Alcohol withdrawal typically lasts 5 to 7 days for the acute phase, though symptoms can start as early as 6 hours after your last drink and peak between 24 and 72 hours. The full picture is more nuanced than a single number, because the timeline depends on how much you’ve been drinking, how long, and whether you’ve gone through withdrawal before.
When Withdrawal Symptoms Start
Your body clears alcohol at a rate of about .015 to .020 blood alcohol concentration per hour. That means someone at the legal limit of .08 would reach zero in roughly 4 to 5 hours. Withdrawal doesn’t wait for your blood alcohol to hit zero, though. For heavy, long-term drinkers, the nervous system starts reacting as alcohol levels drop, sometimes while there’s still alcohol in the bloodstream.
The earliest symptoms typically show up 6 to 12 hours after the last drink. These include anxiety, trembling hands, nausea, sweating, headache, and insomnia. For people with mild dependence, this may be the worst of it. For others, it’s just the beginning.
The First 72 Hours: Peak Risk
The most dangerous window falls within the first three days. Here’s how it generally breaks down:
- 6 to 24 hours: Minor symptoms like anxiety, shaking, nausea, and irritability. Some people experience hallucinations (seeing, hearing, or feeling things that aren’t there) starting around 12 to 24 hours.
- 12 to 48 hours: Seizure risk is highest. These are major motor seizures that occur even in people who have no seizure history and whose brain activity is otherwise normal. They typically hit within 12 to 24 hours of the last drink.
- 48 to 72 hours: Symptoms peak in intensity. This is when delirium tremens (DTs) can develop in severe cases, bringing confusion, rapid heartbeat, fever, and dangerous spikes in blood pressure.
Clinicians assess withdrawal severity on a standardized scale. Scores below 8 to 10 indicate mild withdrawal. Scores of 8 to 15 reflect moderate withdrawal with noticeable changes in heart rate, blood pressure, and sweating. Scores above 15 signal severe withdrawal and the possibility of delirium tremens.
Delirium Tremens: The Serious End
DTs affect a small percentage of people going through withdrawal, but they’re a medical emergency. Even with proper hospital treatment, the mortality rate ranges from 5 to 15%. Before modern intensive care existed, that number was as high as 35%. DTs typically begin 48 to 72 hours after the last drink, though onset can occasionally be later.
The hallmarks of DTs are severe confusion, agitation, fever, drenching sweats, and hallucinations that feel completely real. People in this state often don’t know where they are or what’s happening. DTs can last 3 to 5 days once they begin, and the entire episode requires medical supervision.
Days 4 Through 7: Gradual Improvement
For most people, acute symptoms begin to ease after the 72-hour peak. Anxiety, sleep problems, and mild tremors may linger through the end of the first week, but the intensity drops noticeably day by day. By day 7, the physical danger of acute withdrawal has generally passed.
That said, “generally passed” is doing real work in that sentence. Some people, particularly those with severe dependence or complicating health conditions, have a slower course. The timeline isn’t a guarantee.
Why Each Withdrawal Gets Worse
One of the most important things to understand about alcohol withdrawal is the kindling effect. Each time you go through withdrawal, your nervous system becomes more excitable, making the next episode more severe. Research shows that people with a history of complicated withdrawal are almost 7 times more likely to experience severe withdrawal again.
This isn’t just about discomfort. Kindling raises the risk of seizures with each successive withdrawal because the brain develops a lower threshold for them over time. It also increases the likelihood of developing delirium tremens. Someone whose first withdrawal was mild might find their third or fourth withdrawal far more dangerous, even if their drinking pattern hasn’t changed much.
Post-Acute Withdrawal: Months to a Year
The acute phase ending at one week doesn’t mean all symptoms disappear. Post-acute withdrawal syndrome (PAWS) can persist for months or, in some cases, longer than a year. Unlike the physical crisis of the first week, PAWS is subtler but can seriously affect daily life and is a major driver of relapse.
The most common PAWS symptoms include depression, irritability, mood swings, anxiety, difficulty concentrating, sleep problems, and cravings. These symptoms tend to come in waves rather than staying constant. You might feel fine for a week, then hit a rough stretch of poor sleep and low mood for several days. The waves generally become less frequent and less intense over time, but the unpredictability can be frustrating.
Understanding that PAWS is a recognized part of recovery, not a personal failing, helps people plan for it. Exercise, consistent sleep habits, and structured support all reduce the impact of these lingering symptoms.
What Affects Your Timeline
No two people follow the exact same withdrawal schedule. Several factors push the timeline shorter or longer, milder or more severe:
- Duration and amount of drinking: Years of heavy daily drinking produce more severe withdrawal than a few months of moderate excess.
- Previous withdrawals: Due to kindling, each prior episode raises the baseline severity of the next one.
- Overall health: Liver function, nutritional status, and coexisting medical conditions all influence how your body handles the stress of withdrawal.
- Age: Older adults tend to experience more severe and prolonged symptoms.
- Use of other substances: Concurrent use of sedatives or other drugs can complicate both the timeline and severity.
Someone with a short history of heavy drinking and no prior withdrawals might be through the worst in 3 to 4 days with relatively mild symptoms. Someone with a decade of daily drinking and two previous detox attempts could face a week of severe acute withdrawal followed by months of post-acute symptoms. The range is wide, which is why medical supervision during detox matters, especially if you’ve been through withdrawal before or have been drinking heavily for a long time.