Alcohol Withdrawal Timeline: Symptoms Hour by Hour & When It's Dangerous

Alcohol withdrawal usually starts 6 to 24 hours after the last drink. Symptoms peak between 24 and 72 hours and ease for most people within about a week. Seizures are most likely in the first 48 hours, and delirium tremens can start around days 2 to 4. Sleep and mood problems can last for months.

Planning to stop drinking? Book a withdrawal risk check with a MATClinics clinician first. If someone in withdrawal has a seizure or becomes confused, call 911 right away.

What Is Alcohol Withdrawal?

Alcohol withdrawal is the group of physical and mental symptoms that show up when someone who drinks heavily and regularly stops or cuts back sharply. It happens because the brain has adapted to having alcohol around.

Alcohol slows the brain down. After months or years of daily drinking, the brain pushes back by turning up its own "go" signals to stay balanced. When the alcohol is suddenly gone, those signals have nothing to hold them in check. The result is an overactive nervous system: shaking, sweating, a racing heart, anxiety and, in severe cases, seizures.

Withdrawal is common. Cleveland Clinic estimates it affects about 50% of people with alcohol use disorder who stop or sharply reduce drinking. The National Institute on Alcohol Abuse and Alcoholism (NIAAA) calls it "a potentially life-threatening process." To learn how long-term drinking changes the brain, read what alcoholism does to the brain.

Alcohol Withdrawal Timeline: What Happens Hour by Hour

Most people go through the stages below in roughly this order. The hours are typical ranges from StatPearls, MedlinePlus and Cleveland Clinic, not exact predictions.

Someone with a history of bad withdrawals may move through the stages faster and with stronger symptoms. Someone with milder dependence may never get past the first stage.

6 to 12 Hours After the Last Drink

Early symptoms often start while some alcohol is still in the blood. MedlinePlus says they usually begin within 8 hours, though they can be delayed by days. Common early signs include:

• Shaky hands (tremor)
• Anxiety, irritability or a sense of dread
• Sweating and clammy skin
• Nausea, loss of appetite or vomiting
• Headache
• Trouble falling asleep
• A fast heartbeat

Many people know this stage as the "morning shakes" that a drink makes go away. Needing a drink to feel steady is itself a sign of physical dependence.

12 to 48 Hours

Two serious problems can start in this window. The first is alcoholic hallucinosis: seeing, hearing or feeling things that aren't there, while still knowing where you are. StatPearls reports that it affects about 2% of people in withdrawal and usually clears within 24 to 48 hours.

The second is a withdrawal seizure. According to StatPearls, these seizures usually happen 8 to 48 hours after the last drink, and they can start within just a few hours. They are typically full-body convulsions. Any seizure during withdrawal needs emergency care, even if the person seems fine afterward.

24 to 72 Hours

This is when symptoms are usually at their worst. MedlinePlus puts the peak at 24 to 72 hours, and StatPearls places it around 72 hours. Pulse, blood pressure and body temperature may rise. For people with mild to moderate withdrawal, Cleveland Clinic notes that symptoms usually peak and then start to improve during this stretch.

48 to 96 Hours

Delirium tremens (DTs) is the most dangerous form of withdrawal. StatPearls says it can begin as early as 48 hours after heavy drinking stops and last up to 5 days. About 3% to 5% of people in alcohol withdrawal develop it.

Signs include severe confusion, not knowing where you are, agitation, fever, heavy sweating and hallucinations. DTs must be treated in a hospital, often in intensive care. Our guide to delirium tremens explains the symptoms and hospital treatment.

Days 5 to 7

For most people, the physical symptoms fade by the end of the first week. The Substance Abuse and Mental Health Services Administration (SAMHSA) lists the acute phase of alcohol withdrawal as 5 to 7 days.

Shaking and sweating usually settle first. Sleep is often the last thing to get back to normal.

Weeks to Months Later

Some symptoms can outlast the first week. MedlinePlus notes that sleep changes, mood swings and tiredness may last for months.

SAMHSA describes a longer pattern, often called post-acute withdrawal. It can include anxiety, irritability, low mood, trouble concentrating and cravings. In sleep studies reviewed by SAMHSA, sleep problems lasted 1 to 3 years after people stopped drinking. Not everyone has these symptoms, and they tend to come and go in waves.

Mild, Moderate and Severe Withdrawal: How Clinicians Tell the Difference

Clinicians measure withdrawal with a 10-item checklist called the CIWA-Ar (Clinical Institute Withdrawal Assessment for Alcohol, revised). It scores symptoms like tremor, sweating, nausea, anxiety, agitation and changes in touch, hearing and vision.

The CIWA-Ar is a clinical tool, not a home quiz. The American Society of Addiction Medicine (ASAM) alcohol withdrawal guideline uses these score ranges:

• Mild (score under 10): Shaking, anxiety, sweating, poor sleep and nausea, but the person thinks clearly. Often manageable outside a hospital if no other risk factors are present.
• Moderate (score 10 to 18): Stronger shaking, a faster pulse, higher blood pressure and more anxiety. Usually needs medication and close follow-up.
• Severe (score 19 or higher): Marked agitation, heavy sweating, and very high pulse and blood pressure. ASAM advises sending these patients straight to the nearest emergency department.
• Complicated: Any withdrawal that includes a seizure, delirium or new hallucinations, no matter the score.

ASAM stresses that the score supports a clinician's judgment. It does not replace it, and it should not be used on its own to diagnose withdrawal.

Alcohol Withdrawal Seizures: Who Is at Risk and What to Do

A withdrawal seizure can happen to someone who has never had one before. It can also be the first serious sign that withdrawal has started.

Repeated withdrawals raise the risk over time. StatPearls explains that each round of alcohol withdrawal lowers the brain's seizure threshold, a process called kindling. That is why someone who has quit cold turkey several times may face more danger now than they did the first time.

If you see someone having a seizure:

• Call 911.
• Move hard or sharp objects away and cushion their head.
• Once the shaking stops, roll them onto their side so they can breathe.
• Do not put anything in their mouth or try to hold them down.
• Stay with them until help arrives, and tell responders when they last drank.

After a withdrawal seizure, ASAM recommends checking the patient every 1 to 2 hours for 6 to 24 hours. More seizures or delirium can follow, so this monitoring belongs in a medical setting.

Risk Factors for Severe Alcohol Withdrawal

The ASAM guideline names the factors most closely linked to severe or complicated withdrawal:

• A past episode of DTs or a withdrawal seizure
• Many previous withdrawals over a lifetime
• Other medical or surgical illness, especially a traumatic brain injury
• Age over 65
• A long history of heavy, regular drinking
• A seizure during the current withdrawal
• A very fast pulse, high blood pressure or other signs of an overactive nervous system at the first exam
• Physical dependence on benzodiazepines (such as Xanax or Klonopin) or barbiturates

ASAM adds that other drug use, withdrawal symptoms while alcohol is still in the blood, and an active mental health condition can also raise risk. The more of these factors a person has, the higher the risk. Hospitals often use the Prediction of Alcohol Withdrawal Severity Scale (PAWSS), where a score of 4 or more signals high risk.

Nutrition matters too. Heavy drinking drains thiamine (vitamin B1), and a severe shortage can cause a brain disorder called Wernicke encephalopathy. The Merck Manual lists its classic signs as sudden confusion, abnormal eye movements and an unsteady walk. ASAM recommends thiamine for every patient treated for withdrawal for this reason.

How Long Does Alcohol Withdrawal Last?

The acute phase of alcohol withdrawal usually lasts about 5 to 7 days. The worst symptoms come 24 to 72 hours after the last drink. Severe cases, including DTs, can last longer and usually need a hospital stay.

Recovery after the first week varies. Some people feel much better within two weeks, while others deal with poor sleep, low mood, anxiety and cravings for months.

These lingering symptoms are a common reason people start drinking again, because a drink briefly quiets them. Planning for this stretch with counseling and, when appropriate, medication for alcohol use disorder makes it much easier to stay stopped.

When to Go to the ER for Alcohol Withdrawal

Go to an emergency department or call 911 if you notice any of these:

• A seizure of any kind
• Confusion, disorientation or not recognizing familiar people
• Hallucinations (seeing, hearing or feeling things that aren't there)
• Vomiting that won't stop, or being unable to keep fluids or medicine down
• Fever, chest pain, fainting or a racing heartbeat that won't settle
• Severe agitation or shaking that keeps getting worse
• Withdrawal while also stopping benzodiazepines, sleeping pills or other sedatives

ASAM uses these same warning signs to move patients from outpatient care to a higher level of care. Don't wait to see if they pass. Symptoms in the 48- to 96-hour window can get worse quickly.

For a mental health or substance use crisis, call or text 988. The SAMHSA National Helpline (1-800-662-4357) offers free treatment referrals 24 hours a day.

Medical Detox vs. Outpatient Support: Which Do You Need?

The right setting depends on your risk, not your willpower. ASAM says alcohol withdrawal "can typically be safely managed in an ambulatory setting" for people with few risk factors. Ambulatory means outpatient: you sleep at home and check in with a clinician.

ASAM lists conditions that should all be true before someone leaves the emergency department for outpatient withdrawal care:

• Mild withdrawal, or moderate withdrawal with no complicating factors
• Not currently intoxicated
• No history of withdrawal seizures or delirium
• No serious medical or mental health conditions that would complicate care
• Able to keep follow-up visits

When Inpatient or Hospital Detox Is Safer

Some people need withdrawal managed in a hospital or residential detox program. This includes people with a history of seizures or DTs, serious medical illness, dependence on other sedatives, severe symptoms at the start, or no one at home to help.

In these settings, staff can watch pulse, blood pressure and breathing around the clock. They can also adjust medication quickly if symptoms change.

What Outpatient Withdrawal Care Looks Like

When outpatient care is a safe option, ASAM describes daily check-ins for up to five days, thiamine, and medication when needed. Benzodiazepines are the first-choice medication because they ease symptoms and lower the chance of seizures and delirium.

Gabapentin or carbamazepine are alternatives for some patients. ASAM notes gabapentin can make sense when a clinician also plans to use it for longer-term alcohol use disorder treatment. A support person at home is part of the plan.

Your clinician sets and adjusts any doses based on your symptoms, pulse and blood pressure. Don't try to taper off alcohol or withdrawal medication on your own.

Why Detox Is Only the First Step

Getting through withdrawal is not the same as treating alcohol use disorder. ASAM puts it plainly: "alcohol withdrawal management alone is not an effective treatment for alcohol use disorder."

The guideline calls for linking people to ongoing care, starting medication for alcohol use disorder when possible, and follow-up visits at least monthly for a year. FDA-approved medications include naltrexone (a daily pill or the monthly Vivitrol® shot), acamprosate and disulfiram. Our comparison of medications for alcohol use disorder explains how each one works.

How MATClinics Helps After Withdrawal

MATClinics provides outpatient alcohol use disorder treatment at eight Maryland locations and by telehealth. We don't provide emergency or inpatient detox.

At your first visit, a clinician assesses your withdrawal risk. If you need medically supervised detox before outpatient care can begin, we help arrange it. Once withdrawal is behind you, your care can include:

• Vivitrol® (extended-release naltrexone) and other medications for alcohol use disorder, as your clinician recommends
• Substance use counseling, including daytime and evening groups with telehealth options
• Psychiatric care for anxiety, depression or sleep problems that often show up after drinking stops

Get a Withdrawal Risk Check Before You Quit

Many people decide to quit over a weekend and are in the worst of withdrawal by midweek. Seeing a clinician first lets you know whether outpatient care is safe for you or whether you should start with supervised detox.

Our offices stay open until 8 p.m. Tuesday through Thursday and are open Saturday mornings, so an assessment doesn't have to cost you a workday. Request an appointment online and let us know when you last drank, or call 410-220-0720. You can also check which insurance plans we take before your visit.

Frequently Asked Questions

How Many Days Does Alcohol Detox Take?

Alcohol detox, the acute withdrawal phase, usually lasts 5 to 7 days. Symptoms peak 24 to 72 hours after the last drink. Delirium tremens, when it happens, can last up to 5 days on its own, and sleep or mood problems may continue for weeks or months.

Can Alcohol Withdrawal Kill You?

Yes. Alcohol withdrawal can be fatal, mainly through seizures and delirium tremens. StatPearls reports that deaths from withdrawal delirium were once as high as 20% but are now around 1% with fast diagnosis and hospital treatment. That difference is why medical supervision matters for people at higher risk.

How Soon After Your Last Drink Can a Withdrawal Seizure Happen?

Withdrawal seizures usually happen 8 to 48 hours after the last drink, according to StatPearls, and can start within just a few hours. The risk is higher for people who have had withdrawal seizures or several past withdrawals. Any seizure during withdrawal needs a 911 call.

Is It Safe to Quit Drinking Cold Turkey?

For someone who drinks heavily every day, quitting suddenly without medical advice is risky because it can trigger seizures or DTs. People who drink less, or less often, may have mild symptoms or none. A clinician can assess your risk and tell you whether outpatient care or supervised detox is safer.

What Are the First Signs of Alcohol Withdrawal?

The first signs are usually shaky hands, anxiety, sweating, nausea, headache and trouble sleeping. They often start 6 to 12 hours after the last drink, sometimes while alcohol is still in your system. A fast heartbeat is also common.

Can Alcohol Withdrawal Be Managed at Home?

Mild withdrawal can often be managed outside a hospital, but only with a clinician directing care, daily check-ins and a support person present, according to ASAM. People with a history of seizures or DTs, serious health problems or dependence on sedatives need a supervised setting. Quitting at home without medical guidance is not recommended.