Testing a new injection for rheumatoid arthritis and general safety

This trial is testing a new medication called LFD-200 to see if it is safe and how well it works for people with rheumatoid arthritis. The study includes two main stages: first, researchers will give healthy volunteers single or multiple doses to understand how the medication affects the body, then they will test it in people who have been diagnosed with moderate to severe rheumatoid arthritis. The medication is given as a subcutaneous injection, which means it is injected under the skin.

Rheumatoid arthritis is a disease where the immune system attacks the joints, causing pain, swelling, and damage. While some treatments exist, researchers are looking for new options that might help more people or work better with fewer side effects. This trial aims to find out whether this medication could become a new treatment option.