Abstract
Background and Objectives
Ketoprofen, a potent nonsteroidal anti-inflammatory drug, is clinically administered as a racemic mixture. One of the possible metabolism routes of ketoprofen is the inversion of the R- to S-enantiomer in the gastrointestinal tract. Ketoprofen, as a weak acid drug, might undergo recirculation through pancreatic/intestinal juices. The aim of the work was to investigate if a plasma-gastrointestinal tract recirculation of ketoprofen could explain its R-to-S chiral inversion after the oral administration of two modified-release formulations: a gastro-resistant delayed-release tablet (Reference) and an extended-release-plus-immediate-release bilayer tablet (Test).
Methods
Sixteen healthy Caucasian volunteers (eight women and eight men) participated in a ketoprofen bioequivalence study. Both formulations were administered with and without food. In both cases, standard meals were given throughout the experiment. R- and S-enantiomers were measured separately using a validated HPLC–UV chiral method. Mean concentration–time profiles of ketoprofen enantiomers in plasma were obtained for men and women. Area under the plasma concentration–time curve, maximum ketoprofen plasma concentration, and time-to-peak were also computed for both isomers, both modes of administration, and both sexes. S/R concentration ratio was assessed as an indicator of enantiomer chiral inversion rate.
Results
Differences in the pharmacokinetics of S- and R-ketoprofen enantiomers were found after the Test administration. S-Ketoprofen presented a lower plasma exposure compared to R-enantiomer. However, the S/R concentration ratio increased 1 h (in men) and 2 h (in women) after meal intakes. This was related to pancreatic and/or intestinal and/or biliary secretions of the drug, followed by reabsorption and conversion of the R- to the S-isomer. The lower intestinal pH reported for men would lead to a higher oral bioavailability of the Test formulation and a higher reabsorption of both ketoprofen isomers in this sex. Hence, a higher rise of the S/R concentration ratio could be observed in men. No significant differences between isomers exposure were detected in both sexes after the Reference administration. Different lag times were observed after fed and fasting administration of this formulation; however, drug absorption coincided with food ingestion. Then, drug recirculation affected the S/R ratio from the beginning of drug exposure, minimizing the difference between isomers disposition.
Conclusions
R-to-S conversion rate could be mainly associated with several passages of the drug through the intestinal mucosa. The concentration–time profiles of ketoprofen in plasma after the administration of both formulations evidenced R-to-S conversion of recirculating drug following meal intakes.



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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
This investigation has not received any funding; however, the in vivo data were taken from a relative bioavailability study funded by Roemmers Laboratory, Uruguay.
Marianela Lorier received funds as fellow from the National Agency of Investigations and Innovation (ANII, as abbreviation of its Spanish spelling), Uruguay, under the code POS_NAC_2014_1_102512. All other authors have no conflicts of interest to declare.
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Lorier, M., Magallanes, L., Ibarra, M. et al. Stereoselective Pharmacokinetics of Ketoprofen After Oral Administration of Modified-Release Formulations in Caucasian Healthy Subjects. Eur J Drug Metab Pharmacokinet 41, 787–793 (2016). https://doi.org/10.1007/s13318-015-0313-2
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DOI: https://doi.org/10.1007/s13318-015-0313-2