Bioavailability of terfenadine in man.

Journal Article (Clinical Trial;Journal Article)

Fourteen normal male subjects were given either 60mg or 180mg of terfenadine suspension in a randomized two-way crossover study. Peak plasma concentrations of 1.544 +/- 0.726 (mean +/- S.D.) ng ml-1 were obtained in 0.786 h following the 60 mg dose and displayed an AUC or 11.864 +/- 3.369 ng h ml-1. Whereas peak plasma concentrations of 4.519 +/- 2.002 ng ml-1 in 1.071 +/- 0.514 h were obtained following the 180 mg dose. The AUC following the 180 mg dose was 44.341 +/- 22.041 ng h ml-1. When 60 mg of 14C terfenadine was given to six additional subjects, the peak plasma concentrations of 351 +/- 43 ng equivalents per ml were obtained in 1.67 +/- 0.41 h and the AUC was 2297.71 +/- 310.85 ng-equivalents h ml-1. This indicates that approximately 99.5 per cent of the terfenadine related material that is absorbed undergoes biotransformation. Urinary excretion of 14C accounted for 39.89 +/- 5.29 per cent of the dose while 60.58 +/- 2.44 per cent of the dose was recovered in the feces in twelve days. Thin-layer chromatographic (TLC) examination of fecal extracts showed only a trace of material chromatographing with terfenadine. This may indicate that the 14C present in the feces is not due to lack of absorption.

Full Text

Duke Authors

Cited Authors

  • Okerholm, RA; Weiner, DL; Hook, RH; Walker, BJ; Leeson, GA; Biedenbach, SA; Cawein, MJ; Dusebout, TD; Wright, GJ; Myers, M; Schindler, V; Cook, CE

Published Date

  • 1981

Published In

Volume / Issue

  • 2 / 2

Start / End Page

  • 185 - 190

PubMed ID

  • 6113858

International Standard Serial Number (ISSN)

  • 0142-2782

Digital Object Identifier (DOI)

  • 10.1002/bdd.2510020211


  • eng

Conference Location

  • England