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“The AUC of norfloxacin was reduced by 73% (P < 0.001) and its peak plasma concentration by 75% (P < 0.01) by concomitant ingestion of ferrous sulphate.”
“We recommend that norfloxacin and ciprofloxacin should not be taken together with ferrous sulphate.”
British journal of clinical pharmacology • 1994 | View Paper
“Commonly used doses of ferrous sulphate , zinc sulphate, aluminium hydroxide and magnesium hydroxide reduced the 24 h urinary excretion of norfloxacin by 50 to 90%.”