You cannot speed up how fast someone gets sober. The liver processes alcohol at a fixed rate of about 0.015 to 0.020 percent blood alcohol concentration (BAC) per hour, which means someone at the legal limit of 0.08 BAC needs roughly four to five hours to reach zero. No food, no drink, no trick changes that clock. What you can do is keep the person safe while their body does the work, and recognize when the situation has become an emergency.
Why Nothing Actually Speeds Up Sobriety
About 90% of alcohol is processed exclusively by the liver. Only a tiny fraction leaves the body through sweat, breath, and urine. That’s why every popular “sober up” method fails at the one thing people want it to do: lower the amount of alcohol in the blood.
Coffee and caffeine do not alter alcohol metabolism at all. What caffeine does is reduce alcohol’s sedative effects, making someone feel more alert while still just as impaired. Researchers describe this as being “wide-awake drunk,” which can actually be more dangerous because the person may overestimate their ability to drive or make decisions. Cold showers, fresh air, and exercise don’t change BAC either. They may make someone feel temporarily more alert, but coordination, reaction time, and judgment remain compromised until the liver catches up.
Water doesn’t lower BAC. It does help with dehydration, which is responsible for many hangover symptoms, so it’s worth offering. But drinking a glass of water won’t make someone sober enough to drive home.
What Food Can and Can’t Do
Eating before or during drinking is well known to slow alcohol absorption. But what about eating after someone is already drunk? Research from Johns Hopkins University found that consuming food while drinking increases the rate of alcohol elimination from the bloodstream by 25 to 45%. That’s a meaningful boost, but it doesn’t translate to instant sobriety. If someone’s BAC is high, even a 45% faster elimination rate still means hours of waiting. A meal with protein, fat, and carbohydrates is worth offering because it supports the body’s processing and can settle the stomach, but it won’t make someone safe to drive in 30 minutes.
How to Keep Someone Safe While They Sober Up
Since time is the only real factor, your job is to keep the intoxicated person comfortable and monitored until their body clears the alcohol. Here’s what that looks like in practice:
- Stay with them. Don’t leave a heavily intoxicated person alone, especially if they’re close to falling asleep. Wake them frequently to confirm they’re responsive and not slipping into unconsciousness.
- Offer water in small sips. This helps with dehydration but also gives you a way to gauge how alert and coordinated they are.
- Offer bland food. Bread, crackers, or a simple meal can support alcohol elimination and reduce nausea.
- Keep them warm. Alcohol dilates blood vessels near the skin, which causes heat loss. A blanket helps prevent their body temperature from dropping too low.
- Don’t let them “sleep it off” unsupervised. BAC can continue rising for up to an hour after the last drink, meaning someone can seem okay and then get worse.
The Recovery Position
If the person needs to lie down, place them on their side rather than their back. This is called the recovery position, and it prevents choking if they vomit. Choking on vomit while unconscious is one of the leading causes of alcohol-related deaths.
To do it: with the person on their back, extend the arm nearest you out at a right angle, palm facing up. Take their other arm and fold it so the back of their hand rests on the cheek closest to you. Bend the knee farthest from you to a right angle, then use that bent knee as a handle to gently roll them toward you onto their side. Their head should rest on the folded hand, and the bent leg keeps them from rolling onto their face. Tilt their head back slightly to open the airway, and check that nothing is blocking their mouth.
When It Becomes an Emergency
There’s a critical line between “very drunk” and alcohol poisoning, and it can be hard to see in the moment. The National Institute on Alcohol Abuse and Alcoholism identifies these warning signs that require a 911 call immediately:
- Breathing problems: fewer than 8 breaths per minute, or gaps of 10 seconds or more between breaths
- Can’t be woken up: if you shake them, shout their name, or pinch their skin and they don’t respond, they are not “sleeping it off”
- Repeated or uncontrollable vomiting, especially while semiconscious
- Seizures
- Skin changes: cold, clammy, pale, or bluish skin, particularly around the lips or fingertips
- No gag reflex: this is what prevents choking, and without it, vomiting can be fatal
Alcohol poisoning is a medical emergency. BAC can still be rising even after the person has stopped drinking, so symptoms can appear or worsen suddenly. Don’t wait to see if they “get better.” If you see any of these signs, call for help. A person who is unconscious and cannot be woken has altered brain function that could stop their breathing.
Realistic Timelines
Understanding how long sobriety actually takes can help you plan. At the average elimination rate of 0.015 BAC per hour, here’s roughly what to expect:
- BAC of 0.08 (legal limit): 4 to 5 hours to reach zero
- BAC of 0.12 (noticeably drunk): 6 to 8 hours
- BAC of 0.20 (heavily intoxicated): 10 to 13 hours
These are averages. Body weight, sex, liver health, medications, and how much someone has eaten all shift the timeline. But the core math doesn’t change much. Someone who was drinking heavily until midnight is likely not fully sober by the time they wake up the next morning. This is why “morning after” impaired driving is more common than most people realize.
The honest answer to “how do I sober someone up” is that you can’t, not faster than their body already will. What you can do is keep them hydrated, fed, warm, on their side, and watched closely until their liver finishes the job.