Vancomycin Dosing for ESRD on Dialysis
For a 145-pound (66 kg) patient with ESRD on hemodialysis, administer a loading dose of 1,000 mg followed by maintenance doses of 500 mg given during the last hour of each dialysis session (typically 3 times weekly).
Dosing Algorithm
Loading Dose
- 1,000 mg for patients <70 kg (this patient is 66 kg)
- Administer during the last 60 minutes of the first dialysis session 1
- This achieves an initial dose of approximately 15 mg/kg, which is the minimum recommended even in renal impairment 1
Maintenance Dosing
- 500 mg administered during the last hour of each subsequent dialysis session
- Given 3 times weekly with dialysis treatments 2
- For functionally anephric patients (ESRD on dialysis), the dose required to maintain stable concentrations is 1.9 mg/kg/24 hours 1
Weight-Based Stratification
Recent evidence supports a more refined weight-based approach 3, 2:
- 50-69 kg: 1,000 mg loading dose → 500 mg maintenance
- 70-89 kg: 1,250-1,500 mg loading dose → 750 mg maintenance
- 90-110 kg: 1,500-2,000 mg loading dose → 1,000 mg maintenance
Your patient at 66 kg falls into the first category.
Administration Specifics
- Infuse during the last 60-90 minutes of dialysis to prevent vascular damage and preserve vascular access 4
- Use high-flux dialysis if available
- Infusion rate should not exceed 10 mg/min 1
- Dilute each dose in at least 100 mL of compatible solution (200 mL for 1 gram doses) 1
Therapeutic Monitoring
Target Concentrations
- Pre-dialysis trough: 15-20 mg/L for serious infections (bacteremia, endocarditis, osteomyelitis, pneumonia) 5
- Pre-dialysis trough: ≥10 mg/L minimum to prevent resistance development 5
- Target AUC24-48h/MIC ≥400 for optimal clinical outcomes in dialysis patients 6
Monitoring Schedule
- Measure trough concentration before the second dialysis session (pre-dialysis level after loading dose) 6, 2
- Pre-dialysis concentrations correlate strongly with AUC (R² = 0.921) and serve as a reliable surrogate 6
- For serious infections, target pre-dialysis concentration/MIC ≥16.8 6
- Continue monitoring before each dialysis session until stable therapeutic levels achieved
Critical Considerations
Common Pitfalls
- Underdosing: The standard 500 mg maintenance dose may be suboptimal in up to one-third of patients, particularly those >70 kg 2
- Timing errors: Administering vancomycin too early in dialysis results in excessive drug removal
- Dosing interval confusion: The 48-hour interval between dialysis sessions is standard, but 72-hour intervals (weekend gaps) require dose adjustment 7
Dosing Interval Adjustments
- 48-hour intervals (weekday dialysis): Standard 500 mg maintenance dose
- 72-hour intervals (weekend gap): Consider increasing maintenance dose to 750 mg to prevent subtherapeutic levels 7
Nephrotoxicity Monitoring
While the patient is already on dialysis, monitor for:
- Concurrent nephrotoxic agents that increase risk 5
- Cutaneous reactions (rare vasculitis can occur, particularly with renal impairment) 8
- Thrombocytopenia and eosinophilia as early warning signs 8
Dose Adjustments Based on Levels
If pre-dialysis trough is:
- <10 mg/L: Increase maintenance dose by 250 mg
- 10-20 mg/L: Continue current regimen
- >20 mg/L: Decrease maintenance dose by 250 mg or extend interval
The FDA label notes that for anuria, 1,000 mg every 7-10 days has been used historically 1, but this approach is outdated and does not achieve the aggressive targets needed for serious MRSA infections based on current guidelines 5.
This protocol achieves therapeutic pre-dialysis troughs of 10-20 mg/L in 76.9% of patients after the loading dose and 65.5-89.7% at steady state 2.