Pharmaceutisch Weekblad

, Volume 12, Issue 5, pp 182–183 | Cite as

Decreased ciprofloxacin absorption with concomitant administration of ferrous fumarate

  • J. R. B. J. Brouwers
  • H. J. Van der Kam
  • J. Sijtsma
  • J. H. Proost


The effect of ferrous fumarate on the relative bioavailability of ciprofloxacin after a single 500 mg oral dose of ciprofloxacin was studied in eight healthy males. Blood samples were collected at regular intervals 0–24 h post-dose. Urine was collected during 24 h to determine the cumulative urine excretion of ciprofloxacin. Ciprofloxacin concentrations in serum and urine were determined by high pressure liquid chromatography. Mean area under the serum concentration—time curve decreased significantly (P<0.001) after ciprofloxacin was taken with 200 mg ferrous fumarate. The relative bioavailability was 30% when ciprofloxacin was given with ferrous fumarate. The maximum blood level decreased from 2.1±0.9 (control) to 0.6±0.2 mg/l (with ferrous fumarate). Further studies are needed to determine if chronic treatment with ferrous fumarate further decreases the relative bioavailability. For the moment administration of ciprofloxacin with ferrous fumarate should therefore be avoided.


Absorption Ciprofloxacin Ferrous fumarate 


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Copyright information

© Royal Dutch Association for Advancement of Pharmacy 1990

Authors and Affiliations

  • J. R. B. J. Brouwers
    • 1
  • H. J. Van der Kam
    • 1
  • J. Sijtsma
    • 1
  • J. H. Proost
    • 2
  1. 1.Department of Clinical Pharmacy and PharmacokineticsGeneral Hospital De TjongerschansMA Heerenveenthe Netherlands
  2. 2.University Centre for Pharmacy, Department of Pharmacology and TherapeuticsUniversity of GroningenAW Groningenthe Netherlands

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