Cefepime IM Dose for UTI
For an adult with a urinary tract infection and normal renal function, administer cefepime 0.5 to 1 g intramuscularly every 12 hours for 7-10 days. 1
Dosing Specifics
The FDA-approved intramuscular dosing for UTI is clearly defined:
- Mild to moderate uncomplicated or complicated UTI (including pyelonephritis): 0.5-1 g IM every 12 hours 1
- Severe uncomplicated or complicated UTI (including pyelonephritis): 2 g IV every 12 hours (IM route not indicated for severe infections) 1
Important caveat: The intramuscular route is specifically indicated only for mild to moderate UTIs due to E. coli 1. For severe infections, Pseudomonas aeruginosa coverage, or other complicated scenarios, intravenous administration is required.
Clinical Context
The 2024 European Association of Urology guidelines recommend cefepime 1-2 g twice daily intravenously for uncomplicated pyelonephritis requiring hospitalization 2. However, for outpatient management of mild to moderate UTI where IM administration is appropriate, the lower dose range (0.5-1 g) is adequate.
Bioavailability: Cefepime demonstrates 82-100% bioavailability after intramuscular administration, with peak concentrations achieved in 1-1.6 hours 3. This makes IM dosing pharmacokinetically sound for appropriate cases.
Duration of Therapy
- Uncomplicated cystitis: 7 days 1
- Complicated UTI/pyelonephritis: 7-10 days 1
- Males (when prostatitis cannot be excluded): Consider extending to 14 days 2
Key Considerations
When NOT to use IM cefepime:
- Severe UTI or sepsis (requires IV route)
- Suspected Pseudomonas aeruginosa (requires 2 g IV every 8 hours) 1
- Organisms other than E. coli (IM route only FDA-approved for E. coli UTIs) 1
- Patients requiring hospitalization
Renal adjustment: The question specifies normal renal function, but if creatinine clearance is ≤60 mL/min, dose reduction is mandatory 1.