Amoxicillin Coverage of E. coli

Key Resistance Data

The World Health Organization recommends against using amoxicillin alone for empiric treatment of E. coli infections due to high resistance rates, with a median of 75% of E. coli urinary isolates resistant to amoxicillin globally 1
The WHO Expert Committee removed amoxicillin from recommended treatment options for urinary tract infections in 2021 after reviewing global surveillance data showing a median 75% resistance among E. coli urinary isolates (range 45-100% across 22 countries) 1

For uncomplicated lower UTIs, the American College of Clinical Pharmacy recommends amoxicillin-clavulanate (first-choice), nitrofurantoin, or trimethoprim-sulfamethoxazole 1
For pyelonephritis (mild-moderate), the Infectious Diseases Society of America recommends ciprofloxacin (if local resistance <10%) 2 or ceftriaxone or cefotaxime 1

Amoxicillin-clavulanate maintains high susceptibility rates among E. coli urinary isolates 1
The use of amoxicillin empirically for suspected E. coli infections risks treatment failure in 75% of cases and promotes further resistance development 1