Management of Vomiting Due to Digoxin
For vomiting caused by digoxin toxicity, immediately discontinue digoxin and assess for life-threatening manifestations (ventricular arrhythmias, progressive bradycardia, heart block, or hyperkalemia >5.5 mmol/L), which require urgent administration of digoxin-specific antibody fragments (digoxin-Fab). 12
Initial Assessment and Stabilization
When a patient presents with vomiting from digoxin, you must rapidly determine whether this represents:
- Simple gastrointestinal toxicity (vomiting alone, stable cardiac rhythm)
- Life-threatening toxicity requiring immediate antidote
Stop digoxin immediately in all cases 22. The vomiting itself may resolve with simple drug withdrawal, but you must rule out more serious toxicity.
Determine Severity
Check the following immediately:
- ECG for ventricular tachycardia, ventricular fibrillation, progressive bradyarrhythmias, or heart block
- Serum potassium (hyperkalemia >5.5 mmol/L indicates severe toxicity)
- Digoxin level if available (though treatment should not be delayed waiting for results)
- Timing and amount of ingestion (>10 mg in adults or >4 mg in children suggests massive overdose) 22
Treatment Algorithm
For Life-Threatening Toxicity (Any of the Following):
Administer digoxin-Fab immediately 122:
- Ventricular tachycardia or fibrillation
- Progressive bradyarrhythmias or heart block
- Serum potassium >5.5 mmol/L
- Digoxin level >10 ng/mL
- Ingestion >10 mg (adult) or >4 mg (child)
The 2023 AHA guidelines give digoxin-Fab a Class 1 (strong) recommendation with B-NR level of evidence for digoxin/digitoxin poisoning, with response rates of 50-90% and dysrhythmia resolution typically within 30-45 minutes 1.
For Symptomatic Bradycardia:
It may be reasonable to use atropine as a temporizing measure while preparing digoxin-Fab 12. However, do not rely on atropine alone for definitive management if toxicity is severe.
For Acute Ingestion (Within 2 Hours):
If the patient is alert and cooperative 22:
- Activated charcoal (strongly recommended to prevent absorption and bind digoxin during enterohepatic recirculation) 34
- Consider gastric lavage if within 30 minutes of presentation 2
Critical caveat: Do NOT induce vomiting or pass gastric tube if the patient is obtunded or already showing toxic manifestations, as vagal stimulation can worsen digoxin-related arrhythmias 2.
Electrolyte Management:
Maintain serum potassium between 4.0-5.5 mmol/L 22:
- If hypokalemic with ventricular arrhythmias: Cautiously replace potassium (oral preferred; IV only if urgent) while monitoring ECG for peaked T waves
- If hyperkalemic from massive overdose: DO NOT give potassium supplements - this is hazardous 2. Treat with digoxin-Fab as primary therapy; glucose/insulin may be needed if hyperkalemia is immediately life-threatening
Important pitfall: Potassium salts are dangerous in patients with bradycardia or heart block unless primarily related to supraventricular tachycardia 22.
Supportive Care
- Correct hypomagnesemia if present 2
- Monitor cardiac rhythm continuously
- Address any contributing factors (renal dysfunction, drug interactions, concurrent medications) 2
What NOT to Do
Do not use hemodialysis, hemofiltration, hemoperfusion, or plasmapheresis - these have a Class 3 (no benefit) recommendation from the 2023 AHA guidelines 1. Digoxin has a large volume of distribution that makes these modalities ineffective.
Monitoring After Treatment
Continue monitoring for rebound toxicity after digoxin-Fab administration, though this risk is small 5. Before restarting digoxin, reassess the original indication and identify why toxicity occurred 56.