Skip to textbook content
Doctor’s PassportTextbook
TopicsAll topics

Loading topic navigation…

Textbook navigation
TopicsAll topics

Loading topic navigation…
← Psychiatry indexChapter sections
OverviewAetiologyPathophysiologyClinical features and red flagsInvestigationsDifferential diagnosisManagementComplicationsMonitoring and follow-upSpecial situationsCommon pitfallsQuestionsSources
Full textbook13 sectionsOpen only what you need
Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.

Alcohol withdrawal and delirium tremens

Psychiatry · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

RapidFull
!
Complicated withdrawal needs hospital care

A withdrawal seizure, delirium with agitation or hallucinations, severe autonomic overactivity, significant electrolyte disturbance, uncontrolled vomiting or rapidly worsening symptoms can progress to injury, arrhythmia, aspiration and death.

Action: Transfer to an acute hospital, stabilise airway, breathing, circulation and glucose, treat seizure or delirium with an adequately monitored benzodiazepine regimen, give appropriate parenteral thiamine, correct fluid and electrolyte problems, and investigate infection, trauma, hepatic encephalopathy and other causes of delirium.

Overview

Recognise alcohol withdrawal early, select a safe monitored setting, use benzodiazepine regimens proportionately, and treat seizures or delirium tremens as time-critical complications while preventing oversedation and missed alternative diagnoses.

Chronic alcohol exposure produces compensatory excitation. When intake stops or falls sharply, the unopposed state causes autonomic and neurological hyperactivity. Symptoms can begin while alcohol remains measurable, especially after a large reduction from a high baseline. Establish time of last drink and recent reduction, usual units, morning drinking, previous withdrawal, seizures or delirium, other sedatives, prescribed medicines, physical illness and current nutrition. The severity of a previous withdrawal is a major clue because repeated episodes can become more dangerous.

Uncomplicated withdrawal commonly brings tremor, sweating, nausea, retching, anxiety, agitation, insomnia, headache, tachycardia and raised blood pressure. Transient visual, tactile or auditory phenomena can occur with a relatively clear sensorium. Withdrawal seizures are usually generalised and often occur within the first two days, but any first seizure needs a broad acute assessment. Delirium tremens is a fluctuating confusional state with inattention, disorientation, marked autonomic activation and often vivid hallucinations; it typically develops around days two to three and can appear up to day five.

Practice

Two practice questions

Your practice draft is saved in this browser.

Question 1 of 2
0 correct
PsychiatryOriginal SBA

Withdrawal seizure management

A man admitted after abruptly stopping heavy alcohol use has a generalised seizure and recovers consciousness. What is the most appropriate withdrawal-specific next action after immediate ABC and glucose assessment?

Choose one answer, then submit
← Rapid synopsisBack to overviewAll Psychiatry topics →
Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • DHSC alcohol guideline chapter 10 pharmacological interventionsCurrent benzodiazepine selection, monitoring and example fixed-dose tapers.
  • DHSC alcohol guideline chapter 16 acute hospitalsHospital withdrawal, delirium tremens and acute escalation.
  • NICE CG100 alcohol physical complications recommendationsAdmission, symptom-triggered care, delirium and seizure recommendations.
  • NICE CG115 alcohol dependence recommendationsAssisted-withdrawal setting and community regimen principles.
  • Chlordiazepoxide 5 mg capsules SmPCProduct-specific contraindications, interactions and safety information.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateComplete draftClinical stateAwaiting reviewJurisdictionUnited Kingdom

Choose setting before choosing tablets. NICE recommends hospital admission when acute withdrawal is accompanied by, or carries high risk of, seizures or delirium tremens. Frailty, cognitive impairment, multiple comorbidities, pregnancy, age sixteen or seventeen, learning difficulty and inadequate support justify a lower threshold. A planned community withdrawal requires a reliable patient and supporter, safe medication storage, frequent competent review, ability to escalate and no need for high doses or concurrent complex detoxification. If a dependent person is not admitted, advise against sudden unsupported reduction and provide a rapid route to specialist help.

Benzodiazepines are the standard medicines for medically assisted alcohol withdrawal, with dose driven by dependence, symptoms, age, liver function, other sedatives and setting. Chlordiazepoxide or diazepam are commonly used for planned withdrawal; a shorter-acting option such as oxazepam or lorazepam may be selected when extensive liver disease or older age raises accumulation concern. In a hospital with twenty-four-hour assessment, a symptom-triggered regimen avoids unnecessary exposure but is safe only when trained staff score and reassess reliably. Fixed community regimens still need daily review and adjustment.

Complicated withdrawal demands simultaneous treatment and diagnostic scepticism. Correct hypoglycaemia, fluid and electrolyte disturbance, give thiamine according to Wernicke risk, examine for injury and investigate sepsis, hepatic encephalopathy, intracranial disease, medication toxicity and other withdrawal states. Benzodiazepines remain central for delirium tremens; inadequate dosing must be corrected before adding an antipsychotic. A seizure calls for acute benzodiazepine treatment and revision of the withdrawal regimen, not phenytoin for the withdrawal process. Discharge planning must include relapse-prevention and alcohol-service follow-up because detoxification alone does not treat dependence.

Key points

  • Alcohol withdrawal follows a substantial fall in alcohol exposure in a neuroadapted person; do not require a zero breath-alcohol concentration before recognising it.
  • Early features include tremor, sweating, tachycardia, hypertension, nausea, anxiety, insomnia and perceptual disturbance; seizures usually occur early and delirium often emerges later.
  • People at high risk of seizures or delirium tremens should be admitted for medically assisted withdrawal; vulnerable patients warrant a lower admission threshold.
  • In hospital or another setting with continuous skilled assessment, NICE recommends a symptom-triggered regimen; planned community withdrawal generally uses an individually selected fixed taper with daily review.
  • A current national example for moderate dependence starts oral chlordiazepoxide 15 mg four times on day 1, then 10 mg four times day 2, 10 mg three times day 3, 5 mg three times day 4, 5 mg twice day 5, 5 mg at night day 6, then stop; it is an example, not a universal prescription.
  • For delirium tremens, ensure the benzodiazepine withdrawal regimen is adequate; NICE names oral lorazepam first, with parenteral lorazepam if symptoms persist or oral treatment is not possible.
  • Haloperidol is not benzodiazepine replacement or monotherapy for withdrawal delirium; current national guidance restricts it to carefully monitored adjunct use after adequate benzodiazepine because it can lower seizure threshold.
  • Treat a withdrawal seizure with a rapid-acting benzodiazepine under an acute protocol and review the withdrawal regimen; phenytoin does not treat the withdrawal mechanism.

Aetiology

01

Sustained heavy exposure

Repeated alcohol exposure drives tolerance and compensatory neural excitation, so a sudden concentration fall can unmask a hyperactive state.

02

Repeated withdrawals

Prior episodes, especially seizures or delirium, identify a nervous system and clinical history vulnerable to increasingly complicated withdrawal.

03

Concurrent physiological stress

Infection, trauma, malnutrition, liver disease, sleep loss and withdrawal from other sedatives can intensify symptoms and reduce physiological reserve.

Pathophysiology

  1. 1
    Inhibitory adaptation

    Chronic enhancement of GABA-mediated inhibition leads the brain to reduce inhibitory responsiveness during ongoing alcohol exposure.

  2. 2
    Excitatory upregulation

    Glutamatergic and autonomic systems increase activity to maintain function, becoming excessive when alcohol is abruptly reduced.

  3. 3
    Autonomic surge

    Unopposed sympathetic activity produces tremor, sweating, tachycardia, hypertension, agitation and increased metabolic demand across multiple organ systems.

  4. 4
    Network instability

    Cortical hyperexcitability can generate seizures, while widespread disturbed attention, sleep and perception contributes to withdrawal delirium.

Clinical features and red flags

Autonomic withdrawal

Coarse tremor, sweating, tachycardia, hypertension, nausea, anxiety and insomnia after reduced intake form the common early syndrome.

Perceptual disturbance

Visual, tactile or auditory experiences may occur; preserved orientation distinguishes alcoholic hallucinosis from a delirious state but still warrants assessment.

Withdrawal seizure

A usually generalised convulsion after a fall in alcohol exposure predicts further complications and requires acute evaluation and treatment.

Delirium tremens

Fluctuating attention and orientation with severe agitation, hallucinations and autonomic overactivity is a medical emergency, not merely difficult behaviour.

Oversedation

New somnolence, slurred speech, worsening ataxia, respiratory depression or falling observations during treatment signals excess medicine or another illness.

Red flags requiring action

  • A generalised seizure after alcohol reduction requires urgent assessment; consider head injury, hypoglycaemia, infection, metabolic disturbance and other toxicological causes as well as withdrawal.
  • New disorientation, fluctuating attention, marked agitation, hallucinations, fever or severe autonomic activation may indicate delirium tremens or another acute delirium.
  • Respiratory slowing, falling oxygen saturation, new ataxia or increasing drowsiness during benzodiazepine treatment suggests oversedation and requires immediate review.
  • Haematemesis, melaena, jaundice, ascites, abdominal pain, sepsis signs, arrhythmia or major electrolyte derangement requires parallel medical management.
  • Previous delirium tremens or withdrawal seizures, very heavy use, frailty, pregnancy, cognitive impairment, severe comorbidity or poor social support lowers the threshold for admission.

Investigations

  1. 01
    Repeated clinical observationsFirst step
    Why
    Track pulse, blood pressure, respiratory rate, oxygen saturation, temperature, consciousness and fluid balance.
    Interpretation and limitations
    A worsening trend, severe autonomic activation or respiratory depression determines escalation more reliably than one isolated score.
  2. 02
    Validated withdrawal scale
    Why
    Structure serial assessment and support symptom-triggered prescribing where competent round-the-clock monitoring exists.
    Interpretation and limitations
    CIWA-Ar supplements clinical judgement and becomes unreliable when delirium, communication difficulty or serious concurrent illness prevents accurate responses.
  3. 03
    Bedside glucose and electrocardiogram
    Why
    Identify reversible seizure or delirium contributors and arrhythmia risk.
    Interpretation and limitations
    Correct hypoglycaemia immediately; QT abnormality and electrolyte loss influence medicine choice and monitoring intensity.
  4. 04
    Blood count, renal, liver and electrolyte profile
    Why
    Assess dehydration, infection, organ dysfunction, magnesium and other metabolic complications.
    Interpretation and limitations
    Abnormalities require active correction and may explain delirium that persists despite apparently adequate withdrawal treatment.
  5. 05
    Cause-directed imaging and infection work-up
    Why
    Investigate head injury, focal neurology, fever, meningism, unexplained reduced consciousness or atypical seizures.
    Interpretation and limitations
    Do not attribute every seizure or confusion episode in a person who drinks to withdrawal without testing plausible alternatives.

Differential diagnosis

01

Sepsis or metabolic delirium

Fever, infection, hypoglycaemia, hypoxia, renal failure and electrolyte disturbance can closely resemble, intensify or accompany severe alcohol withdrawal.

02

Intracranial disease

Head injury, haemorrhage, stroke, meningitis and epilepsy require consideration when seizures, focal signs or prolonged reduced consciousness occur.

03

Hepatic encephalopathy

Decompensated liver disease can cause altered attention and consciousness, sometimes alongside rather than instead of alcohol withdrawal.

04

Other substance state

Stimulant intoxication, anticholinergic toxicity or withdrawal from benzodiazepines, gabapentinoids or GHB may produce overlapping agitation and seizures.

Management

01TriageSelect the safe settingFirst stepA dependent drinker has stopped, substantially reduced intake or plans medically assisted withdrawal.+
  1. 1Assess current symptoms, previous seizures or delirium, daily consumption, other sedatives, comorbidity, pregnancy, cognition and support.
  2. 2Admit when severe or complicated withdrawal is present or likely; use a lower threshold for vulnerable circumstances.
  3. 3EscalationIf community management is suitable, provide a clinician-selected fixed regimen, limited dispensing, daily review, thiamine and explicit escalation instructions.
02Hospital treatmentTreat and reassess dynamicallyWithdrawal requires an acute setting with twenty-four-hour clinical observation.+
  1. 1Begin local symptom-triggered benzodiazepine treatment with serial observations and investigate concurrent medical causes.
  2. 2Give risk-appropriate parenteral or oral thiamine and correct glucose, fluids, magnesium, potassium and phosphate as indicated.
  3. 3After each dose, reassess withdrawal control and sedation; seek critical-care support if control requires unusually high doses or physiology deteriorates.
03ComplicationEscalate seizure or deliriumEscalationA withdrawal seizure, marked confusion, hallucinations with inattention or severe agitation develops.+
  1. 1Stabilise ABC, check glucose, protect from injury and use an acute rapid-acting benzodiazepine protocol for seizure.
  2. 2For delirium tremens, review and optimise the benzodiazepine regimen; use parenteral lorazepam when oral treatment is unsuitable or ineffective.
  3. 3AlternativeInvestigate alternative delirium causes and reserve haloperidol for specialist adjunct use after adequate benzodiazepine, with seizure and cardiac cautions.
Key medicines and prescribing safety2 treatments · regimens, roles and cautions+
A benzodiazepine taper suppresses withdrawal excitation and reduces seizure and delirium risk during a planned withdrawal.

Chlordiazepoxide, planned fixed-dose example

For moderate dependence, one current national oral example is 15 mg four times daily on day 1; 10 mg four times daily day 2; 10 mg three times daily day 3; 5 mg three times daily day 4; 5 mg twice daily day 5; 5 mg at night day 6; stop day 7, with daily skilled review and adjustment.

This is an example rather than a self-detox prescription. Dose must reflect dependence and setting; reduce or choose a shorter-acting alternative for frailty or substantial liver impairment, avoid unsupervised co-use with alcohol, opioids or other sedatives, and monitor respiratory state and oversedation.

Rapid benzodiazepine treatment controls the withdrawal mechanism in delirium tremens while the broader regimen and medical causes are reviewed.

Lorazepam for delirium tremens

Use oral lorazepam as NICE first-line treatment within a hospital protocol; if delirium persists or oral medication is declined or unsafe, use parenteral lorazepam with dose and repetition determined by the acute local protocol, continuous observations and senior review.

This indication is off label in UK guidance. Monitor airway and respiration, especially with hepatic disease or other depressants; escalating requirement, persistent agitation or oversedation requires senior and critical-care input rather than unmonitored repeated dosing.

Complications

01

Seizure injury

Recurrent convulsions can cause aspiration, prolonged hypoxia, traumatic head injury and progression toward status epilepticus without rapid acute treatment.

02

Withdrawal delirium

Severe confusion and autonomic overactivity can lead to arrhythmia, hyperthermia, exhaustion, injury and death without monitored treatment.

03

Treatment toxicity

Accumulating benzodiazepines, especially with liver disease or other depressants, can produce ataxia, aspiration and respiratory failure.

04

Missed coexisting illness

Attributing every abnormality to withdrawal can delay treatment of sepsis, bleeding, trauma, Wernicke encephalopathy or hepatic failure.

Monitoring and follow-up

  • Record symptoms, orientation, vital signs, respiratory state and sedation before and after each benzodiazepine decision.
  • Review fluid balance, oral intake, glucose, magnesium, potassium, phosphate, renal function and liver status according to clinical severity.
  • Re-examine for infection, injury, hepatic encephalopathy, intracranial pathology or another toxin if the course is atypical or response is poor.
  • Assess Wernicke risk repeatedly because confusion or gait change may be masked by withdrawal, intoxication or sedation.
  • Before discharge, confirm withdrawal is controlled, benzodiazepine has a clear stop point, thiamine continues where indicated and alcohol-service follow-up is arranged.

Special situations

Alcohol level may coexist

A major fall from a high accustomed concentration can precipitate withdrawal before alcohol has completely cleared from blood.

Scores need cognition

Symptom scales depend on communication and attention; delirium or serious illness can make a numerical score misleadingly high or low.

Dose follows response

The objective is calm wakefulness with controlled autonomic signs, not sleep; both undertreatment and respiratory oversedation cause harm.

Haloperidol is adjunctive

It may reduce dangerous agitation only after withdrawal treatment is adequate and never substitutes for a benzodiazepine regimen.

Detox is a transition

Loss of tolerance and rapid return to drinking can follow discharge unless relapse prevention, psychosocial care and follow-up are connected.

Common pitfalls

  1. 01

    Waiting for a zero breath-alcohol reading before treating clinically evident withdrawal.

  2. 02

    Using CIWA-Ar mechanically in a delirious, non-communicative or medically unstable patient.

  3. 03

    Copying a fixed community regimen without assessing consumption, prior complications, liver function and sedative co-use.

  4. 04

    Using haloperidol alone for delirium tremens while the benzodiazepine regimen remains inadequate.

  5. 05

    Giving phenytoin as specific treatment for an alcohol withdrawal seizure.

  6. 06

    Labelling persistent confusion as withdrawal without investigating Wernicke encephalopathy, infection, trauma or hepatic encephalopathy.