Romiset 125 mcg is an injectable medicine containing romiplostim, a laboratory-produced protein that helps stimulate the body's natural production of platelets. It is primarily used in chronic immune thrombocytopenia (ITP) when platelet levels remain low despite other treatments. By activating thrombopoietin receptors in the bone marrow, it encourages the production of more platelets and can help reduce the risk associated with very low platelet counts