The dispensing device comprising an active substance dispensing element (1) and adjustment means of the dispensing of said active substances, said active substance dispensing element (1) being housed inside a casing (2) formed by a first body (3) and a second body (4) that can be coupled to each other and that can rotate with respect to each other, said adjustment means comprising an opening (5) provided in said first body (3) and at least one tab (6), such that the relative position between said first (3) and second (4) bodies determines the degree of closure of said opening (5) by means of said tab (6), and in that said first body (3) comprises holes (7) supplementary to a protrusion (8), the position of said protrusion (8) inside one of said holes (7) determining varying adjustment positions of the degree of closure of said opening.
