Population pharmacokinetic model of doxycycline plasma concentrations using pooled study data

Ashley Hopkins, Jessica Wojciechowski, Ahmad Abuhelwa, Stuart Mudge, Richard Upton, David Foster

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    The literature presently lacks a population pharmacokinetic analysis of doxycycline. This study aimed to develop a population pharmacokinetic model of doxycycline plasma concentrations that could be used to assess the power of bioequivalence between Doryx delayed-release tablets and Doryx MPC. Doxycycline pharmacokinetic data were available from eight phase 1 clinical trials following single/multiple doses of conventional-release doxycycline capsules, Doryx delayed-release tablets, and Doryx MPC under fed and fasted conditions. A population pharmacokinetic model was developed in a stepwise manner using NONMEM, version 7.3. The final covariate model was developed according to a forward inclusion (P < 0.01) and then backward deletion (P < 0.001) procedure. The final model was a two-compartment model with two-transit absorption compartments. Structural covariates in the base model included formulation effects on relative bioavailability (F), absorption lag (ALAG), and the transit absorption rate (KTR) under the fed status. An absorption delay (lag) for the fed status (FTLAG2 = 0.203 h) was also included in the model as a structural covariate. The fed status was observed to decrease F by 10.5%, and the effect of female sex was a 14.4% increase in clearance. The manuscript presents the first population pharmacokinetic model of doxycycline plasma concentrations following oral doxycycline administration. The model was used to assess the power of bioequivalence between Doryx delayed-release tablets and Doryx MPC, and it could potentially be used to critically examine and optimize doxycycline dose regimens.

    Original languageEnglish
    Article numbere02401
    Number of pages15
    JournalAntimicrobial Agents and Chemotherapy
    Volume61
    Issue number3
    DOIs
    Publication statusPublished - 1 Mar 2017

    Keywords

    • Doxycycline
    • Population pharmacokinetics

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