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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.

Alcohol- and drug-related seizures

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

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Escalate

A seizure lasting 5 minutes or more, repeated seizures without recovery, persisting hypoxia, severe agitation or hyperthermia, suspected poisoning, head injury, focal deficit, pregnancy, meningism, hypoglycaemia or delirium tremens requires immediate ABCDE care, senior emergency support and treatment under the local status-epilepticus or poisoning pathway.

Synopsis

Recognise an acutely provoked seizure related to alcohol or drugs, treat immediate threats and withdrawal safely, and avoid mislabelling a reversible toxic presentation as chronic epilepsy.

  • Call a seizure provoked only when there is a credible time-linked insult; alcohol use, a positive toxicology result or a missed prescription does not by itself prove causation.
  • Alcohol-withdrawal seizures are usually generalised tonic-clonic events occurring roughly 6–48 hours after a marked reduction or cessation, but timing varies and alternative causes remain common.
  • Check capillary glucose immediately, protect the airway, give oxygen when indicated, time the event and treat at 5 minutes as convulsive status epilepticus according to the local protocol.
  • After a withdrawal seizure, offer a rapid-acting benzodiazepine to reduce recurrence when clinically indicated; NICE advises against phenytoin for treating alcohol-withdrawal seizures.
  • Give parenteral thiamine before or alongside carbohydrate when harmful or dependent drinking and malnutrition create risk of Wernicke encephalopathy; never delay correction of hypoglycaemia.
  • Stimulants, tramadol, bupropion, tricyclic antidepressants, isoniazid and several novel psychoactive substances can provoke seizures through different toxic mechanisms and need poison-specific advice.
  • Do not start long-term antiseizure medication automatically after a clearly provoked event; recurrence risk depends on removal of the insult and whether imaging, EEG or history suggests an enduring epileptic tendency.
  • Driving, occupational and safeguarding advice still matters after a provoked seizure; document the exact trigger and direct the person to current DVLA rules rather than promising a fixed restriction.
  • Use local alcohol-withdrawal scales and regimens only in appropriately trained settings because intoxication, head injury, hepatic impairment and other sedatives can make benzodiazepine dosing hazardous.

Key red flags

Alcohol withdrawal pattern

Generalised convulsions after recent marked reduction or cessation, accompanied by autonomic withdrawal features and a credible dependence history, support but do not prove alcohol withdrawal.

Delirium tremens

Fluctuating confusion, severe agitation, hallucinations, fever and marked autonomic overactivity after alcohol reduction indicate a medical emergency with substantial morbidity and mortality.

Toxic sympathomimetic state

Agitation, mydriasis, diaphoresis, tachycardia, hypertension and hyperthermia with seizures suggest stimulant or other sympathomimetic toxicity and demand rapid cooling and toxicology support.

Alternative intracranial cause

Focal onset, persistent lateralising signs, meningism, disproportionate headache, anticoagulation or significant head trauma should redirect assessment towards structural bleeding, stroke, infection or another neurological lesion.

Wernicke risk

Confusion, gait or oculomotor abnormality in a malnourished dependent drinker may be incomplete Wernicke encephalopathy; absence of the classic triad does not make it safe to withhold parenteral thiamine.

Sedative withdrawal

Abrupt cessation of regular benzodiazepines or related sedatives can cause anxiety, tremor, perceptual symptoms and seizures, sometimes later than alcohol withdrawal because drug half-lives differ.

Investigation priorities

01
Bedside glucose and physiological observationsFirst step

Find immediately reversible danger and quantify respiratory, cardiovascular and temperature disturbance.

Management branches

Active seizureStabilise and terminate convulsions

Convulsive activity is continuing or recurs without full recovery.

  1. Start ABCDE care, protect from injury, time the seizure, check capillary glucose and obtain airway and senior resuscitation help without restraining limbs or placing objects in the mouth.
  2. At 5 minutes follow the local convulsive status pathway, using an appropriate first-line benzodiazepine route and escalating promptly if the seizure continues.
  3. Correct hypoglycaemia and other immediately dangerous physiology, provide parenteral thiamine where indicated, and seek NPIS advice early when poisoning is possible.
  4. Escalate refractory seizures, respiratory failure, hyperthermia, severe acidosis or dysrhythmia to critical care for airway control and mechanism-specific treatment.
Recovered patientProve the trigger without anchoring

The convulsion has stopped and immediate physiology is stable.

  1. Obtain witness and recovery details, examine for focal neurology, meningism and injury, and build an hour-by-hour alcohol, medicine and recreational-drug timeline.
  2. Check glucose, ECG and targeted laboratory tests, then image or investigate as a first seizure when focal features, trauma, persistent confusion or diagnostic uncertainty remains.

Key medicines

Lorazepam for an alcohol-withdrawal seizureFollow the local emergency protocol; NICE describes intravenous lorazepam as a rapid-acting option after a withdrawal seizure.Repeated doses can cause respiratory depression and oversedation, especially with alcohol, opioids, head injury or liver disease; use monitoring and trained staff.
Parenteral thiamineUse the local high-potency intravenous or intramuscular regimen for suspected Wernicke encephalopathy or high-risk harmful drinking.Give in a setting able to manage rare anaphylaxis; oral absorption is inadequate for suspected Wernicke encephalopathy, and glucose treatment must not be delayed.
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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.

  • NICE CG100 alcohol-use disorders physical complicationsWithdrawal seizures, delirium tremens and thiamine recommendations.
  • NICE CG115 alcohol-use disorders diagnosis and managementAssessment, assisted withdrawal and continuing treatment.
  • NICE NG217 epilepsies diagnosis and managementFirst-seizure assessment, acute safety and long-term treatment principles.
  • National Poisons Information ServiceUK clinician toxicology advice and access to TOXBASE.
  • DVLA neurological disorders guidance for cliniciansCurrent provoked-seizure and licensing framework.

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

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom
  • Treat the defined withdrawal or poisoning syndrome with a trained local protocol rather than attributing every abnormality to alcohol use.
  • Before discharge address further-withdrawal risk, nutrition, dependence treatment, mental health, safeguarding, driving and a reliable plan for reassessment.