The present invention relates to (4s) -4-isopropyl-1,4,6,7-tetrahydro-5h-imidazo [4,5-c] pyridine-5-mesylate mesylate and sulfate salts (3s) -tetrahydrofuran-3-yl carboxylate, and hydrates thereof, and their use in medicine.a presente invenção refere-se a sais de mesilato e sulfato de mesilato de (4s)-4-isopropil-1,4,6,7-tetra-hidro-5h-imidazo[4,5-c]¬piridina-5-carboxilato de (3s)-tetra-hidrofuran-3-ila, e hidratos dos mesmos, e seu uso em medicina.