How Long Does Alcohol Stay in Your System?

Alcohol affects everyone a little differently. Some people get drunk easily, while others have a high tolerance that makes it difficult to feel its effects. A few factors impact intoxication levels and how long alcohol can actually stay in your system.

Here’s how your body metabolizes alcohol, how long tests can detect it, and what happens in your body when you drink.

How Alcohol Affects the Body

Alcohol is a depressant, meaning it slows down the central nervous system. That’s why drinking makes you feel calm, euphoric, or even drowsy. By slowing your nervous system, alcohol also reduces your motor coordination, reaction time, and ability to think clearly.

Here are some of the ways alcohol affects your body in the short term:¹

• Brain: Alcohol makes it hard to focus or make decisions. When you’re intoxicated, you have lower inhibitions and are more likely to act impulsively. And with heavy drinking, you might become dizzy, lose consciousness, or have gaps in your memory the next day (often called a blackout).
• Mood: Drinking can change your mood, making you feel relaxed, excited, angry, or depressed. It can also increase your sexual desire.
• Physical ability: Drinking can change your hearing, vision, and depth perception. It can make it harder to walk or stay coordinated. Your speech may slur, and your reaction time slows.
• Organ function: Alcohol is taxing on your liver and digestive tract. Because it affects the nervous system, heavy drinking can cause slowed breathing. You might feel nauseous after drinking, or vomit or have diarrhea.

While the short-term effects of drinking may not last very long, that doesn’t mean they’re insignificant. Impulsive behavior, slowed reaction time, and changes in your mood can impact your life in ways that have far-reaching effects, from accidents and injuries to poor decision-making.

How Alcohol is Measured Inside Your Body

The level of alcohol in your body is measured by blood alcohol concentration (BAC).² This number, also called blood alcohol content, measures how much alcohol is present in your bloodstream. It’s expressed as the ratio of grams of alcohol per 100 milliliters of blood.

You can also measure BAC by breath, which counts how many grams are present per 210 liters of breath.

What Affects How Long Alcohol Stays in Your System

Alcohol affects people differently. How intoxicated one person gets and how quickly, as well as how long alcohol stays in their body, depend on a few variables.

• Gender: “After drinking the same amount of alcohol, women tend to have higher blood alcohol levels than men, and the immediate effects of alcohol usually occur more quickly and last longer in women than men,” according to the U.S. Centers for Disease Control and Prevention.³
• Body fat percentage: Because it holds less water than muscle, fat absorbs alcohol from your blood at a lower rate.⁴ This means that for two people who weigh the same, the person with a higher body fat percentage will have a higher BAC after drinking the same amount. Body size also has an effect, with smaller bodies having less blood to dilute alcohol.
• Age: In general, the older you get, the longer alcohol stays in your system.⁶ That’s because your ability to process alcohol worsens over time. According to Harvard Health, older adults have a higher BAC than younger people after drinking the same amount.
• How much you’ve eaten: If there’s food in your stomach, your body will absorb less alcohol. Studies show that “the consumption of foods before or together with alcohol reduces peak blood alcohol concentration, decreases absorption and slows metabolism.⁷ In particular, ‘high-energy’ meals may slow down alcohol metabolism and reduce subjective intoxication.”
• Other drugs present in your system: Some medications affect how your body handles alcohol.⁸ This includes blood pressure medication, antidepressants, muscle relaxants, and anti-inflammatory drugs.

The pattern of your drinking matters as well. Binge drinking, defined as enough drinks to push your BAC to 0.08% in about two hours, floods your system faster than your liver can keep up with, so more alcohol lingers in your bloodstream.

How Long Does It Take to Feel the Effects of Alcohol?

Just like there’s no standard length of time that alcohol stays in your body, the time it takes to feel the effects of alcohol varies from person to person. Typically, you’ll feel the effects of drinking alcohol anywhere within 15-45 minutes, depending on the strength of the drink and how quickly you drink it.⁹

After the first 15-45 minutes, you’ll likely feel the relaxing effects of alcohol. If you continue to drink, especially at a rate faster than one drink per hour, you’ll feel progressively intoxicated. At a BAC of .02%, you might feel relaxed and euphoric.¹⁰ At a BAC of .05%, you may start to experience lowered inhibitions, impaired judgment, and loss of coordination.

How Your Body Metabolizes Alcohol

When you drink, alcohol enters your stomach and moves on to the small intestine. From there, small blood vessels carry it into your bloodstream. Roughly 20% of alcohol absorption happens through the stomach.¹¹ The majority of alcohol is absorbed through the small intestine, though about 10% is eliminated via your breath, sweat, and urine.

Alcohol is broken down mainly in your liver. Using the enzyme alcohol dehydrogenase (ADH), the organ converts the ethanol you drank into acetaldehyde. Acetaldehyde is then broken down into acetate, which is metabolized into water and carbon dioxide. At that point, your body can eliminate these alcohol metabolites easily.

How Long Does It Take the Body to Metabolize Alcohol?

A good rule of thumb is that most healthy people can metabolize about one standard drink per hour.¹² Of course, factors like age, body fat percentage, and gender can greatly impact the rate at which your body processes alcohol.

So when does alcohol leave your system? If you drink more than one standard drink per hour, your liver has too much to process at once. The extra alcohol stays in your bloodstream and body tissues until your liver can catch up. That backlog is what makes you feel drunk.

What is One Standard Drink?

Here’s what one standard drink means, according to the U.S. National Institute on Alcohol Abuse and Alcoholism (NIAAA):¹³

• 12 ounces of normal-strength beer (4-5% alcohol)
• 1.5 ounces of distilled spirits or liquor (40% alcohol)
• 5 ounces of wine (12-13% alcohol)

Can You Sober Up Faster?

No, you can’t speed up alcohol metabolism.¹⁴ Once alcohol is in your bloodstream, it can only be cleared by the enzymes in your liver and through your sweat, breath, and urine. Some things might make you feel more alert, like caffeine, water, or a cold shower, but none of them will help you sober up any faster or remove alcohol from your system. Only time does that.

How Long Can Tests Detect Alcohol in the Body?

Alcohol itself can stay detectable in your body for up to 72 hours. How long depends on the type of test and what it’s looking for. Some tests detect ethanol directly, while others look for the byproducts your body creates as it breaks alcohol down.

The same factors that change how fast you absorb and process a drink also shift these numbers. How much you drank, how quickly, whether you’d eaten, and your own metabolism all move the window. So treat the ranges below as typical estimates, not guarantees for any one person.

• Blood tests can detect alcohol for roughly 6 hours.
• Breath tests can detect alcohol for 12 to 24 hours. A breathalyzer test estimates your BAC from a single breath sample.
• Saliva tests can detect alcohol for 12 to 24 hours.
• Urine tests that measure ethanol can detect alcohol for 12 to 24 hours.
• Hair tests can detect alcohol for up to 90 days. A hair follicle test reflects longer-term drinking patterns rather than a single event.

EtG Testing and Longer Detection Times

Some tests don’t look for alcohol at all. They look for ethyl glucuronide (EtG), a direct byproduct your body makes when it processes alcohol. Because this metabolite lingers after the alcohol itself is gone, an EtG test has a much longer detection window than a standard urine test.

After a few drinks, it can show up in urine for up to 48 hours, and sometimes 72 hours or longer after heavier drinking, according to the Medical University of South Carolina.¹⁵ These tests are often used in treatment programs, court-ordered monitoring, and other settings where recent abstinence needs to be confirmed.

There’s two limits to this test. First, the amount detected doesn’t reliably tell anyone how much you drank or whether you were impaired. It only confirms that alcohol was in your body within the detection window. Second, everyday products that contain alcohol, such as some mouthwashes, hand sanitizers, and cosmetics, can occasionally trigger a positive result, which is why labs use cutoff thresholds.

How Alcohol Affects the Liver Over Time

Your liver does most of the work of clearing alcohol, and repeated heavy drinking wears it down. Over months and years, that strain can lead to alcohol-related liver disease, which develops in stages and can range from a fatty liver to permanent scarring.

Generally, the more and the longer you drink, the greater the risk of damage, though the condition doesn’t develop in everyone who drinks heavily, so other factors are clearly involved.¹⁶ The NIAAA defines heavy drinking as more than 4 drinks a day (or 14 a week) for men, and more than 3 a day (or 7 a week) for women. Women tend to be more vulnerable to this kind of harm, even after accounting for smaller body size.¹⁶

Early damage often causes no symptoms at all, which is part of what makes it dangerous. As the disease advances, declining liver function can progress to cirrhosis and, in severe cases, liver failure. The encouraging part: stopping drinking early can halt or even reverse some of that damage before it becomes permanent.

When Excessive Drinking Becomes an Addiction

Alcohol is socially acceptable in most settings, which is part of why it can be hard to tell when your drinking has become a problem. If you’ve noticed signs of high-functioning alcoholism in yourself or someone you love, it may be time to look closer.

When drinking starts to feel out of your control, it may have crossed into alcohol addiction, clinically known as alcohol use disorder. Like other substance use disorders, it’s a medical condition, not a lack of willpower, and it’s treatable. One common sign is that stopping brings on withdrawal symptoms. Alcohol withdrawal can range from anxiety and shakiness to seizures, and severe cases need medical supervision.

It’s also important to know when heavy drinking turns into a medical emergency. Alcohol poisoning happens when your BAC climbs high enough to suppress the reflexes that keep you breathing.¹⁷ Signs include confusion, vomiting, slow or irregular breathing, and unconsciousness. If you suspect alcohol poisoning, call 911 right away.

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