Cefiderocol Dosing Based on Renal Function
For adults with normal renal function (CrCL 60-119 mL/min), administer cefiderocol 2 grams intravenously every 8 hours as a 3-hour infusion. 1
Standard Dosing Algorithm
For CrCL ≥120 mL/min (Augmented Renal Clearance)
- Dose: 2 grams IV every 6 hours (3-hour infusion)
- This more frequent regimen is necessary because increased renal clearance reduces drug exposure 1, 2
For CrCL 60-119 mL/min (Normal Function)
- Dose: 2 grams IV every 8 hours (3-hour infusion)
- This is the standard therapeutic regimen 1
For CrCL 30-59 mL/min (Moderate Impairment)
- Dose: 1.5 grams IV every 8 hours (3-hour infusion)
- Cefiderocol AUC increases 2.35-fold in this range 1
For CrCL 15-29 mL/min (Severe Impairment)
- Dose: 1 gram IV every 8 hours (3-hour infusion)
- Cefiderocol AUC increases 3.21-fold in this range 1
For CrCL <15 mL/min (End-Stage Renal Disease)
- Dose: 0.75 grams IV every 12 hours (3-hour infusion)
- Cefiderocol AUC increases 4.69-fold at this level 1
For Patients on Hemodialysis
- Administer dose after each dialysis session
- Approximately 60% of cefiderocol is removed during a 3-4 hour hemodialysis session 1
For Patients on Continuous Renal Replacement Therapy (CRRT)
- Dosing is based on effluent flow rate (the primary determinant of clearance)
- Use effluent flow rate-based recommendations to achieve exposures similar to 2 grams every 8 hours in non-CRRT patients 1
- Specific doses should follow Table 2 in the FDA label based on CVVH or CVVHD mode and flow rates 1
Critical Pharmacokinetic Considerations
The 3-hour infusion is essential, not optional. Prolonged infusion increases the percentage of time that free drug concentrations exceed the MIC, which is the key pharmacodynamic parameter for cefiderocol efficacy 1, 2. The target is ≥75% fT>MIC, ideally approaching 100% for optimal bactericidal activity 3, 4.
Cefiderocol is primarily renally excreted (90.6% unchanged in urine), making renal function the most critical covariate for dosing 1. The drug has minimal metabolism (<10%) and a half-life of 2-3 hours 1.
Common Pitfalls to Avoid
Do not use 1-hour infusions: Studies demonstrate that 3-hour infusions provide superior antibacterial activity compared to 1-hour infusions by maintaining drug concentrations above the MIC for longer periods 1
Do not overlook augmented renal clearance: Critically ill patients with CrCL >120 mL/min require more frequent dosing (every 6 hours instead of every 8 hours) to maintain adequate exposure 1, 2
Calculate creatinine clearance, not just eGFR: While both correlate with cefiderocol clearance, dosing adjustments are specifically based on CrCL measurements 1, 4
Monitor for dose accumulation in renal impairment: The AUC increases substantially as renal function declines, necessitating both dose reduction and potentially extended intervals 1