Alternative Prophylaxis in Female Recurrent Urinary Tract Infections

Inclusion Criteria: * Documented history of rUTI, defined as ≥ 3 episodes of (un)complicated UTI documented by urine culture with the isolation of ≥103 cfu/ml of an identified pathogen in the last year with clinical symptoms OR 2 episodes in the last 6 month Exclusion Criteria: * No informed consent * Concomitant UTI (\< 7 days prior to randomisation) * Ongoing antimicrobial prophylaxis (e.g. for rUTI or for any other reason like endocarditis, transplanted patients under immunosuppression) * Ongoing prophylactic strategy (e.g. immunoactive prophylaxis) * Documented underlying urogenital abnormality (e.g. significant post voiding residual volume (\>50 ml), urethral stricture, urethral diverticula, urinary stone, reflux, urinary neoplasia), urological device (e.g. catheter, ureteral stent) or symptomatic pelvic floor disorder (e.g. genital prolapse stage ≥ II) * Concomitant disease (i.e. renal insufficiency, diabetes mellitus, corticosteroid use) * Urogenital urological or gynecological surgery \< 6 weeks * Known allergy to the study medication * Use of spermicides or intrauterine device * Pregnancy