Abstract
Upadacitinib (ABT-494) is a selective Janus kinase 1 inhibitor being developed for treatment of auto-immune inflammatory disorders. This work evaluated effects of high-fat meal, cytochrome P450 (CYP) 3A inhibition, CYP induction, and organic anion transporting polypeptide (OATP) 1B inhibition on upadacitinib pharmacokinetics. Two Phase 1 evaluations were conducted, each in 12 healthy subjects. In Study 1, using a randomized, two-sequence crossover design, a 3 mg dose of upadacitinib (immediate-release capsules) was administered alone under fasting conditions, after high-fat meal, or on Day 4 of a 6-day regimen of 400 mg once-daily ketoconazole. In Study 2, a 12 mg upadacitinib dose was administered alone, with the first, and with the eighth dose of a 9-day regimen of rifampin 600 mg once daily. Upadacitinib plasma concentrations were characterized. Administration of upadacitinib immediate-release capsules after a high-fat meal decreased upadacitinib Cmax by 23% and had no impact on upadacitinib AUC relative to the fasting conditions. Ketoconazole (strong CYP3A inhibitor) increased upadacitinib Cmax and AUC by 70% and 75%, respectively. Multiple doses of rifampin (broad CYP inducer) decreased upadacitinib Cmax and AUC by approxi...Continue Reading
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