Modeling approach to characterize intraocular doripenem pharmacokinetics after intravenous administration to rabbits, with tentative extrapolation to humans.

Abstract:

:The aim of this study was to determine the penetration of doripenem administered intravenously into the rabbit aqueous and vitreous humors. Nineteen New Zealand White rabbits received a 20-mg dose of doripenem intravenously over 60 min. Specimens of aqueous humor, vitreous humor, and blood were obtained 30 min (n = 5), 1 h (n = 5), 2 h (n = 5), and 3 h (n = 4) after the beginning of the infusion and analyzed by high-performance liquid chromatography (HPLC). A pharmacokinetic (PK) model was developed to fit the experimental data. Doripenem concentrations in aqueous humor were lower than those in plasma ultrafiltrates at all sampling times, with an average aqueous humor-to-plasma ultrafiltrate area under the concentration-time curve ratio estimated as 8.3%. A pharmacokinetic model with peripheral elimination described the data adequately and was tentatively used to predict concentration-versus-time profiles and pharmacokinetic-pharmacodynamic (PK-PD) target attainment in patients under various dosing regimens. In conclusion, systematically administered doripenem does not seem to be a promising approach for the treatment of intraocular infections, especially since it could not be detected in the vitreous humor. However, this study has provided an opportunity to develop a new PK modeling approach to characterize the intraocular distribution of doripenem administered intravenously to rabbits, with tentative extrapolation to humans.

authors

Semoun O,Marchand S,Grégoire N,Lamarche I,Adier C,Laroche L,Goldschmidt P,Couet W

doi

10.1128/AAC.06329-11

subject

Has Abstract

pub_date

2012-07-01 00:00:00

pages

3531-4

issue

7

eissn

0066-4804

issn

1098-6596

pii

AAC.06329-11

journal_volume

56

pub_type

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