A break-open sealed package is disclosed; the sealed package includes: a first sheet of semi-rigid plastic material; a sealed pocket, which contains a dose of a product and is delimited on one side by the first sheet; and a pre-weakened area, which guides, following a folding of the first sheet, a controlled break of the first sheet in the pre-weakened area to form an outlet opening for the product through the first sheet. The pre-weakened area is arranged at one end of the first sheet and extends from a first outer edge of the first sheet to a second outer edge of the first sheet to divide the first sheet into a holding portion and into a folding portion that is smaller than the holding portion.