How should a bupropion overdose be managed?

Management of Bupropion Overdose

Provide supportive care with close medical supervision and monitoring, as there is no specific antidote for bupropion overdose 1.

Immediate Assessment and Monitoring

The primary concern in bupropion overdose is seizure risk (occurring in approximately one-third of cases) and cardiovascular complications 1. Key clinical features to assess include:

• Neurological effects: Seizures, hallucinations, altered mental status, clonus, myoclonus, hyperreflexia, loss of consciousness 1
• Cardiovascular effects: Sinus tachycardia, QRS prolongation, conduction disturbances, arrhythmias, hypotension, cardiogenic shock 1, 2, 3
• Other complications: Fever, muscle rigidity, rhabdomyolysis, respiratory failure 1

Heart rate is a critical predictor: A maximum heart rate ≤104 bpm within the first 8 hours has a 100% negative predictive value for delayed adverse effects 4. All patients with delayed complications (occurring 14-28 hours post-ingestion) had tachycardia within 5 hours of presentation 4.

Specific Management Steps

1. Airway Protection and Respiratory Support

• Intubation may be required in approximately one-third of severe cases 2
• Monitor for respiratory depression, particularly with co-ingestions 1

2. Seizure Management

• Seizures are dose-dependent (occurring with ingestions ≥2.7g) and typically brief and self-limiting 5, 6
• Administer GABA-A agonists (benzodiazepines) as first-line treatment—the vast majority of ICU admissions receive these agents 2
• Multiple anti-seizure medications may be required for status epilepticus 7

3. Cardiovascular Support

• Monitor ECG for QRS prolongation and arrhythmias 1, 2
• Vasopressor support may be necessary for cardiogenic shock 3
• Consider intravenous lipid emulsion (ILE) therapy early in cases of cardiogenic shock with decreased left ventricular ejection fraction—case reports suggest hemodynamic improvement with ILE 3

4. Decontamination

• Contact Poison Control immediately (1-800-222-1222) 1
• Consider activated charcoal if presenting early, though gastric emptying is decreased in bupropion toxicity, increasing aspiration and perforation risk 8
• Multiple-dose activated charcoal is not routinely recommended due to these risks

5. Observation Period

• Minimum 8-hour observation for asymptomatic patients with heart rate ≤104 bpm and no tachycardia 4
• Extended 24-hour monitoring (typically ICU-level care) for patients with tachycardia, seizures, or other clinical signs of toxicity 2
• Delayed effects, though rare, can occur up to 28 hours post-ingestion 4

Critical Pitfalls to Avoid

• Do not assume early stability means safety: Delayed seizures and serotonin syndrome can occur days after ingestion 7
• Screen for co-ingestions: Multiple drug overdoses significantly worsen outcomes with fever, muscle rigidity, rhabdomyolysis, stupor, coma, and respiratory failure 1
• Do not discharge based solely on time: Use heart rate trends as the primary screening tool rather than arbitrary time cutoffs 4
• Monitor for rare complications: Non-cardiogenic pulmonary edema and serotonin syndrome have been reported, particularly in pediatric cases 7

Resource Utilization

Bupropion overdose requires significant healthcare resources, with median ICU/ED stay of 1.47 days per case and approximately 68.5 non-psychiatric bed-days per year at tertiary centers 2. Most patients require ICU admission, with outcomes generally favorable when appropriate supportive care is provided 6.

Prognosis

Although deaths have been reported with large ingestions (multiple uncontrolled seizures, bradycardia, cardiac failure, and cardiac arrest), most patients recover without sequelae with appropriate supportive care 1, 6.