The best replacement for norfloxacin is ciprofloxacin.

The best alternatives to norfloxacin are rated as following:
★★★★★  ciprofloxacin
★★★  levofloxacin
★★  nitrofurantoin
★★  ofloxacin
★  moxifloxacin

Your alternative for norfloxacin is not listed? Suggest!
Speaking about norfloxacin, one probably shouldn't forget about tinidazole.

Other search terms related to norfloxacin and their ratings are:

★★★★★ tinidazole
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Google Trends

Scale is based on the average worldwide traffic of norfloxacin in all years. Click on graph for more.