Symptoms of Alcohol Withdrawal
Alcohol withdrawal symptoms typically begin within 6-24 hours after the last drink and include increased blood pressure and pulse rate, tremors, hyperreflexia, irritability, anxiety, headache, nausea, and vomiting, which can progress to life-threatening complications including delirium tremens, seizures, coma, cardiac arrest, and death. 1
Timeline and Progression
The symptom timeline follows a predictable pattern:
- 6-24 hours: Light to moderate withdrawal begins with autonomic symptoms
- 12-24 hours: Hallucinations may develop (occurs in 2-8% of patients) 2
- 12-48 hours: Withdrawal seizures can occur (affects up to 15% of patients) 2
- 48-72 hours: Delirium tremens typically appears (occurs in 3-5% of patients) 2
- Peak symptoms: 1-3 days after cessation
- Duration: Symptoms can extend up to 2 weeks 2
Specific Symptom Categories
Mild to Moderate Symptoms
- Autonomic hyperactivity: Increased blood pressure, tachycardia, diaphoresis 1, 3
- Neurological: Tremors (especially hands), hyperreflexia 1, 3
- Psychological: Anxiety, irritability, agitation 1, 3
- Gastrointestinal: Nausea, vomiting 1, 3
- General: Headache, insomnia 4, 5
Severe Symptoms (Complicated Withdrawal)
- Delirium tremens: Marked inattentiveness, fluctuating alertness, severe agitation, marked tremulousness, sympathetic overactivity 6
- Seizures: Typically generalized without focal features, occurring singly or in brief clusters (though status epilepticus can occur) 6
- Hallucinations: Visual, auditory, or tactile (typically 12-24 hours after last drink) 2, 6
- Severe autonomic instability: Fever, profuse sweating, severe hypertension 6
- Life-threatening complications: Coma, cardiac arrest, death 1
Critical Clinical Context
Without recognition or prompt treatment, mortality from delirium tremens can reach 50% 2, making early identification crucial. The pathophysiology involves chronic alcohol's downregulation of CNS inhibitory GABA receptors and upregulation of excitatory NMDA receptors, creating CNS hyperexcitability upon alcohol cessation 2.
Assessment Tools
The Clinical Institute Withdrawal Assessment for Alcohol-Revised (CIWA-Ar) is useful for severity assessment in clinical practice 1:
- CIWA-Ar score >8: Indicates moderate withdrawal
- CIWA-Ar score ≥15: Indicates severe withdrawal requiring pharmacological treatment 1
However, high CIWA scores can occur in conditions mimicking withdrawal (anxiolytic withdrawal, anxiety disorder, sepsis, hepatic encephalopathy, severe pain), so it should not be used alone for diagnosis 4.
Important Caveats
Watch for comorbid conditions that complicate the clinical picture 4:
- Dehydration and electrolyte imbalances (especially magnesium)
- Renal failure
- Head trauma
- Infection or sepsis
- Gastrointestinal bleeding
- Pancreatitis
- Liver failure
- Hypoglycemia
- Wernicke-Korsakoff syndrome 6
Thiamine deficiency is common in alcohol-dependent patients and should be addressed immediately (100-300 mg/day) to prevent Wernicke's encephalopathy, particularly before administering IV glucose 4, 2.