You cannot speed up how fast someone’s body processes alcohol. The liver breaks down roughly one standard drink per hour, and nothing you do will change that rate. No food, no coffee, no cold water. What you can do is keep the person safe and comfortable while their body does the work, and recognize when the situation has become a medical emergency.
Why You Can’t Speed Up Sobering
Alcohol is processed almost entirely by the liver using a two-step enzyme system. The first enzyme converts alcohol into a toxic compound called acetaldehyde. The second enzyme converts that into acetate, which the body then breaks down into water and carbon dioxide. This process runs at a fixed pace of about 7 grams of alcohol per hour for an average-sized adult, which works out to approximately one standard drink per hour.
That means someone who has had six drinks will need roughly six hours to fully clear the alcohol from their system. There is no supplement, trick, or home remedy that meaningfully accelerates this enzyme activity. The rate is set by the amount of enzyme your liver produces and the availability of a specific chemical cofactor it needs to function. Drinking water, eating food, or exercising won’t change the speed of this bottleneck.
What Actually Helps
While you can’t make someone sober faster, you can help them feel better and stay safe during the wait.
- Water and electrolytes. Alcohol is a diuretic, meaning it pulls water from the body. Dehydration contributes to headaches, nausea, and dizziness. Having the person sip water or an electrolyte drink won’t lower their blood alcohol level, but it addresses the dehydration that makes intoxication feel worse.
- A light snack. Eating food after someone has already been drinking won’t reverse alcohol absorption the way eating before drinking can. However, food eaten after drinking may slightly increase the rate of alcohol elimination and can help settle the stomach. Plain carbohydrates like toast or crackers are a good choice.
- Rest. Sleep gives the body uninterrupted time to metabolize alcohol. A person who falls asleep intoxicated and sleeps for several hours will wake up measurably more sober simply because time has passed.
- Fresh air and a comfortable space. A cool, quiet room with access to a trash can or bathroom helps the person rest without added stimulation that could trigger nausea.
Myths That Can Be Dangerous
Coffee and Energy Drinks
Caffeine does not reduce alcohol’s effects on the body. It can make an intoxicated person feel more alert and energetic, which creates a dangerous illusion of sobriety. The CDC warns that this false sense of alertness may lead someone to drink more or to attempt activities like driving when they are still significantly impaired. A person who drinks coffee after heavy drinking is still just as intoxicated. They’re just more awake.
Cold Showers
A cold shower will not sober anyone up. The shock of cold water on an intoxicated person can cause them to lose consciousness, which creates a serious drowning or injury risk. Alcohol already lowers core body temperature, and a cold shower can accelerate that drop toward hypothermia. Never put a heavily intoxicated person in a cold shower.
Making Them Vomit
Inducing vomiting in someone who is very drunk is dangerous. Their gag reflex may be suppressed, meaning vomit can enter the airway and cause choking or aspiration. If the person vomits on their own, help them lean forward and keep their airway clear, but never force it.
If Someone Passes Out
An intoxicated person who is unconscious or cannot be woken up needs immediate medical attention. Call emergency services right away. While waiting, place the person in the recovery position: lying on their left side, with their right knee bent forward to prevent them from rolling onto their stomach, and their head resting on their right hand to keep the airway open. This position helps prevent choking if they vomit while unconscious.
Do not leave them on their back. Do not leave them alone.
Signs of Alcohol Poisoning
There’s a critical difference between someone who is very drunk and someone who is experiencing alcohol poisoning. Call 911 if you see any of the following, even just one:
- Slow breathing: fewer than eight breaths per minute
- Irregular breathing: gaps of 10 seconds or more between breaths
- Skin that looks blue, gray, or unusually pale
- Low body temperature (skin feels cold and clammy)
- Inability to stay conscious or be woken up
Alcohol poisoning can cause body temperature to drop low enough to trigger cardiac arrest. You do not need to see all of these signs before calling for help. One is enough.
Be Careful With Pain Relievers
It’s tempting to offer someone a painkiller to ease the headache that comes with heavy drinking, but this decision matters more than most people realize. Acetaminophen (Tylenol) is processed by the liver, and combining it with alcohol increases the production of a toxic byproduct that can damage liver cells. This risk is especially high in people who drink regularly.
NSAIDs like ibuprofen (Advil) and aspirin already raise the risk of gastrointestinal bleeding on their own. Alcohol significantly amplifies that risk. If the person needs pain relief, waiting until the alcohol has cleared their system is the safer choice.
Realistic Recovery Timelines
Since the liver clears about one drink per hour, you can roughly estimate when someone will be sober based on how much they consumed. Someone who had four drinks over two hours still has about two hours of processing left after their last drink. Someone who had eight drinks at a party ending at midnight likely won’t be fully clear of alcohol until at least 6 or 7 a.m., possibly later depending on body weight, sex, and liver health.
These are averages. Women generally metabolize alcohol more slowly than men. People with liver damage process it slower still. The only truly reliable way to know if alcohol has left someone’s system is time. There are no shortcuts, only patience and keeping the person safe while the clock runs.
Long-Term Nutrient Concerns
For someone who drinks heavily on a regular basis, the effects go beyond a single night. Chronic alcohol use depletes thiamine (vitamin B1), a nutrient the brain needs to function properly. Alcohol interferes with thiamine at multiple levels: people who drink heavily tend to eat poorly, alcohol reduces the gut’s ability to absorb thiamine, and it impairs cells’ ability to use whatever thiamine they do take in. Chronic alcohol use also depletes magnesium, which compounds the problem because magnesium is needed for thiamine-dependent enzymes to work.
Restoring thiamine through diet or supplementation, combined with reducing alcohol intake, has been shown to reverse some of the cognitive effects of deficiency, including improvements in working memory. For anyone helping a person who drinks frequently, encouraging better nutrition during sober periods is one of the most meaningful things you can do.