A Study Comparing Upadacitinib (ABT-494) to Placebo in Participants With Active Psoriatic Arthritis Who Have a History of Inadequate Response to at Least One Biologic Disease Modifying Anti-Rheumatic Drug

This is a Phase 3 multicenter study that includes two periods. Period 1 is designed to compare the safety, tolerability, and efficacy of ABT-494 Dose A once daily (QD) and Dose B QD versus placebo in participants with moderately to severely active Psoriatic Arthritis (PsA) who have an inadequate response to Biological Disease Modifying Anti-Rheumatic Drug (bDMARDs). Period 2 evaluates the safety, tolerability and efficacy of ABT-494 Dose A QD and Dose B QD in subjects with PsA who have completed Period 1.