Abstract
In the present pharmacokinetic/pharmacodynamic (PK/PD) evaluation, cortisol, total lymphocytes, and lymphocyte subpopulations were monitored following single oral doses of two oral formulations of 3 mg budesonide (BUD) (Dosage Forms A and B) in order to assess the differential effects that BUD may have on cortisol suppression and the modulation of blood lymphocyte subtypes. On a single occasion, five subjects received one 3 mg capsule of Dosage Form A, four received three capsules of Dosage Form A (single dose of 9 mg), and five received three capsules of Dosage Form B (single dose of 9 mg). Placebo capsules were administered to six subjects in the study. Cortisol concentrations, total lymphocyte counts, and lymphocyte subpopulation counts for the CD3, CD4, CD8, CD19, and CD56/16 were fitted to an in direct PK/PD response model that described the effects of BUD on serum cortisol concentrations as well as the combined effects of BUD and cortisol on total lymphocytes and the CD3, CD4, CD8, CD19, and CD56/16 subtypes. Data were also analyzed using noncompartmental methods. The PK/PD model fitted the data with the exception of data for CD56/16. The IC(50) value for unbound BUD acting on total lymphocytes was 0.276 ng/ml while the I...Continue Reading
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