Alcohol Withdrawal Seizures

Pathophysiology

• Down-regulation of GABA-A receptor activity (reduced inhibitory tone)
• Up-regulation and sensitification of NMDA glutamate receptors (increased excitatory tone)
• Disinhibition of the dopaminergic reward pathway

Clinical Features of Alcohol Withdrawal (Timeline)

Alcohol Withdrawal Seizures - Key Characteristics

• Timing: Typically 6-48 hours after cessation (or significant reduction); may occasionally occur up to 5 days later
• Type: Usually generalized tonic-clonic (grand mal); partial seizures account for up to 50% of alcohol-related seizures
• Multiplicity: One or a few brief convulsions; prolonged or cluster seizures are uncommon
• Incidence: Approximately 2% of individuals with alcohol use disorder develop a withdrawal seizure; risk is higher with older age, co-morbid illness, polydrug use, and higher alcohol quantities
• Status epilepticus can occur but is uncommon

Risk Factors for Seizures

• Prior history of alcohol withdrawal seizures (strongest predictor)
• Older age
• Concurrent medical problems
• Co-use of other CNS-active substances
• Heavier and more prolonged alcohol use

Assessment

• Score < 8: Mild - usually no medications needed
• Score 8-15: Moderate - likely to respond to moderate benzodiazepine doses
• Score > 15: Severe - close monitoring essential; high risk for seizures and DTs

• Full metabolic panel (glucose, electrolytes - alcoholics are susceptible to hypomagnesemia, hypokalemia, hypoglycemia)
• CT head (especially for focal/partial seizures - up to 20% have structural lesions such as hematomas, tumors, or stroke)
• Toxicology screen
• Lumbar puncture if fever is present
• ECG

Management

Immediate Treatment of Active Seizure

• Lorazepam IV 1-4 mg - preferred; the only benzodiazepine shown to decrease seizure recurrence (NNT = 5 to prevent additional seizures in the next 6 hours). Repeat every 5-15 minutes as needed.
• Diazepam IV 5 mg every 5-10 minutes - rapid onset (1-3 min), useful for severe withdrawal; escalate to 10 mg, then 20 mg if needed.
• All benzodiazepines are equally efficacious in terminating a seizure; lorazepam has the evidence edge for preventing recurrence.

• Avoid chlordiazepoxide (hepatically cleared)
• Prefer oxazepam or lorazepam (renally conjugated, no active metabolites)

Prophylaxis and Ongoing Treatment

• Long-acting benzodiazepines (chlordiazepoxide, diazepam) are preferred for prophylaxis in those with prior seizure history
• Chlordiazepoxide PO 25-50 mg q6-8h (max 300 mg/day) with taper over 3-5 days is a common regimen
• Symptom-triggered dosing (guided by CIWA-Ar) is preferred over fixed-schedule dosing - reduces total benzodiazepine use

Adjunctive / Refractory Cases

• Phenobarbital - alternative/adjunct for benzodiazepine-resistant cases
• Ketamine infusions (0.012-1.6 mg/kg/h) - emerging evidence as adjunct
• Propofol or dexmedetomidine - for refractory DTs in ICU
• Carbamazepine - some units use carbamazepine loading when seizures occur despite adequate benzodiazepine loading
• Phenytoin is NOT effective for alcohol withdrawal seizures - neither alone nor combined with benzodiazepines. This is a common exam point.

What NOT to Do

• Do not use phenytoin - ineffective for this indication
• Antiepileptic drugs (AEDs) are not indicated for typical alcohol withdrawal seizures once resolved (no evidence for long-term AED therapy when the seizure is clearly alcohol-related)
• No prophylactic additional anticonvulsants beyond benzodiazepines
• Avoid IV fluids unless there is a specific indication (most withdrawing patients are normo- or hyperhydrated)
• Antipsychotics are not recommended as first-line for AWS (they lower seizure threshold)

Supportive Care

• Thiamine 100-500 mg IM/IV before any glucose administration (to prevent precipitating Wernicke's encephalopathy)
• Multivitamins including folic acid
• Correct electrolytes: magnesium, potassium, phosphate
• Monitor and treat hypoglycemia

Delirium Tremens (DTs) - the Severe End

• Occurs in 5-10% of alcohol-withdrawal hospitalizations
• Mortality can be up to 5-15% if untreated - a medical emergency
• Requires ICU-level care
• High-dose benzodiazepines (up to 800 mg/day chlordiazepoxide equivalents reported)
• Course is typically 3-5 days regardless of therapy

Disposition

• First-ever alcohol-related seizure: Full evaluation (labs, imaging) is mandatory before attributing it to alcohol withdrawal
• Patients may be discharged after 4-6 hours of observation if seizure-free, symptom-free, and workup is normal
• Prior history of withdrawal seizures + active withdrawal signs: Admit for IV benzodiazepines and monitoring
• Any patient with DTs criteria: ICU admission
• Refer all patients to detoxification/rehabilitation programs on discharge

• ROSEN's Emergency Medicine, pp. 2890-2892
• Harrison's Principles of Internal Medicine (22e, 2025), p. 3723
• The Washington Manual of Medical Therapeutics, pp. 1895-1901
• The Maudsley Prescribing Guidelines in Psychiatry (15e), pp. 504-505
• Tintinalli's Emergency Medicine