Kiniksa Pharmaceuticals International, plc, a biopharmaceutical company, develops and commercializes medical therapies in the United States, the United Kingdom, and internationally. The company offers ARCALYST, an interleukin-1alpha and 1beta cytokine trap for the treatment of recurrent pericarditis, a chronic autoinflammatory cardiovascular disease and cardiac sarcoidosis. It also develops KPL-387, an investigational and fully human immunoglobulin G2 monoclonal antibody, which is Phase 2/3 clinical trial for the treatment of recurrent pericarditis; and KPL-116, a Fc-modified immunoglobulin G2 monoclonal antibody, which is in pre-clinical stage.