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Double-blind comparison of 3-day versus 7-day treatment with norfloxacin in symptomatic urinary tract infections. The Inter-Nordic Urinary Tract Infection Study Group.

The therapeutic efficacy and safety of norfloxacin 400 mg twice daily for 3 or 7 days was compared in a double-blind randomized multiclinic study including 485 female general practice patients with uncomplicated symptomatic lower urinary tract infections. 373 patients were considered valid for efficacy, 193 in the 3-day treatment group and 180 in the 7-day treatment group. The short-term efficacy (elimination of significant bacteriuria 3-13 days post-treatment) was 93.8% and 96.6% in the 3 and 7-day treatment groups, respectively, and the accumulated efficacy (elimination of significant bacteriuria 3 days post-treatment up until 45 days after the first dose) 81.3% and 91.7%, respectively (p less than 0.004). The median time to disappearance of symptoms was 3 days in both groups. Norfloxacin was well tolerated in both treatment groups.