Maximum D50 Infusion Rate
For acute hypoglycemia treatment in adults, administer D50 slowly at 10-25 grams (20-50 mL of 50% dextrose) as a single bolus dose, not as a continuous hourly infusion. 1
Key Administration Principles
Bolus Dosing (Preferred Method)
- The FDA-approved dosing for insulin-induced hypoglycemia is 10-25 grams of dextrose (20-50 mL of 50% dextrose) given as a slow intravenous injection 1
- This should be administered as a single bolus, not as a continuous infusion 1
- Repeated doses and supportive treatment may be required in severe cases 1
Maximum Infusion Rate (When Continuous Infusion is Used)
- The maximum rate at which dextrose can be infused without producing glycosuria is 0.5 g/kg/hour 1
- For a 100 kg adult, this translates to approximately 50 grams per hour maximum
- About 95% of dextrose is retained when infused at a rate of 0.8 g/kg/hour 1
Titrated Approach for Hypoglycemia
- Modern evidence supports administering 10-20 grams of IV dextrose initially, which is lower than traditional dosing methods 2
- This titrated approach corrected blood glucose into target range in 98% of patients within 30 minutes 2
- Administer 5-gram aliquots of dextrose repeated every minute to avoid overcorrection and excessive hyperglycemia 2
Critical Safety Considerations
Vein Irritation
- D50W is irritating to veins; dilution to 25% dextrose is desirable 3
- For peripheral administration, injection should be made slowly 1
Complications of Rapid Administration
- Rapid and repeated administration of 50% dextrose has been associated with cardiac arrest and hyperkalemia 2
- The rate of administration is important for patient safety 2
Monitoring Requirements
- A blood glucose specimen should be obtained before injecting dextrose 1
- In emergencies, dextrose should be administered promptly without awaiting test results 1
- Glucose levels should be monitored to guide repeat dosing 1
Pediatric Dosing Context
- In pediatric patients, the dose is 0.5-1.0 g/kg (1-2 mL/kg of D50W) 3
- This provides context that adult dosing of 10-25 grams represents approximately 0.1-0.25 g/kg for a 100 kg patient
Clinical Pitfall
The question asks about "hourly infusion," but D50 is typically not given as a continuous hourly infusion for hypoglycemia. It is administered as a bolus, with lower concentration dextrose solutions (D10W or D5W) used for maintenance infusions if needed. When continuous dextrose is required, the maximum safe rate is 0.5 g/kg/hour to avoid glycosuria 1, but this should utilize lower concentration solutions rather than D50.