The device (1) has a housing (2), and a flexible bag arranged in the housing and intended to receive a liquid. A dispensing device, in particular an injection syringe (5), is also arranged in the housing, so that it is removable from the housing. A transfer channel (6) serves for direct or indirect transfer of the liquid from the bag into the dispensing device. At least one pressure plate (7) is also provided, which can be pressed against the bag in order to empty the bag. The pressure plate is preferably activated via a spring mechanism (16), which serves as energy accumulator. The device, according to the invention, makes it possible, with a few manoeuvres, to prepare an injection liquid and deliver it to the injection syringe, with the substances being brought together by a largely automated procedure.
