Ertapenem Dosing
For adults with normal renal function, administer ertapenem 1 gram intravenously every 24 hours; for children 3 months to 12 years, give 15 mg/kg twice daily (not exceeding 1 g/day), and for adolescents ≥13 years, use the adult dose of 1 g daily. 1, 2
Adult Dosing
Standard Dosing (Normal Renal Function)
- 1 gram IV every 24 hours for patients with creatinine clearance >30 mL/min/1.73 m² 1, 2
- Infuse over 30 minutes 2
- Treatment duration varies by indication: 5-14 days for complicated intra-abdominal infections, 7-14 days for complicated skin/soft tissue infections, 10-14 days for community-acquired pneumonia and complicated UTI 1, 2
Renal Impairment Adjustments
Critical dosing modifications are required for severe renal dysfunction:
- Creatinine clearance >30 mL/min/1.73 m²: No adjustment needed, use standard 1 g daily 2, 3
- Creatinine clearance ≤30 mL/min/1.73 m²: Reduce to 500 mg IV every 24 hours 2, 3
- End-stage renal disease (CrCl ≤10 mL/min/1.73 m²): Use 500 mg IV every 24 hours 2, 3
Hemodialysis Considerations
Timing relative to dialysis is crucial:
- If ertapenem is given within 6 hours before hemodialysis: Administer a supplementary 150 mg dose after dialysis 2, 3
- If given ≥6 hours before hemodialysis: No supplementary dose needed 2, 3
- Approximately 30% of the dose is removed during a 4-hour hemodialysis session 3
Important safety caveat: The standard 500 mg daily dose in hemodialysis patients carries a 10% risk of neurotoxicity, particularly in elderly males with dementia or concurrent use of other β-lactams, aminoglycosides, or fluoroquinolones 4, 5. Monitor closely for seizures and altered mental status.
Pediatric Dosing
Age-Based Dosing Strategy
Children 3 months to 12 years:
- 15 mg/kg IV twice daily (maximum 1 g/day total) 1, 2
- Administer every 12 hours 1, 2
- This twice-daily regimen is necessary because children <12 years have approximately 2-fold higher plasma clearance compared to adults 2, 6
Adolescents ≥13 years:
- 1 gram IV every 24 hours (adult dosing) 1, 2
- Pharmacokinetic parameters in this age group are comparable to adults 2
Pediatric Renal Impairment
No established dosing recommendations exist for pediatric patients with renal impairment 2. However, modeling studies suggest dose reductions may be needed: 13 mg/kg twice daily for mild renal impairment, 9 mg/kg twice daily for moderate, 6 mg/kg twice daily for severe, and 5 mg/kg twice daily for end-stage renal disease 7. These remain investigational and require clinical judgment.
Administration Considerations
Critical Preparation Requirements
- DO NOT mix or co-infuse with other medications 2
- DO NOT use diluents containing dextrose 2
- For IV administration: Reconstitute 1 g vial with 10 mL of 0.9% sodium chloride or water for injection, then dilute in 50 mL of 0.9% sodium chloride 2
- Complete infusion within 6 hours of reconstitution 2
Intramuscular Option (Adults Only)
- IM administration may be used as alternative for up to 7 days (vs. 14 days for IV) 2
- Reconstitute with 3.2 mL of 1% lidocaine HCl (without epinephrine) 2
- Use within 1 hour of preparation 2
- Inject deep into large muscle mass 2
Special Populations
Hepatic Impairment
- No dose adjustment recommendations available 2
- Ertapenem undergoes minimal hepatic metabolism (only ~10% fecal excretion), so hepatic dysfunction likely has limited impact 2, 8