Norfloxacin works by preventing the bacterial cells from dividing and repairing, thereby killing the bacteria. Tinidazole kills parasites and anaerobic bacteria that cause infections by damaging their DNA. Together, they treat your infection effectively. Norfloxacin and Tinidazolet is used to treat diarrhea and dysentry caused due to infection. They work by killing the harmful microorganisms that cause infection. Together they help to treat infection more effectively.