A dispensing and mixing device designed to be fixed on an opening of a receiving container and adapted to receive an autonomous container having an opening closed by a closure film and containing an additive product to be dispensed into the interior space of the receiving container which contains a different product, is described. The device has a holding element adapted to receive and retain the autonomous container in the region of its opening, and an assembly element designed to be fixed on the opening of the receiving container and to receive said holding element by screwing.