There is no way to make someone sober up faster. The liver breaks down alcohol at a fixed rate of about 0.015 BAC per hour, and nothing you do, not coffee, not cold water, not food, will speed that up. If someone is at a BAC of 0.08 (the legal driving limit in most states), it will take roughly 4 to 5 hours to reach zero. The only thing that actually works is time.
That said, there’s a lot you can do to keep someone safe and comfortable while they wait it out, and there are warning signs that mean the situation has become a medical emergency.
Why Nothing Speeds Up Alcohol Processing
Your liver uses a specific enzyme to break alcohol down, and it works at essentially the same pace no matter what. That pace is about 0.015 BAC per hour. Think of it like a bottleneck: the liver can only handle so much at a time, and flooding it with coffee, water, or food won’t widen the opening.
For a rough sense of timeline: someone who had enough drinks to reach a BAC of 0.08 needs about 5 hours to fully clear it. Someone at 0.15, which is nearly twice the legal limit and firmly in the “visibly drunk” range, is looking at 10 hours. These numbers shift slightly based on body weight, sex, and how much muscle versus fat a person carries. Women generally absorb more alcohol and take longer to process it than men of the same weight, partly because of differences in body composition and water content.
Coffee, Cold Showers, and Other Myths
Coffee is the most persistent myth. The CDC is clear on this: caffeine does not reduce the effects of alcohol on the body. What it can do is make a drunk person feel more awake and alert, which is actually dangerous. They may believe they’re less impaired than they are, leading them to drive, drink more, or take risks they otherwise wouldn’t. A caffeinated drunk person is still a drunk person.
Cold showers work on a similar principle. The shock of cold water triggers an adrenaline response that can make someone feel more alert for a few minutes, but their BAC hasn’t budged. There’s also a real safety risk: a heavily intoxicated person in a shower can slip, fall, or lose consciousness in the water.
Even medical-grade hydration doesn’t help much. A study published in the Italian Journal of Emergency Medicine looked at whether IV fluids given to intoxicated patients in the emergency department helped them sober up faster. The results showed no significant difference in intoxication levels or discharge times between patients who received fluids and those who didn’t. The researchers concluded there is no evidence that fluid administration makes patients sober faster.
What You Can Actually Do
Since you can’t speed up the clock, your job is to make the wait safer and more comfortable.
- Stop the drinking. This is the single most useful thing you can do. Every additional drink adds roughly another hour (or more) to the timeline. Switch to water or a non-alcoholic drink, and if they resist, be direct about why.
- Offer water and food. Neither will lower their BAC, but water helps prevent dehydration (alcohol is a diuretic), and food can slow the absorption of any alcohol still sitting in the stomach. A meal won’t undo drinks already absorbed, but if they’re still actively drinking, food in the stomach means the next drink hits more slowly.
- Keep them warm. Alcohol dilates blood vessels near the skin, which makes people lose body heat faster than they realize. A blanket or jacket matters more than you’d think, especially outdoors.
- Stay with them. Intoxicated people make poor decisions about their own safety. Don’t leave them alone, and definitely don’t let them drive.
If They Need to Sleep It Off
Letting someone “sleep it off” is reasonable in many cases, but how you position them matters. A person who is very drunk can vomit while unconscious and choke on it. This is one of the most common causes of alcohol-related death that isn’t an accident or long-term disease.
Place them in the recovery position: lay them on their side with their bottom arm extended straight out (palm up) to stabilize them. Take their top arm and fold it so the back of that hand rests against the cheek closest to the ground. Bend their top knee at a right angle and use it as a lever to gently roll them onto their side. This position keeps the airway open and lets any vomit drain out rather than pool in the throat. Tilt their head back slightly and lift their chin to make sure the airway stays clear.
Check on them regularly. If their breathing changes, their skin gets cold and clammy, or you can’t wake them up, the situation has escalated.
Signs This Is a Medical Emergency
There’s a line between “drunk and needs to sleep” and alcohol poisoning, and it’s important to know where it is. Call emergency services if you see any of the following:
- Slow breathing: fewer than 8 breaths per minute
- Irregular breathing: gaps of 10 seconds or more between breaths
- Bluish or very pale skin
- Extremely low body temperature or clammy skin
- Unconsciousness with no response to shouting or shaking
- Seizures
Alcohol poisoning can kill, and the person’s BAC can continue rising even after they stop drinking, because alcohol in the stomach is still being absorbed. Don’t assume someone is “fine” just because they stopped drinking 20 minutes ago. If you’re unsure whether the situation is serious, err on the side of calling for help. No one has ever regretted an unnecessary call to emergency services in a situation like this.