reliable than asking them how they feel. And if reaching Stage 4 has become a regular occurrence, that pattern warrants clinical attention, not just a resolution to be more careful next time. As John A. Smith of Phuket Island Rehab puts it: “The patients who concern me most are not the ones who got dangerously drunk once. They are the ones who have done it enough times that it feels normal, and have adjusted their definition of ‘fine’ downward to match.”

What are the stages of being drunk in order?

The six stages of being drunk in order are subclinical (BAC 0.01%–0.05%), euphoria or buzzed (0.03%–0.12%), excitement or tipsy (0.09%–0.25%), confusion or wasted (0.18%–0.30%), stupor (0.25%–0.40%), and coma or fatal alcohol poisoning (0.40%+). Each stage brings progressive suppression of the central nervous system, starting with the prefrontal cortex and, at the highest stages, reaching the medulla oblongata which controls breathing and heart rate. The overlap between stages reflects the fact that individual metabolism and genetic factors shift exactly where each person lands at a given BAC.

What does being tipsy feel like compared to being drunk?

Being tipsy, roughly BAC 0.07%–0.12%, feels like warmth, mild confidence, and relaxed social ease, with early coordination effects that are noticeable if you pay attention. Being drunk, at BAC 0.15% and above, involves emotional dysregulation, slurred speech, measurably impaired balance, and a significant reduction in your ability to judge your own state. The key clinical difference is that a tipsy person can still partially access their prefrontal cortex and apply some self-regulation, while someone who is drunk has lost reliable access to that executive function. Most people underestimate how far past “tipsy” they actually are.

What is a blackout and at what BAC does it happen?

A blackout is anterograde amnesia caused by alcohol blocking long-term potentiation in the hippocampus via NMDA receptor suppression, meaning new memories stop forming while the person remains conscious and active. Fragmentary blackouts (partial memory loss) can begin around BAC 0.15% in some individuals, while complete en bloc blackouts typically occur above BAC 0.20%. People with a history of heavy drinking can experience blackouts at lower BAC thresholds because repeated alcohol exposure sensitises the hippocampus to this effect. Frequent blackouts are a clinically significant warning sign for alcohol use disorder.

How long does it take to sober up from each stage of drunkenness?

Your liver clears approximately 0.015% BAC per hour regardless of what you eat or drink, so the math is fairly straightforward. Someone at 0.08% takes roughly 5 to 6 hours to reach 0.00%, while someone at 0.25% takes around 16 to 17 hours. Coffee, water, food, and sleep do not accelerate this process. The most common clinical error is assuming that sleeping off a heavy night means you are safe to drive in the morning, when in fact BAC may still be above the legal limit several hours after waking.

What are the signs of alcohol poisoning and what should you do?

Signs of alcohol poisoning include unconsciousness or inability to be woken, fewer than 8 breaths per minute or irregular breathing, blue or pale skin, seizures, and cold clammy skin. Call emergency services immediately. Do not try to make the person walk it off, give them coffee, or put them under a cold shower, none of these reduce BAC and all of them waste critical time. If the person is unconscious but breathing, place them in the recovery position on their side to reduce the risk of aspiration, and stay with them until medical help arrives.

Does being drunk feel the same for everyone?

No, and the differences are clinically meaningful. Women typically reach higher BAC from the same drink volume due to lower body water and reduced first-pass gastric metabolism. People with the ALDH22 genetic variant, common in East Asian populations, experience a toxic acetaldehyde buildup at low BAC producing flushing, nausea, and rapid heart rate. Body weight, food intake, liver health, and medications all shift the curve. This is why counting drinks is an unreliable guide to impairment and why some people can appear functional at BAC levels that would incapacitate others. For a broader look at how alcohol dependence develops over time, the stages of alcoholism article explains the longer-term trajectory.

Is it dangerous to sleep after drinking heavily?

Sleep after Stage 4 or Stage 5 intoxication carries real risk. Vomiting during sleep can lead to aspiration, particularly when the gag reflex is suppressed at higher BAC levels. BAC can also continue to rise for 30 to 90 minutes after the last drink, as alcohol still in the stomach is absorbed, meaning someone who seemed stable when they went to bed may reach a higher peak BAC while unconscious. Anyone who has consumed a large amount of alcohol in a short period should be monitored rather than left alone to sleep, and should be placed in the recovery position if there is any concern.