What did the FDA announce on March 9, 2007?
The FDA announced new safety information about erythropoiesis-stimulating agents (ESAs). Erythropoiesis-stimulating agents (ESAs) are man-made versions of a natural protein. The natural protein is made by the kidney and stimulates the bone marrow to produce more red blood cells. ESAs are given to reduce the number of red blood cell transfusions administered to patients with certain serious diseases/conditions who are or may become anemic.