List of NDC products with proprietary name promacta. This medication is used to treat low platelet levels in people who have a certain blood disorder called chronic immune (idiopathic) thrombocytopenia purpura (ITP) or who have chronic hepatitis C. It may also be used to treat people with a certain blood disorder (aplastic anemia). Platelets are a type of blood cell needed to form blood clots and prevent bleeding. Eltrombopag decreases your risk of bleeding by increasing the number of platelets. Eltrombopag acts like a certain natural substance (thrombopoietin) that causes the body to produce platelets.