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Antimicrobial Agents and Chemotherapy, July 2003, p. 2158-2160, Vol. 47, No. 7
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.7.2158-2160.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Effect of Calcium Carbonate on Bioavailability of Orally Administered Gemifloxacin

M. W. Pletz,1 P. Petzold,1 A. Allen,2 O. Burkhardt,1 and H. Lode1*

Department of Chest and Infectious Diseases, City Hospital E. v. Behring, Free University of Berlin, Germany,1 Clinical Pharmacokinetics Department, GlaxoSmithKline Laboratories, Greenford, Middlesex, United Kingdom2

Received 17 January 2003/ Returned for modification 3 March 2003/ Accepted 1 April 2003

We investigated the effect of calcium carbonate on the oral bioavailability of gemifloxacin. Gemifloxacin was administered alone, 2 h before, simultaneously, or 2 h after calcium carbonate in 16 volunteers. Data for 320 mg of gemifloxacin alone were as follows: maximum concentration of drug in serum (Cmax),13 µg/ml; half-life, 7.33 h; and area under the concentration-time curve from 0 h to infinity (AUC{infty}), 6.79 µg · h/ml. Only simultaneous coadministration of calcium carbonate reduced Cmax (-17%) and AUC{infty} (-21%) significantly.


* Corresponding author. Mailing address: Department of Chest and Infectious Diseases, Zentralklinik E. v. Behring/Dept. Lungenklinik Heckeskorn (Academic Teaching Hospital of FU Berlin), Zum Heckeshorn 33, 14109 Berlin. Phone: 49 30 80022222. Fax: 49 30 80022623. E-mail: haloheck{at}zedat.fu-berlin.de.


Antimicrobial Agents and Chemotherapy, July 2003, p. 2158-2160, Vol. 47, No. 7
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.7.2158-2160.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.