A fluidic group couplable to a first container defining a first internal volume adapted to contain a drug, and to a second container defining a second internal volume adapted to contain an ingredient for the preparation of said drug, the fluidic group comprising a first body defining a first cavity and including: - a syringe comprising a second body defining a second cavity housing a piston movable in the second body and defining, with the second body, a chamber having a variable volume as a function of a position of the piston in the second cavity; - a first coupling group (171, 172) extending partially outside the first cavity and fixable in a releasable manner to the second container so as to be in fluid communication with the second internal volume; - a second coupling group extending partially outside the first cavity and fixable in a releasable manner to the first container so as to be in fluid communication with the first internal volume; - a forking element having a first and a second inlet arranged in fluid communication with the first coupling group (171, 172) and, respectively, with the second coupling group, and furthermore having a third inlet in fluid communication with said chamber, the third inlet further communicating with the first and second inlets so as to create a first fluidic path between the second internal volume and said chamber and a second fluidic path between said chamber and the first internal volume; - a first valve of one-way type, interposed along the first fluidic path between the first coupling group (171, 172) and the forking element and controllable, according to a first pressure gradient caused by a movement of the piston in the cavity, to allow the passage of the ingredient from the second container to the chamber of the syringe; and - a second valve of one-way type, interposed along the second fluidic path between the second coupling group and the forking element and controllable, as a function of a second pressure gradient opposite the first pressure gradient, to allow the passage, from said chamber to the first container, of the ingredient transferred from the second container into the chamber of the syringe. - a syringe comprising a second body defining a second cavity housing a piston movable in the second body and defining, with the second body, a chamber having a variable volume as a function of a position of the piston in the second cavity; - a first coupling group (171, 172) extending partially outside the first cavity and fixable in a releasable manner to the second container so as to be in fluid communication with the second internal volume; - a second coupling group extending partially outside the first cavity and fixable in a releasable manner to the first container so as to be in fluid communication with the first internal volume; - a forking element having a first and a second inlet arranged in fluid communication with the first coupling group (171, 172) and, respectively, with the second coupling group, and furthermore having a third inlet in fluid communication with said chamber, the third inlet further communicating with the first and second inlets so as to create a first fluidic path between the second internal volume and said chamber and a second fluidic path between said chamber and the first internal volume; - a first valve of one-way type, interposed along the first fluidic path between the first coupling group (171, 172) and the forking element and controllable, according to a first pressure gradient caused by a movement of the piston in the cavity, to allow the passage of the ingredient from the second container to the chamber of the syringe; and - a second valve of one-way type, interposed along the second fluidic path between the second coupling group and the forking element and controllable, as a function of a second pressure gradient opposite the first pressure gradient, to allow the passage, from said chamber to the first container, of the ingredient transferred from the second container into the chamber of the syringe.