Use of polyamine compound or metal complex for manufacturing medicament or pharmaceutical composition for treating and preventing parasitic diseases, preferably protozoan parasitic disease, particularly Chagas disease. Application Number: ES2440896-B1. Patent Assignee: UdG/UGR. Inventors: Ribas Salamana X, Costas Salgueiro M, Cusso Forest O, Company Casadevall A, Lloret Fillol J, Sanchez Moreno M, Marin Sanchez C, Rosales Lombardo M J, Olmo Arevalo F