Ceftum and norflox were determined to have no interactions. It doesn't mean that there aren't any interactions. Always seek medical advice from a qualified professional. Proven connections between both the drugs are that Norfloxacin 400mg per day is a typical treatment to prevent spontaneous bacterial peritonitis (SBP) in individuals with liver cirrhosis. SBP can also be prevented by taking 750 mg of ceftum once a week. Furthermore, giving ciprofloxacin once a week is more convenient and less expensive.