Baricitinib 4mg (Barigen) is an oral medication used primarily to treat moderate to severe rheumatoid arthritis in adults who have not responded well to other treatments. It is a Janus kinase (JAK) inhibitor that works by blocking specific enzymes involved in the inflammatory process, thereby reducing pain, swelling, and joint damage. Baricitinib is also approved for use in certain cases of COVID-19 requiring hospitalization, to help manage inflammation and improve recovery. It is important for patients to follow their healthcare provider's dosage instructions and undergo regular monitoring for potential side effects, such as infections and liver enzyme changes.