How should I manage a 30-year-old female with alcohol withdrawal who received lithium and lorazepam, now over‑sedated with episodes of hypotension, normal renal function, low calcium, metabolic acidosis, low albumin, and a blood alcohol level of 103 mg/dL?

Immediate Management of Benzodiazepine Over-Sedation with Metabolic Complications

Stop all sedatives immediately and provide supportive care with airway protection, fluid resuscitation for hypotension, and correction of metabolic abnormalities—do NOT use flumazenil given the risk of precipitating withdrawal seizures in this patient with alcohol withdrawal who received multiple doses of lorazepam. 1

Critical Assessment and Stabilization

Airway and Respiratory Status

• Assess airway patency and respiratory drive immediately. Benzodiazepines cause respiratory depression through loss of protective airway reflexes, particularly when combined with alcohol (blood alcohol 103 mg/dL present). 1, 2
• If respiratory compromise exists, establish airway control with bag-mask ventilation or endotracheal intubation as needed
• Monitor oxygen saturation and provide supplemental oxygen

Hemodynamic Management

• Continue fluid resuscitation cautiously for hypotension episodes, but recognize the patient has already received 5L over 8 hours
• Benzodiazepines cause systemic hypotension, especially in critically ill patients with baseline cardiovascular instability 2
• Monitor for fluid overload given the large volume already administered

Address Metabolic Derangements

Propylene Glycol Toxicity (Critical Concern)

Your patient likely has propylene glycol toxicity from IV lorazepam, evidenced by metabolic acidosis (CO2 16.0) after receiving multiple IV doses. 2

• Parenteral lorazepam contains propylene glycol as a diluent, which causes metabolic acidosis and acute kidney injury 2
• Toxicity can occur with total daily IV doses as low as 1 mg/kg 2
• Calculate osmolal gap immediately: An osmol gap >10-12 mOsm/L suggests significant propylene glycol accumulation 2
• Monitor serum osmolality, anion gap, and lactate levels serially

Hypocalcemia

• Correct calcium to 8.5-9.0 mg/dL (current calcium 7.0 is critically low, though correct for albumin 2.9)
• Corrected calcium = measured calcium + 0.8 × (4.0 - albumin)
• Corrected calcium ≈ 7.9 mg/dL—still low
• Administer IV calcium gluconate 1-2 grams slowly

Metabolic Acidosis

• CO2 of 16.0 indicates significant metabolic acidosis
• This is likely multifactorial: propylene glycol toxicity from lorazepam 3, 4, alcohol-associated lactic acidosis 5, and possible tissue hypoperfusion from hypotensive episodes
• Check arterial blood gas, lactate, and calculate anion gap
• If propylene glycol toxicity confirmed (high osmolal gap), consider fomepizole and renal replacement therapy if severe 4

Hypoalbuminemia

• Albumin 2.9 suggests chronic malnutrition/liver disease common in alcohol use disorder
• Affects calcium interpretation and drug protein binding

Lithium Management (Critical Error)

Lithium should NEVER have been administered in this clinical scenario. 6

• Lithium is contraindicated in patients with dehydration, sodium depletion, and those receiving large fluid volumes 6
• This patient received 5L fluids with potential sodium shifts, creating high risk for lithium toxicity
• Check lithium level immediately and monitor for neurotoxicity (tremor, confusion, ataxia, seizures)
• Lithium toxicity can occur even with subtherapeutic levels in the setting of tissue stores and altered elimination 7
• If lithium level elevated or neurologic symptoms develop, initiate hemodialysis 7
• Lithium is NOT indicated for alcohol withdrawal—this was an inappropriate medication choice

Alcohol Withdrawal Management Going Forward

Benzodiazepine Selection

If further sedation needed for alcohol withdrawal, use lorazepam cautiously given hepatic dysfunction (low albumin, likely underlying liver disease), but AVOID IV formulation due to propylene glycol. 8

• Lorazepam has less hepatic metabolism dependence than other benzodiazepines 8
• Switch to oral lorazepam or consider phenobarbital as alternative 9, 10
• Use symptom-triggered dosing based on CIWA-Ar scores rather than fixed dosing to avoid over-sedation 8, 9

Avoid Flumazenil

Do NOT administer flumazenil despite over-sedation. 1, 2

• Flumazenil precipitates refractory benzodiazepine withdrawal and seizures in patients with benzodiazepine tolerance 1
• This patient received multiple lorazepam doses and has alcohol withdrawal—both create seizure risk
• Flumazenil may not fully reverse respiratory depression in mixed overdoses (alcohol + benzodiazepines) 1

Supportive Care Essentials

• Thiamine 500 mg IV before any glucose administration to prevent Wernicke's encephalopathy 10
• Correct glucose (72 mg/dL is low-normal, trending toward hypoglycemia)
• Replete magnesium and phosphate (common in alcohol use disorder)
• Monitor potassium closely with fluid shifts

Monitoring and Disposition

• ICU-level monitoring required given over-sedation, metabolic acidosis, hypotension episodes, and potential propylene glycol toxicity 10
• Serial neurologic assessments for both benzodiazepine effects and lithium neurotoxicity
• Continuous cardiac monitoring
• Frequent metabolic panels (every 4-6 hours initially)
• Urine output monitoring given renal concerns with propylene glycol

Key Pitfalls to Avoid

1. Never use lithium for alcohol withdrawal—it has no role and significant toxicity risk 6
2. Recognize propylene glycol toxicity early with high-dose IV lorazepam 3, 4
3. Do not use flumazenil in withdrawal patients or those with seizure risk 1, 2
4. Avoid excessive IV lorazepam—switch to oral or alternative agents 8
5. Always give thiamine before glucose in alcohol use disorder 10