Alcohol Withdrawal

What Is Alcohol Withdrawal?

Alcohol withdrawal is a medical condition that can develop when a person who has been drinking heavily over a prolonged period suddenly reduces or stops their alcohol intake^[1]. It ranges from mild discomfort to a life-threatening emergency. Understanding what withdrawal looks like, why it can escalate quickly, and when to seek help can make the difference between a safe recovery and a dangerous crisis.

During possible withdrawal, call 911 or go to an emergency department for seizures, fever, severe confusion, hallucinations, or irregular heartbeats. If you think you may be in withdrawal, contact a healthcare provider promptly or go to an emergency department, especially after frequent drinking followed by stopping.^[2]

Why Alcohol Withdrawal Happens

Physical dependence means the body has adapted to ongoing alcohol exposure. When alcohol is abruptly reduced or stopped, the nervous system can become overactive. Clinicians call this hyperexcitation. This response helps explain why withdrawal can involve shaking, sweating, a racing heart, agitation, and—in severe cases—seizures or delirium.^[4][5][6]

Withdrawal is a physiological response that requires assessment. It does not establish the severity of alcohol use disorder by itself. If physical dependence is possible, seek medical guidance before abruptly stopping or sharply reducing alcohol.^[1][7]

Who Is at Risk of Severe Alcohol Withdrawal?

Not everyone who drinks heavily will experience dangerous withdrawal. Most people with alcohol use disorder will not develop complicated withdrawal^[8].

However, several factors raise the likelihood of a severe course:

• Prior withdrawal seizures or delirium tremens. There is strong empirical and clinical support for a history of alcohol-related seizures or delirium as predictive of future incidences of severe withdrawal^[6][9].
• Current moderate-to-severe withdrawal signs on presentation — for example, a score of 10 or above on the CIWA-Ar, a validated clinical rating scale^[6].
• Baseline systolic blood pressure of 140 mm Hg or higher, which was associated with an increased likelihood of severe withdrawal in a systematic review and meta-analysis of 14 studies including 71,295 patients^[9].
• Multiple risk factors occurring together. The risk of complicated withdrawal or its complications is increased by the presence of multiple individual risk factors^[6].
• Older age, which has been identified as a risk factor for complicated withdrawal or complications of withdrawal^[6].
• Vulnerability factors such as frailty, cognitive impairment, multiple other medical conditions, lack of social support, or learning difficulties. NICE guidance recommends a lower threshold for hospital admission in these groups^[1].

Clinical tools such as the Prediction of Alcohol Withdrawal Severity Scale (PAWSS) can help identify people at high risk before withdrawal begins. In one analysis, a PAWSS score of 4 or more had a specificity of 0.93 and a score of 3 or fewer had a sensitivity of 0.99 for ruling out severe withdrawal^[9]

The Canadian guideline recommends that clinicians assess withdrawal risk even when a person declines withdrawal support, so the risks of stopping abruptly can be discussed^[8].

Symptoms and Timeline

Withdrawal symptoms can change over hours or days. The time ranges below describe patterns in clinical guidance; they are not a timetable for waiting before seeking care.^[6]

Early Signs (Beginning Roughly 6–24 Hours After the Last Drink)

Early symptoms may include anxiety, sleep disturbances, loss of appetite, vivid dreams, headache, nausea, rapid heartbeat, overactive reflexes, sweating, elevated blood pressure, and raised body temperature^[6]. The NHS lists anxiety after waking, sweating and mild tremors, nausea or retching in the morning, and vomiting as mild-to-moderate withdrawal symptoms that may indicate a need for medical support^[3].

Hallucinations (Typically 12–48 Hours)

Hallucinations — seeing, hearing, or feeling things that are not there — can develop within 12–24 hours following cessation of or reduction in alcohol use and typically resolve within 24–48 hours if other signs of withdrawal delirium do not emerge^[6].

Seizures (As Early as 8 Hours, Peaking Around 24 Hours)

Seizures may begin as early as 8 hours after cessation of or reduction in alcohol use and can continue for up to 48 hours, with peak activity occurring around 24 hours^[6].

Delirium Tremens Can Begin Days After Drinking Stops

Delirium tremens (DTs) is a severe form of withdrawal that can cause sudden confusion and can be fatal^[2]. Alcohol withdrawal delirium can develop as many as 3–5 days after alcohol is stopped or reduced^[6]. Because the syndrome can quickly progress in severity, clinicians suspecting alcohol withdrawal should gather information about recent alcohol use history^[6].

Protracted Withdrawal (Weeks to Months)

After the acute phase resolves, some symptoms can persist for weeks, months, or longer. A systematic review identified craving, sleep disturbance, and anhedonia (a reduced ability to feel pleasure) as major symptoms of protracted alcohol withdrawal^[5]

Anxiety and depression may also persist during the 3–6 months after the acute phase, though they tend to decrease over that period^[5]

These symptoms occur during a period identified as highly vulnerable to drinking relapse^[5].

Alcohol Withdrawal, Hangover, and Intoxication

A hangover follows drinking too much. It can include thirst, headache, nausea, fatigue, anxiety, and sensitivity to light or sound. Symptoms peak as blood alcohol returns to about zero and may last 24 hours or longer. A hangover can impair attention and coordination; it is not necessarily harmless.^[10]

Alcohol withdrawal follows a substantial reduction or stopping in someone with physical dependence. Tremor, sweating, anxiety, nausea, and sleep problems can overlap with hangover symptoms. The drinking history and progression matter: withdrawal can worsen over hours to days and can involve seizures or delirium.^[6][5]

Intoxication involves alcohol’s immediate effects. Severe intoxication can become an overdose, with difficulty staying conscious or breathing normally. These signs call for emergency help, even if someone assumes the person only needs to sleep.^[11]

These descriptions cannot reliably distinguish the conditions at home. Seek assessment if withdrawal is possible. During possible withdrawal, seizures, severe confusion, hallucinations, fever, or an irregular heartbeat warrant emergency care.^[2]

Alcohol Withdrawal Signs That Need Emergency Care

ASAM guidance also calls for reassessment and a more intensive setting when outpatient withdrawal is complicated by persistent vomiting, marked agitation, fainting, unstable blood pressure or heart rate, excessive sedation, or worsening medical or psychiatric illness.^[6]

NICE recommends hospital admission for people in acute withdrawal who have, or are at high risk of, withdrawal seizures or delirium tremens. This is UK guidance, consistent with the need for monitored care when dangerous complications are possible.^[1]

Why Managing Withdrawal Alone Can Be Dangerous

A sudden reduction in alcohol intake can result in severe withdrawal in dependent drinkers^[1]

The syndrome can quickly progress from mild symptoms to seizures or delirium tremens, and lack of monitoring or ready access to medical intervention can expose an at-risk person to great harm^[6]

Alcohol withdrawal syndrome can result in significant morbidity and mortality, and physicians must rapidly diagnose these conditions while evaluating for other diseases that may mimic or complicate withdrawal^[4].

For people who are alcohol dependent but not admitted to hospital, NICE recommends offering advice to avoid a sudden reduction in alcohol intake and providing information about how to contact local alcohol support services^[1]

For those identified as being at high risk for severe withdrawal complications, the risks of unsupervised withdrawal can be life threatening^[8]

In other words, the safest course is to seek professional guidance before attempting to stop.

Choosing a Care Setting for Alcohol Withdrawal

Ambulatory (Outpatient) Withdrawal Management

Most cases of withdrawal can be managed in an ambulatory setting with appropriate support^[12]. The ASAM guideline notes that ambulatory withdrawal management should be preferred in the absence of any indications for inpatient treatment, and one study found that patients in ambulatory treatment had faster resolution of withdrawal compared to inpatient treatment^[6]. Outpatient management of patients with minimal symptoms is possible^[4].

Ambulatory care typically involves daily visits to a clinic or, for patients nearing the end of withdrawal, assessment on alternate days via phone or video^[6]. Patients who are unable to attend daily can sometimes be monitored remotely, though this should be reserved for those in mild withdrawal or nearing completion^[6].

Inpatient or Medically Supported Settings

Hospital or residential medical care is appropriate when there is a risk of severe or complicated withdrawal, when a person has significant medical or psychiatric conditions requiring close monitoring, or when the home environment is unsafe or lacks adequate support^[6][1]

NICE guidance in the United Kingdom recommends hospital admission for young people under 16 in acute withdrawal, for both physical and psychosocial assessment^[1].

Intensive Rehabilitation

Some people are assessed as needing intensive rehabilitation after withdrawal, either through a community-based programme or a residential service. This is usually reserved for people with medium or high levels of alcohol dependence, or those who have received other forms of help previously that have not been successful^[3].

Community and Peer Support

Peer-led support programmes such as Alcoholics Anonymous and SMART Recovery are effective at maintaining abstinence or reductions in drinking^[12]. The NHS lists several UK-based resources including Drinkline (0300 123 1110), Alcoholics Anonymous, Al-Anon Family Groups, WithYou, Adfam, Nacoa, and SMART Recovery^[3]. A general practitioner, or primary care doctor, can help identify local community alcohol services^[3].

What to Do While Arranging Help

If you or someone you know is physically dependent on alcohol, do not stop drinking abruptly without medical advice^[1]

Contact a GP, an alcohol support service, or an emergency department depending on the severity of symptoms. If severe symptoms such as seizures, hallucinations, or severe tremors are present, call emergency services immediately^[3]

Confusion or unstable vital signs also require urgent medical evaluation and escalation to a more intensive level of care^[6].

Actions and Substances That Can Increase Risk

While waiting for or receiving help, certain actions and substances can make the situation more dangerous:

• Stopping alcohol abruptly without medical supervision can cause severe withdrawal in a person with physical dependence. A sudden reduction in alcohol intake can result in severe withdrawal^[1].
• Returning to alcohol use during a managed withdrawal process may indicate that the medication dose is not adequate to ease discomfort, or that circumstances in the person’s environment make it difficult to avoid alcohol; either situation may call for a more intensive level of care rather than simply continuing as before^[6].
• Opioid drugs pose a particular danger. Active alcohol use disorder significantly increases the risk of overdose associated with the administration of opioid drugs, and specialist advice is recommended before treatment of people dependent on both alcohol and opioid drugs^[12].
• Benzodiazepines obtained outside medical supervision carry their own risks. The Canadian guideline recommends limiting benzodiazepine prescribing in people with AUD to short-course withdrawal management for those at risk of severe withdrawal, noting the harms of chronic benzodiazepine therapy^[8].

What to Expect from Medical Assessment and Supervised Care

A medical assessment typically includes evaluation of alcohol use and its effects, physical examination, clinical investigations, and gathering of collateral history^[12]

Healthcare professionals caring for people in acute withdrawal should be skilled in the assessment and monitoring of withdrawal symptoms and signs^[1]

Validated tools such as the CIWA-Ar scale — a 10-item assessment that quantifies the severity of withdrawal — may be used as an adjunct to clinical judgement^[1].

Supervised withdrawal care generally involves medications that address the underlying nervous system hyperexcitation. Benzodiazepines are the predominant medication class used and remain the first treatment option^[4]

NICE guidance also notes carbamazepine as an option^[1]

A symptom-triggered regimen — where medication is given based on the severity of symptoms rather than on a fixed schedule — is recommended for people in hospital or other settings where 24-hour assessment and monitoring are available^[1].

Thiamine (vitamin B1) is an important part of withdrawal care. NICE recommends offering thiamine to people at high risk of developing, or with suspected, Wernicke’s encephalopathy^[1]

Thiamine should be offered to harmful or dependent drinkers who are malnourished or at risk of malnourishment, who have decompensated liver disease, or who are in acute withdrawal or undergoing planned medically assisted withdrawal^[1]

The Canadian guideline similarly recommends oral thiamine before and during withdrawal management. In inpatient settings, the Canadian guideline recommends parenteral (injected) thiamine for patients with suspected Wernicke encephalopathy, decompensated liver disease, or risk of malnourishment^[8].

Ongoing Alcohol Treatment After Withdrawal

Withdrawal management addresses the immediate medical period; most people will need some degree of help or a long-term plan to stay in control or completely alcohol-free^[3]. Return to problematic drinking is common, and aftercare should focus on addressing factors that contribute to relapse^[12].

Medications for Ongoing Support

Several medications have evidence supporting their use after withdrawal:

• Acamprosate is recommended to help maintain abstinence from alcohol^[12].
• Naltrexone is recommended for prevention of relapse to heavy drinking^[12].
• Disulfiram is recommended only in close supervision settings where patients are motivated for abstinence^[12].

The Canadian guideline raised concerns about using certain psychiatric medications to treat AUD or symptoms attributable to it. Its discussion does not replace individualized treatment of a separate psychiatric condition; the guideline explicitly distinguishes severe psychiatric conditions with appropriate on-label indications.^[8]

Meta-analyses of randomised controlled trials concluded that SSRIs and trazodone have little benefit in alcohol use disorder, and some trials found that SSRI treatment was associated with a higher number of heavy drinking days compared with placebo^[8]

Similarly, a double-blind trial of trazodone showed that the trazodone group used more alcohol both while on the medication and after it was stopped^[8]

Long-term medication planning differs from the short course used to manage high-risk withdrawal; the Canadian guideline cautions against chronic benzodiazepine prescribing in AUD^[8].

Psychosocial Approaches

Cognitive behavioural therapy should be a first-line psychosocial intervention for alcohol dependence, and its clinical benefit is enhanced when combined with pharmacotherapy or an additional psychosocial intervention such as motivational interviewing^[12]. Brief motivational interviewing interventions are more effective than no treatment for people who consume alcohol at risky levels and are most effective in primary care settings^[12].

Continuity of Care

A study of patients after hospitalization for alcohol withdrawal found that participants viewed their general practitioner as an important point of contact and valued communication between hospital and primary care teams for treatment planning and follow-up^[13]. Getting the right ongoing support can be crucial; relying only on family, friends, or carers is often not enough^[3].

Harm Reduction When Abstinence Is Not the Immediate Goal

A harm-minimisation approach should be considered for patients who are unable to reduce their drinking^[12]

A randomised trial among 308 people experiencing homelessness and alcohol use disorder found that combined behavioural harm-reduction treatment resulted in decreased alcohol use, reduced alcohol-related harm, and improved physical health-related quality of life during a 12-week treatment period compared with services as usual^[14]

Although the addition of extended-release naltrexone showed improvements across more outcomes than behavioural treatment alone, the differences between the naltrexone and placebo injection groups were not significant, so the combined effect could not be attributed to naltrexone alone^[14].

Next Steps for Alcohol Withdrawal

The next step depends on symptoms, medical risk, and whether withdrawal has already begun:

• If you are concerned about your own or someone else’s drinking, a GP is a good starting point. Be as accurate and honest as possible about how much you drink and any problems it may be causing^[3].
• If you are physically dependent, do not stop suddenly. Seek medical advice about how to reduce safely^[1][3].
• If severe symptoms appear — seizures, hallucinations, or severe tremors — call emergency services immediately^[3]. A change in mental state or unstable vital signs also calls for urgent assessment and possibly a higher level of care^[6].
• Avoid actions that increase risk. Do not stop alcohol abruptly without medical guidance if you are dependent^[1]. Be aware that opioid drugs carry a heightened overdose risk in people with active alcohol use disorder^[12], and that unsupervised use of benzodiazepines can lead to serious harms^[8].
• After withdrawal, ask about longer-term support including medications such as acamprosate or naltrexone, psychological therapies, and peer support groups^[12][3].
• Be aware of protracted symptoms. Craving, sleep disturbance, and low mood can persist for months after stopping drinking and are a recognised part of recovery, not a sign of failure^[5]. Pharmacological treatment during this period may help reduce some symptoms, particularly craving, more rapidly^[5].

Alcohol withdrawal can be fatal, especially when delirium tremens develops; medical care aims to manage symptoms and prevent complications^[2]. Recognizing the risk and seeking help before or as soon as symptoms begin are important safety steps.

In the United States, call or text 988 for mental health or substance-use crisis support. Call 911 for a life-threatening emergency.