Displaying 3 results of Upadacitinib Stable Isotopes Upadacitinib is a potent and selective inhibitor of the Janus kinase (JAK) family, which is used to treat moderate-to-severe rheumatoid arthritis. Upadacitinib Stable Isotopes are isotopes of upadacitinib with a stable nucleus, which are used in research studies and clinical trials. They have the same chemical and physical properties as the non-radioactive upadacitinib, but with a stable nucleus that does not decay over time. These isotopes are valuable tools for drug discovery and development, as they allow for accurate and precise measurement of upadacitinib's pharmacokinetics, metabolic pathways, and drug interactions.