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Antimicrobial Agents and Chemotherapy, July 2003, p. 2351-2353, Vol. 47, No. 7
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.7.2351-2353.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Intra- and Interindividual Variabilities of Valacyclovir Oral Bioavailability and Effect of Coadministration of an hPEPT1 Inhibitor

Dana D. Phan,1 Peter Chin-Hong,2 Emil T. Lin,1 Pascale Anderle,1,{dagger} Wolfgang Sadee,1,{ddagger} and B. Joseph Guglielmo1*

Schools of Pharmacy,1 Medicine, University of California, San Francisco, California2

Received 22 November 2002/ Returned for modification 17 March 2003/ Accepted 24 April 2003

Variability in valacyclovir bioavailability and the potential for cephalexin-valacyclovir interaction were evaluated. The intraindividual acyclovir area under the concentration-time curve (AUC) varied minimally, whereas interindividual differences were substantial. Coadministration of the human peptide transporter 1 (hPEPT1) substrates valacyclovir and cephalexin minimally reduced the acyclovir AUC. These results suggest a stable valacyclovir absorption phenotype, significant interindividual variability, and minimal interaction between these hPEPT1 substrates.

* Corresponding author. Mailing address: Department of Clinical Pharmacy, Box 0622, C-144, University of California at San Francisco, San Francisco, CA 94143. Phone: (415) 476-1927. Fax: (415) 476-6632. E-mail: bjg{at}itsa.ucsf.edu.

{dagger} Present address: ISREC, 1066 Epalinges, Switzerland.

{ddagger} Present address: Ohio State University, Columbus, OH 43210.

Antimicrobial Agents and Chemotherapy, July 2003, p. 2351-2353, Vol. 47, No. 7
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.7.2351-2353.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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