Prothrombin complex concentrate (PCC), also known as factor IX complex, sold under the brand name Kcentra among others, is a combination medication made up of blood clotting factors II, IX, and X(3-factor PCC) or, when also containing factor VII as does Kcentra, 4-factor PCC. It is used to treat and prevent bleeding in hemophilia B if pure factor IX is not available. It may also be used for reversal of warfarin therapy. It is given by slow injection into a vein. Another product, activated prothrombin complex concentrate or FEIBA, may be used for acquired hemophilia.