April 5, 2016, marks a revolutionary day in the treatment of autoimmune diseases: The U.S. Food and Drug Administration (FDA) approved an infliximab (Remicade) biosimilar, known as Inflectra (infliximab-dyyb). Infliximab-dyyb, which is administered by intravenous infusion, is the first biosimilar drug approved to treat rheumatic disease in the U.S.1 Infliximab-dyyb has received approval for almost…