The packaging for extemporaneous products, particularly medicinal, pharmaceutical, cosmetic products and the like, comprises a container (2) of a first substance which extends into a neck (4), a mouth (5) defined at the top of neck turned towards the outside of the container, a receptacle (6) of a second substance which is at least partially housed in said neck and a tubular body (7) with its end turned towards the inside of the container closed by a bottom and the opposite open end and which features at least one window (10) defined in its side walls, the receptacle being fitted axially sliding in the neck between a containment configuration of the second substance, in which it is retracted in the neck, and a release configuration of the second substance, in which it is at least partially protracted beyond the end of the neck turned towards the inside of the container with the window at least partially uncovered.