Prophylactic Antibiotic Recommendations for Recurrent UTIs

Diagnostic Considerations

A negative urine dipstick does not rule out recurrent UTIs, especially between active infections 1
Recurrent UTIs are defined as ≥3 UTIs per year or ≥2 UTIs in the last 6 months 3
Confirm diagnosis with urine culture during symptomatic episodes, not during asymptomatic periods 4
Patients requiring hospitalization for UTIs should be considered to have complicated or severe infections 2

For postmenopausal women: vaginal estrogen replacement is recommended (strong recommendation) 5
Immunoactive prophylaxis products are recommended (strong recommendation) 6
Methenamine hippurate is recommended for women without urinary tract abnormalities (strong recommendation) 7
Increased fluid intake is recommended (weak recommendation but minimal risk) 8
Consider cranberry products (weak recommendation) 4
Consider probiotics with proven efficacy (weak recommendation) 6
First-line option: Trimethoprim-sulfamethoxazole 160/800 mg three times weekly 4
Alternative options: Nitrofurantoin 50-100 mg daily (avoid in renal impairment) 4, 9
Alternative options: Fosfomycin 3g every 10 days 9
Alternative options: Cephalexin 250 mg daily 4

For UTIs associated with sexual activity: postcoital prophylaxis with TMP-SMX 160/800 mg or nitrofurantoin 50-100 mg taken within 2 hours after intercourse 10, 4
For patients with good compliance: self-administered short-term therapy at onset of symptoms 2
Duration of prophylaxis typically ranges from 6-12 months 9

Monitor for adverse effects of TMP-SMX including rash, gastrointestinal disturbances 9
Avoid TMP-SMX in first and last trimesters of pregnancy 3
Nitrofurantoin has rare but serious risks of pulmonary and hepatic toxicity (0.001% and 0.0003% respectively) 9
Rotating antibiotics every 3 months may help prevent development of resistance 10
Avoid treating asymptomatic bacteriuria as this increases antibiotic resistance 10

Periodic reassessment of prophylaxis effectiveness and adverse effects 9
Consider urine culture if symptoms recur during prophylaxis 1
Do not perform routine post-treatment urinalysis or cultures in asymptomatic patients 3