Urinary Tract Infection Treatment Guidelines

First-Line Treatment Options

The World Health Organization recommends first-line options for uncomplicated lower UTIs, including nitrofurantoin, trimethoprim-sulfamethoxazole, and amoxicillin-clavulanic acid, based on local susceptibility patterns 1, 2, 3
Fosfomycin (3g single dose) is another appropriate option with minimal resistance 4
The WHO Expert Committee specifically removed amoxicillin from recommended options for UTIs in 2021 due to global resistance data showing 75% (range 45-100%) of E. coli urinary isolates were resistant to amoxicillin 1

For complicated UTIs with systemic symptoms, recommended options include amoxicillin plus an aminoglycoside (not amoxicillin alone) 5
A second-generation cephalosporin plus an aminoglycoside is also recommended 6
An intravenous third-generation cephalosporin is another option for complicated UTIs 5, 6
For pyelonephritis, recommended first-line options are ciprofloxacin (if local resistance <10%) or ceftriaxone/cefotaxime 7

Always obtain a urine culture before starting antibiotics for suspected UTIs, especially in complicated cases 3, 6
Local resistance patterns should guide empiric therapy choices 3, 4
Treatment duration should be tailored to the type of UTI, with 3-5 days for uncomplicated cystitis in women 4 and 7-14 days for complicated UTIs (14 days for men when prostatitis cannot be excluded) 5, 6

In children aged 2-24 months, amoxicillin-clavulanic acid (not amoxicillin alone) is recommended for empiric treatment 8
For complicated UTIs in children, amoxicillin may be used but only in combination with an aminoglycoside 8

Using amoxicillin empirically without knowledge of local resistance patterns 1
Failing to obtain urine cultures before initiating therapy in complicated cases 6
Not considering alternative diagnoses when symptoms persist despite appropriate therapy 3
Treating asymptomatic bacteriuria, which is not recommended except in pregnancy or before urologic procedures 3, 9