Tofidence is part of the Interleukin Antagonists class and treats COVID-19 and Rheumatoid Arthritis. Interleukin antagonists are used to treat rheumatoid arthritis, psoriatic arthritis, ulcerative colitis, crohn's disease, psoriasis and other autoinflammatory syndromes. They work to reduce swelling and to suppress the immune system. Tofidence is only available as a brand name drug.