Best Oral Antibiotic for Uncomplicated Pansensitive Enterococcus faecalis UTI

First-Line Treatment Options

The American College of Physicians recommends ampicillin 500 mg orally every 8 hours or amoxicillin 500 mg orally every 8 hours as first-line therapy for uncomplicated E. faecalis UTIs that are pansensitive 1, 3
Nitrofurantoin 100 mg orally every 6 hours is an effective alternative with good in vitro activity against E. faecalis and low resistance rates 1, 4
Fosfomycin, a single 3 g oral dose, is FDA-approved specifically for E. faecalis UTIs and provides convenient single-dose therapy 1, 2

Confirm susceptibility testing is necessary to guide therapy, even though the strain is described as "pansensitive" 5
For patients without contraindications, ampicillin/amoxicillin is the first choice 5

The recommendation for ampicillin/amoxicillin is supported by guidelines that recognize it as the drug of choice for enterococcal infections, including uncomplicated UTIs, with high rates of clinical (88.1%) and microbiological (86%) eradication 1, 3
Fosfomycin has FDA approval specifically for E. faecalis UTIs and offers the convenience of single-dose therapy 1, 2

Avoid fluoroquinolones due to increasing resistance rates (47-46% for ciprofloxacin/levofloxacin) and FDA warnings about unfavorable risk-benefit ratios for uncomplicated UTIs 4
The typical duration of therapy is 7 days for ampicillin/amoxicillin, 7 days for nitrofurantoin, and single dose for fosfomycin 1, 4