This clinical trial is focused on studying the effects of treatments for rheumatoid arthritis, a condition that causes pain and swelling in the joints. The study involves two main treatments: Upadacitinib, also known by its code name ABT-494, which is taken as a tablet, and Adalimumab, marketed as Humira, which is given as an injection. Participants in the study will also be on a stable dose of Methotrexate, a common medication used to treat rheumatoid arthritis, but who have not responded adequately to it.
The purpose of the study is to compare the effectiveness and safety of Upadacitinib and Adalimumab against a placebo in people with moderate to severe rheumatoid arthritis. The study will be conducted in two periods. In the first period, participants will receive either Upadacitinib, Adalimumab, or a placebo to see how well these treatments work in reducing the symptoms of rheumatoid arthritis. The second period will focus on evaluating the long-term safety and effectiveness of Upadacitinib for those who complete the first period.
Participants will be monitored over a period of time to assess improvements in their condition, such as reduced joint pain and swelling, and to ensure the treatments are safe. The study aims to provide valuable information on how these treatments can help manage rheumatoid arthritis for those who have not had success with Methotrexate alone.



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