Absolute bioavailability of evacetrapib in healthy subjects determined by simultaneous administration of oral evacetrapib and intravenous [13C8]-evacetrapib as a tracer
| Autor: | Boris A. Czeskis, Demetrio Ortega, Brian W. Pack, Aktham Aburub, Chris Ward, David S. Small, Ellen A. Cannady, Syeda L. Begum, William F. Annes, Jane Royalty, Qun Lin, Kenneth J. Ruterbories, Chris Hinds, Jeffrey G. Suico |
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| Rok vydání: | 2015 |
| Předmět: |
Organic Chemistry
Healthy subjects 030204 cardiovascular system & hematology Pharmacology 030226 pharmacology & pharmacy Biochemistry Confidence interval Analytical Chemistry Bioavailability 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine chemistry MicroDose Pharmacokinetics Drug Discovery Radiology Nuclear Medicine and imaging Geometric mean Spectroscopy Evacetrapib Absolute bioavailability |
| Zdroj: | Journal of Labelled Compounds and Radiopharmaceuticals. 59:238-244 |
| ISSN: | 0362-4803 |
| Popis: | This open-label, single-period study in healthy subjects estimated evacetrapib absolute bioavailability following simultaneous administration of a 130-mg evacetrapib oral dose and 4-h intravenous (IV) infusion of 175 µg [(13) C8 ]-evacetrapib as a tracer. Plasma samples collected through 168 h were analyzed for evacetrapib and [(13) C8 ]-evacetrapib using high-performance liquid chromatography/tandem mass spectrometry. Pharmacokinetic parameter estimates following oral and IV doses, including area under the concentration-time curve (AUC) from zero to infinity (AUC[0-∞]) and to the last measureable concentration (AUC[0-tlast ]), were calculated. Bioavailability was calculated as the ratio of least-squares geometric mean of dose-normalized AUC (oral : IV) and corresponding 90% confidence interval (CI). Bioavailability of evacetrapib was 44.8% (90% CI: 42.2-47.6%) for AUC(0-∞) and 44.3% (90% CI: 41.8-46.9%) for AUC(0-tlast ). Evacetrapib was well tolerated with no reports of clinically significant safety assessment findings. This is among the first studies to estimate absolute bioavailability using simultaneous administration of an unlabeled oral dose with a (13) C-labeled IV microdose tracer at about 1/1000(th) the oral dose, with measurement in the pg/mL range. This approach is beneficial for poorly soluble drugs, does not require additional toxicology studies, does not change oral dose pharmacokinetics, and ultimately gives researchers another tool to evaluate absolute bioavailability. |
| Databáze: | OpenAIRE |
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