Alcohol Withdrawal & DTs
GABA receptor downregulation from chronic alcohol use → unopposed excitatory state on cessation. Withdrawal seizures kill. DTs have 15–20% mortality if untreated. Recognize early, treat aggressively.
Monitoring
- CIWA q1-2h
- Vitals q1-4h
- Mg, K, PO₄ q12h
- Seizure precautions
- DT watch 48-72h
- Blood glucose
🔍 Overview
Timeline of Withdrawal
| Time After Last Drink | Syndrome | Features |
|---|---|---|
| 6–12 hours | Minor withdrawal | Tremor, anxiety, insomnia, nausea, tachycardia, hypertension, diaphoresis |
| 12–24 hours | Alcoholic hallucinosis | Visual/auditory/tactile hallucinations with intact sensorium (patient knows they're hallucinating). Not DTs. |
| 12–48 hours | Withdrawal seizures | Generalized tonic-clonic. Brief, self-limited. Risk of status epilepticus. Peak at 24h. Treat with benzodiazepines, NOT phenytoin (phenytoin doesn't work for withdrawal seizures). |
| 48–96 hours | Delirium tremens (DTs) | Altered sensorium (confusion, agitation, global disorientation) + autonomic instability (fever, tachycardia, HTN, diaphoresis) + hallucinations. Mortality 15–20% if untreated. |
DTs ≠ hallucinations. Alcoholic hallucinosis has intact sensorium. DTs have global confusion + autonomic storm. This is the key distinction.
Key Evidence: Symptom-triggered benzodiazepine dosing (CIWA-based) reduces total benzo dose and ICU length of stay vs fixed-schedule dosing Saitz, 1994. Phenobarbital loading is a viable alternative for severe/refractory withdrawal Rosenson, 2013. Carbamazepine may reduce seizure risk but is NOT first-line Malcolm, 2002. Dexmedetomidine as adjunct reduces benzo requirements in ICU Mueller, 2014.
🚨 Management
CIWA-Ar Protocol (Symptom-Triggered)
Score 0–67. Assess q1–4h depending on severity. Symptom-triggered dosing reduces total benzo dose and ICU stay vs fixed-schedule dosing Saitz, 1994.
| CIWA Score | Severity | Action |
|---|---|---|
| < 8 | Minimal | Monitor q4–8h. Supportive care. Thiamine, folate, banana bag. |
| 8–15 | Mild-moderate | Lorazepam 1–2 mg PO/IV q1h PRN. Reassess in 1h. |
| 16–20 | Moderate-severe | Lorazepam 2–4 mg IV q1h. Consider ICU admission. |
| > 20 | Severe / impending DTs | ICU. Lorazepam 4 mg IV q15–30 min until controlled. Consider phenobarbital. Load aggressively. |
CIWA-Ar Protocol: Score q1-2h. Score < 10: supportive care (fluids, thiamine, folate, electrolytes). Score 10-18: moderate withdrawal - chlordiazepoxide 25-50 mg PO q6h or diazepam 5-10 mg IV q5-15min. Score > 18: severe - diazepam 10-20 mg IV q5-15min until CIWA < 10. If > 200 mg diazepam without control = benzo-resistant - add phenobarbital 130-260 mg IV Gold, 2007.
Treatment Agents
| Drug (Brand) | Dose | Role | Key Notes |
|---|---|---|---|
| Lorazepam (Ativan) 1ST LINE | 1–4 mg IV q1h PRN (CIWA-guided) | First-line benzodiazepine. | No active metabolites (preferred in liver disease over diazepam). Propylene glycol toxicity with prolonged high-dose infusion. |
| Diazepam (Valium) 1ST LINE | 5–20 mg IV/PO q1h PRN | Alternative to lorazepam. Long-acting. | Active metabolites (accumulate in liver failure). Longer duration = smoother withdrawal. Often preferred for outpatient tapers. |
| Chlordiazepoxide (Librium) MILD-MODERATE | 25–100 mg PO q6h, taper over 3–5 days | Mild-moderate withdrawal (CIWA < 15). Oral only. | Long half-life (24–48h) with active metabolites → built-in self-taper, smoother withdrawal. No IV formulation -cannot use in severe withdrawal, NPO, or vomiting. Avoid in liver disease (active metabolites accumulate -use lorazepam instead). Ideal for low-risk floor patients on a fixed taper protocol. |
| Phenobarbital 1ST LINE / SEVERE | Load: 130–260 mg IV q15–30 min until controlled (total 10–20 mg/kg). Maintenance: 32–65 mg IV q6–8h. | Emerging first-line for severe AWS. Shorter ICU & hospital LOS vs benzos. | GABA-A agonist at different site than benzos, synergistic. Long half-life (80–120h) → self-tapering. Monitor for respiratory depression. Kessel, 2024: shorter LOS (2.8 vs 4.7 days), less ICU time, less mechanical ventilation vs benzos. Many centers now use front-loaded phenobarbital as primary agent for severe withdrawal Gold, 2007. |
| Dexmedetomidine (Precedex) ADJUNCT | 0.2–1.5 mcg/kg/hr IV | Adjunct only -NOT a standalone. | Reduces autonomic symptoms (tachycardia, HTN, agitation). Does NOT prevent seizures or DTs -always co-administer with a GABA agonist (benzo or phenobarbital). |
| Thiamine (Vitamin B1) GIVE FIRST | 500 mg IV TID × 3 days (high-dose Caine protocol if Wernicke suspected) or 100 mg IV daily minimum | Give BEFORE any glucose. | Glucose metabolism depletes thiamine → precipitates Wernicke encephalopathy (confusion, ataxia, ophthalmoplegia). Give thiamine to ALL alcohol withdrawal patients. |
Phenytoin does NOT work for alcohol withdrawal seizures. The mechanism is GABA-related, not sodium channel. Benzos and phenobarbital are the only effective agents. Do not waste time loading phenytoin.
🔄 Updated Practice: Old teaching: phenytoin (Dilantin) prevents or treats alcohol withdrawal seizures. This is WRONG -phenytoin does NOT work for withdrawal seizures and should NOT be used. Benzodiazepines (lorazepam, diazepam) are the treatment. For benzo-resistant withdrawal, phenobarbital is the escalation agent (not phenytoin). Front-loaded phenobarbital protocols are now used as first-line in many centers. Kessel 2024 showed phenobarbital reduced hospital LOS by nearly 2 days and decreased need for mechanical ventilation vs benzodiazepines.
📋 Clinical Example -CIWA-Guided Benzodiazepine Protocol
Patient: 48M, daily vodka drinker (1 pint/day × 15 years), last drink 14 hours ago. Tremor, anxiety, tachycardia (HR 108), diaphoresis. CIWA score: 18.
| Time | CIWA | Action |
|---|---|---|
| Hour 0 | 18 (moderate-severe) | Lorazepam (Ativan) 2mg IV. Thiamine (Vitamin B1) 500mg IV (give BEFORE any glucose). Banana bag is NOT adequate thiamine -need 500mg IV. |
| Hour 1 | 16 | Lorazepam (Ativan) 2mg IV. Replete Mg (MgSO₄ 2g IV), K⁺, PO₄. |
| Hour 2 | 14 | Lorazepam (Ativan) 1mg IV. Reassess -trending down, good sign. |
| Hour 4 | 10 | Lorazepam (Ativan) 1mg IV. |
| Hour 6 | 7 | Hold. Below threshold. Monitor q2h. |
| Hour 12 | 5 | Continue monitoring. Total lorazepam = 6mg in first 6h. |
Red flags to escalate: CIWA > 20 despite treatment → increase frequency/dose → consider phenobarbital load (130–260mg IV q15–30min). Seizure → lorazepam 4mg IV STAT (NOT phenytoin -doesn't work for withdrawal seizures). Hallucinations with clear sensorium = alcoholic hallucinosis (not DTs). DTs = altered sensorium + autonomic storm → ICU + aggressive benzos/phenobarbital.
When to use Chlordiazepoxide (Librium) instead: CIWA < 15, able to take PO, no liver disease, low risk for DTs → fixed taper 25–100mg PO q6h over 3–5 days. Smoother withdrawal due to long half-life. Floor patients only.
🧪 Workup
Workup
- CIWA-Ar score
- CBC, BMP, Mg, PO₄
- LFTs, INR, albumin
- Lipase
- Blood alcohol level
- CT head if AMS/focal deficit/head injury
💊 Medications
Medications
| Drug | Dose | Route | Notes |
|---|---|---|---|
| Lorazepam | 1-4mg IV q1h PRN | IV | CIWA≥8. Preferred liver disease. |
| Diazepam | 10-20mg IV | IV | Long-acting. Caution liver. |
| Chlordiazepoxide (Librium) | 25-100mg PO q6h taper | PO only | Mild-mod (CIWA<15). No IV form. Avoid liver disease. |
| Phenobarbital | 130-260mg IV | IV | Benzo-resistant |
| Thiamine | 500mg IV×3d | IV | BEFORE glucose |
| MgSO₄ | 2-4g IV | IV | Replace aggressively |
📋 On Rounds
Pimp Questions
What is the advantage of phenobarbital over benzodiazepines in severe AWS?
Phenobarbital acts at a different GABA-A binding site than benzodiazepines -it increases the duration of Cl⁻ channel opening (vs benzos which increase frequency). This provides more predictable, dose-dependent GABA agonism. Its 80–120h half-life creates a built-in self-taper. Front-loading phenobarbital reduces total benzo dose, ICU days, and intubation rates.
Why must you give thiamine before glucose?
Thiamine (B1) is a cofactor for pyruvate dehydrogenase and α-ketoglutarate dehydrogenase -essential for aerobic glucose metabolism. Giving glucose to a thiamine-depleted patient shunts all remaining thiamine into metabolism, acutely precipitating Wernicke encephalopathy (confusion, ophthalmoplegia, ataxia). If Wernicke is untreated, it progresses to Korsakoff syndrome (irreversible anterograde amnesia, confabulation). Always thiamine first.
When should you use Chlordiazepoxide (Librium) vs Lorazepam (Ativan) in alcohol withdrawal?
Chlordiazepoxide (Librium) is ideal for mild-moderate withdrawal (CIWA < 15) in patients who can take oral meds and are NOT at high risk for DTs/seizures. Its long half-life (24–48h) with active metabolites provides a smoother, self-tapering withdrawal. However: (1) No IV formulation → can't use in severe withdrawal, NPO, or vomiting, (2) Active metabolites accumulate in liver disease → avoid, (3) Oral only = floor patients only.
What are the risk factors for developing delirium tremens?
DTs develop in only 3-5% of alcohol withdrawal -but carry 5-15% mortality if untreated. Risk factors: (1) Prior DTs (strongest predictor -50% recurrence rate), (2) Prior withdrawal seizures, (3) Heavy daily alcohol use (> 8 drinks/day), (4) Prolonged drinking duration, (5) Concurrent illness (infection, surgery, trauma -any physiologic stress), (6) Older age, (7) Abnormal liver function, (8) High initial CIWA score (> 20).
What is the role of phenobarbital in alcohol withdrawal?
Phenobarbital is increasingly used as an alternative or adjunct to benzodiazepines for severe withdrawal. Advantages: longer half-life (80-120h, self-tapering), effective in benzo-resistant withdrawal, less cross-tolerance. Loading dose: 130-260 mg IV q15-30min titrated to effect. Rosenson, 2013 showed single-dose phenobarbital reduced ICU admissions.
Clinical Examples
📋 Case 1, Moderate Alcohol Withdrawal with CIWA Protocol
Patient: 48M with daily vodka use (1 pint/day x 15 years), admitted for cellulitis. Last drink 16 hours ago. Reports tremor, anxiety, nausea. No prior seizures or DTs.
Key findings: HR 108, BP 152/94, Temp 37.6°C, diaphoretic, bilateral hand tremor, mildly anxious but oriented. CIWA score: 18 (moderate). Magnesium 1.4, phosphorus 2.0, AST 180, ALT 95.
Management:
- CIWA-based symptom-triggered protocol: diazepam 10-20 mg PO q1h for CIWA ≥ 10 Saitz, 1994
- Symptom-triggered dosing is superior to fixed-schedule: less total benzo, shorter treatment
- Replete: magnesium sulfate 2g IV, thiamine 500 mg IV x 3 days (give BEFORE glucose), folate 1 mg, multivitamin
- Banana bag is inadequate: only contains 100 mg thiamine. Order high-dose thiamine separately
Teaching point: CIWA-based symptom-triggered therapy is the standard of care. Always give high-dose IV thiamine (500 mg) before any glucose-containing fluids. Banana bags contain inadequate thiamine for prophylaxis.
📋 Case 2, Delirium Tremens Refractory to Benzodiazepines
Patient: 55M with history of prior DTs and withdrawal seizures, admitted 48 hours ago with CIWA protocol. Now acutely agitated, hallucinating (seeing insects on walls), febrile, and tachycardic despite receiving diazepam 120 mg over past 6 hours.
Key findings: Temp 39.1°C, HR 138, BP 170/100, diaphoretic, globally confused, visual hallucinations, gross tremor. CIWA not assessable. CK 2,400 (rhabdomyolysis from agitation).
Management:
- ICU transfer: benzo-refractory DTs require ICU. Switch to IV midazolam or diazepam drip
- Add phenobarbital 130-260 mg IV q15-30min for benzo-resistant withdrawal Rosenson, 2013
- Dexmedetomidine drip as adjunct (reduces benzo requirement) -- NOT as monotherapy
- Aggressive IV hydration for rhabdomyolysis (target UOP 200-300 mL/hr), monitor CK, Cr, potassium
Teaching point: In DTs, benzodiazepine tolerance can be extreme (>1000 mg diazepam equivalents). Phenobarbital is the key second-line agent. Never use dexmedetomidine or propofol as monotherapy -- they do not prevent seizures.
Delirium Tremens is a medical emergency. Mortality 15-20% if untreated, < 5% with aggressive treatment. Do NOT undertreat - there is no maximum benzo dose for DTs. If standard doses fail, consider: propofol infusion (for intubated patients), phenobarbital loading, or dexmedetomidine adjunct. ICU admission mandatory. DTs peak at 48-96h after last drink but can occur up to 7 days later.
📋 Case 3, Alcohol Withdrawal Seizure
Patient: 39M brought by EMS after witnessed generalized tonic-clonic seizure at home. Wife reports he quit drinking 2 days ago (12+ beers daily). Seizure lasted ~90 seconds, now postictal.
Key findings: Postictal: drowsy, confused, HR 118, BP 148/92, Temp 37.8°C, tongue laceration. No focal deficits. Glucose 95. No history of epilepsy. Blood alcohol level 0. Last drink ~36 hours ago.
Management:
- Immediate: lorazepam 2-4 mg IV to prevent recurrent seizure (withdrawal seizures recur in ~25% within 6-12 hours)
- Start long-acting benzodiazepine: diazepam or chlordiazepoxide loading. Phenytoin is NOT effective for withdrawal seizures
- CT head if: first seizure, focal features, prolonged postictal state, head trauma, or anticoagulated
- HIGH risk for DTs: withdrawal seizure + heavy daily use. Admit to monitored bed, aggressive benzo protocol, CIWA q1h
Teaching point: Alcohol withdrawal seizures peak at 12-48 hours and are typically generalized tonic-clonic. Phenytoin does NOT prevent recurrent withdrawal seizures -- only benzodiazepines work. A withdrawal seizure is a major risk factor for progression to DTs (onset 48-96h).
Phenytoin does NOT work for withdrawal seizures. Alcohol withdrawal seizures are caused by GABA downregulation, not epileptic foci. Phenytoin blocks sodium channels but does not address the GABA deficit. Benzodiazepines are the ONLY first-line treatment for withdrawal seizures. If seizing: lorazepam 2-4 mg IV, repeat q5min as needed Rathlev, 1994.
📣 Sample Presentation
One-Liner
"Mr. O'Brien is a 48-year-old with daily vodka use (1 pint/day × 20 years) who last drank 18 hours ago, presenting with tremor, tachycardia, diaphoresis, and mild agitation. CIWA score 22."
Key Points to Cover on Rounds
CIWA 22 (moderate-severe). Symptom-triggered benzodiazepine protocol: lorazepam 2 mg IV given × 3 in first 6 hours. CIWA trending 22→18→14. No seizure, no hallucinations. Thiamine 500 mg IV daily × 3 days, then 100 mg PO (given BEFORE glucose). Folate 1 mg, MVI. Electrolytes: Mg 1.2 (repleted), K 3.4 (repleted), PO₄ 2.0 (repleted). Total benzos in 24h: 14 mg lorazepam-equivalents. Plan: continue CIWA protocol, watch for DTs (peak risk 48-72h), SW and addiction medicine consulted.
Monitoring
- CIWA q1-2h
- Vitals q1-4h
- Mg, K, PO₄ q12h
- Seizure precautions
- DT watch 48-72h
- Blood glucose
⚡ Summary
Summary
Understand the Mechanism
Chronic alcohol downregulates GABA receptors and upregulates NMDA receptors, so cessation leaves an unopposed excitatory state. That is why benzodiazepines work (they restore GABA tone) and why the syndrome escalates rather than plateaus if it is under-treated.
Know the Timeline
6 to 12 h: tremor, anxiety, sweating, tachycardia. 12 to 24 h: alcoholic hallucinosis. 24 to 48 h: withdrawal seizures. 48 to 96 h: delirium tremens. The timeline tells you what to watch for next, and a patient at 36 h is not out of the woods.
Hallucinosis Is Not DTs
Alcoholic hallucinosis has an intact sensorium: the patient knows where they are and often knows the hallucinations are not real. DTs have global confusion plus an autonomic storm. That distinction is the key one, because hallucinosis is not the emergency and DTs carry 15 to 20% mortality untreated.
Use Symptom-Triggered Dosing
Score CIWA-Ar every 1 to 2 h and dose to the score. This reduces total benzodiazepine exposure and ICU length of stay compared with fixed scheduled dosing (Saitz). CIWA is invalid in a patient who cannot communicate, including the intubated and the delirious, so use RASS-based or fixed protocols there instead.
Escalate Aggressively in Severe Withdrawal
CIWA above 18 means IV diazepam 10 to 20 mg every 5 to 15 min until controlled. Under-dosing is the commonest error: withdrawal that is chased rather than suppressed progresses to seizures and DTs. Front-loading with a long-acting agent gives a self-tapering effect through its active metabolites.
Add Phenobarbital When Benzodiazepines Fail
Above about 200 mg of diazepam without control means benzodiazepine-resistant withdrawal. Phenobarbital 130 to 260 mg IV works at a different site on the GABA receptor and increases channel opening duration rather than frequency, so it succeeds where more benzodiazepine will not. Its long half-life gives an inherent taper.
Choose the Benzodiazepine for the Liver
Diazepam and chlordiazepoxide are long-acting and self-tapering, and are preferred in most patients. Lorazepam in significant liver disease and in the elderly, because it is glucuronidated rather than oxidized and so does not accumulate. Avoid antipsychotics as monotherapy: they lower the seizure threshold and do not treat the underlying withdrawal.
Do Not Forget Thiamine and the Electrolytes
Give thiamine before any glucose, since a glucose load in a thiamine-deficient patient precipitates Wernicke encephalopathy. Replace magnesium, potassium and phosphate, and watch for refeeding syndrome. Look for the illness underneath: infection, pancreatitis, GI bleeding, subdural hematoma and hepatic encephalopathy all masquerade as, or coexist with, withdrawal, and starting medication for alcohol use disorder before discharge is the intervention that changes what happens next.
📄 One Pager
Text version
Addiction / ICU · One Pager
Alcohol Withdrawal
CIWA-driven benzos. Thiamine 500mg IV BEFORE glucose × 3 days. Watch for DTs at 48-72h. Seizures at 12-48h. Replete Mg/K/PO₄.
Timeline
6-12h: tremor, anxiety, tachycardia. 12-24h: hallucinations. 12-48h: seizures (brief GTCs). 48-72h: delirium tremens (mortality 5-15% if untreated).
Management
CIWA protocol: symptom-triggered lorazepam 1-2 mg IV q1h PRN. Thiamine 500 mg IV × 3 days BEFORE glucose. Folate 1 mg, MVI. Replete Mg²⁺, K⁺, PO₄. Benzo-resistant → phenobarbital.
DT Risk Factors
Prior DTs (#1 predictor), prior withdrawal seizures, heavy daily use, concurrent illness, older age, high initial CIWA > 20. DTs peak at 48-72h.
Key Drugs
Lorazepam1-4 mg IV q1h PRN (CIWA ≥ 8)
Thiamine500 mg IV × 3d → 100 PO
Phenobarbital130-260 mg IV (benzo-resistant)
Diazepam10-20 mg IV (long-acting option)
Pitfalls
- Glucose before thiamine (precipitates Wernicke)
- Phenytoin for alcohol withdrawal seizures (doesn't work)
- Banana bag = inadequate thiamine (only 100 mg)
- Under-dosing benzos in DTs
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