Cefepime Dosage for Wound Infection Caused by Enterobacter
For an adult with normal renal function and a wound infection caused by Enterobacter, administer cefepime 2 g IV every 8-12 hours.
Recommended Dosing Regimen
Based on FDA labeling and clinical guidelines, the standard dosing for Enterobacter infections is:
- Cefepime 2 g IV every 8 hours for moderate to severe infections 1
- Cefepime 2 g IV every 12 hours may be acceptable for less severe wound infections 2
The every 8-hour regimen is preferred because it maximizes the time that free drug concentrations remain above the MIC (fT>MIC), which is the pharmacodynamic parameter that best predicts beta-lactam efficacy 3.
Duration of Therapy
- 7-10 days is the typical duration for complicated skin and soft tissue infections 2, 4
- Adjust based on clinical response, source control adequacy, and resolution of signs of infection
Critical Considerations for Enterobacter
Enterobacter species are particularly concerning due to their ability to hyperproduce AmpC beta-lactamase, which can lead to treatment failure even when initial susceptibility testing shows susceptibility 5, 6. Key points:
- Cefepime demonstrates 10% resistance rates in E. cloacae complex, higher than in other Enterobacteriaceae 6
- The inoculum effect can significantly reduce cefepime activity when bacterial loads are high, with MICs increasing 8-fold or more in 61.3% of isolates 5
- For infections with high bacterial burden or MICs of 4-8 μg/mL (susceptible dose-dependent category), consider the higher frequency dosing (every 8 hours) rather than every 12 hours 7
Pharmacodynamic Targets
To optimize outcomes, cefepime should achieve:
- fT>MIC of at least 60-70% of the dosing interval 3
- For Enterobacteriaceae with MICs ≤2 μg/mL, standard dosing achieves this target in >80% of patients 8
- For organisms with MICs of 4-8 μg/mL, the 2 g every 8-hour regimen is necessary to maintain adequate exposure 7
Renal Function Adjustments
If creatinine clearance is <60 mL/min, dose adjustment is mandatory as cefepime is 85% renally eliminated 1:
- CrCl 30-60 mL/min: 2 g every 12-24 hours
- CrCl 11-29 mL/min: 2 g every 24 hours
- CrCl ≤10 mL/min: 1 g every 24 hours
When to Consider Alternatives
Consider switching from cefepime if:
- MIC is >8 μg/mL (resistant by CLSI criteria)
- Clinical failure after 48-72 hours of appropriate therapy
- Carbapenem resistance is documented - then use ceftazidime/avibactam, meropenem/vaborbactam, or imipenem/relebactam 9
- High bacterial inoculum with documented AmpC hyperproduction 5
Combination Therapy
Monotherapy with cefepime is appropriate for most Enterobacter wound infections when the organism is susceptible 2. Adding an aminoglycoside is not routinely necessary for wound infections, unlike pneumonia or bacteremia where combination therapy may be considered for severe cases 4.
The 2 g every 8-hour regimen provides the best balance of efficacy and safety for treating Enterobacter wound infections in adults with normal renal function, with dose adjustments required based on renal function and clinical response.