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Drug disposition before and after gastric bypass: fenofibrate and posaconazole.

Abstract：

AIMS:Roux-en-Y gastric bypass (RYGB) alters the anatomical structure of the gastrointestinal tract, which can result in alterations in drug disposition. The aim of the present study was to evaluate the oral disposition of two compounds belonging to the Biopharmaceutical Classification System Class II - fenofibrate (bile salt-dependent solubility) and posaconazole (gastric pH-dependent dissolution) - before and after RYGB in the same individuals. METHODS:A single-dose pharmacokinetic study with two model compounds - namely, 67 mg fenofibrate (Lipanthyl®) and 400 mg posaconazole (Noxafil®) - was performed in 12 volunteers pre- and post-RYGB. After oral administration, blood samples were collected at different time points up to 48 h after administration. Plasma concentrations were determined by high-performance liquid chromatography in order to calculate the area under the concentration-time curve up to 48 h (AUC0-48 h ), the peak plasma concentration (Cmax) and the time to reach peak concentration (Tmax ). RESULTS:After administration of fenofibrate, no relevant differences in AUC0-48 h , Cmax and Tmax between the pre- and postoperative setting were observed. The geometric mean of the ratio of AUC0-48 h post/pre-RYGB for fenofibrate was 1.10 [95% confidence interval (CI) 0.87, 1.40; P = 0.40]. For posaconazole, an important decrease in AUC0-48 h and Cmax following RYGB was shown; the geometric mean of the AUC0-48 h post/pre-RYGB ratio was 0.68 (95% CI 0.48, 0.96; P = 0.03) and the geometric mean of the Cmax pre/post-RYGB ratio was 0.60 (95% CI 0.39, 0.94; P = 0.03). The decreased exposure of posaconazole could be explained by the increased gastric pH and accelerated gastric emptying of fluids post-RYGB. No difference for Tmax was observed. CONCLUSIONS:The disposition of fenofibrate was not altered after RYGB, whereas the oral disposition of posaconazole was significantly decreased following RYGB.

journal_name

Br J Clin Pharmacol

journal_title

British journal of clinical pharmacology

authors

Gesquiere I,Hens B,Van der Schueren B,Mols R,de Hoon J,Lannoo M,Matthys C,Foulon V,Augustijns P

doi

10.1111/bcp.13054

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

1325-1332

issue

eissn

0306-5251

issn

1365-2125

journal_volume

pub_type

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Drug disposition before and after gastric bypass: fenofibrate and posaconazole.