THOUSAND OAKS, Calif.--(BUSINESS WIRE)--Amgen Inc. (NASDAQ:AMGN) today announced the U.S. Food and Drug Administration (FDA) has approved updated safety information, including an updated boxed warning in the labeling information for the class of drugs known as erythropoiesis-stimulating agents (ESAs), including Aranesp® (darbepoetin alfa) and EPOGEN® (Epoetin alfa).