Darbecon 40 mcg Darbecon 40 mcg is an injectable medicine containing darbepoetin alfa, which helps the body produce more red blood cells when natural red blood cell production is insufficient. It is mainly used to manage certain types of anemia, particularly in people with chronic kidney disease or those receiving specific cancer treatments. By stimulating the bone marrow to increase red blood cell production, it helps improve hemoglobin levels and support normal oxygen delivery throughout the body.