Ciprofloxacin Resistance in Enterococcus faecalis UTI

Introduction to Ciprofloxacin Resistance

E. faecalis demonstrates 46-47% resistance to fluoroquinolones (ciprofloxacin and levofloxacin) in clinical isolates from UTI patients 1

The American College of Physicians recommends ampicillin or amoxicillin as the drug of choice for E. faecalis UTI, with high-dose ampicillin (18-30 g IV daily in divided doses) or amoxicillin 500 mg orally every 8 hours for 7 days achieving 88.1% clinical and 86% microbiological eradication rates 1
Amoxicillin-clavulanate should replace amoxicillin for beta-lactamase producing strains 1
Nitrofurantoin 100 mg orally every 6 hours for 7 days demonstrates excellent activity against E. faecalis with resistance rates below 6% and 100% susceptibility in some studies 1
Fosfomycin 3 g orally as a single dose is FDA-approved specifically for UTI caused by E. faecalis, with 94.4% susceptibility rates, making it appropriate for uncomplicated infections 1

Asymptomatic bacteriuria with E. faecalis does not routinely require treatment 1
Only treat when clinical signs of infection (dysuria, frequency, fever, flank pain) are present alongside positive culture 1
The Infectious Diseases Society of America recommends obtaining urine culture and susceptibility testing before initiating therapy, even for strains described as "pansensitive," as resistance patterns vary significantly by institution 1

The World Health Organization recommends not using ciprofloxacin empirically for suspected enterococcal UTI, as fluoroquinolones are reserved only for pyelonephritis/prostatitis where E. coli is the expected pathogen 2, 3