Trial workflow. Screening and enrolment procedures at inclusion Inclusion criteria: women with typical symptoms of UTI (dysuria and/or frequency). Exclusion criteria: any signs indicating a complicated UTI (i.e. fever, back pain), any conditions that may lead to complicated infections (i.e. pregnancy, diabetes, renal diseases, urinary tract abnormalities or past urinary surgery, urine catheterization, immunosuppressive therapy, other serious diseases, cancer), current use of antibiotics or non-steroidal anti-inflammatory drugs; history of gastrointestinal ulcers; epilepsy, allergies or other contraindications for trial drugs; inability to understand the trial information or to give informed consent.