Pressure monitoring a dosed with an infusion or injection fluid product to be administered

The invention relates to a method for monitoring the pressure of a dosed with an infusion or injection to be administered product fluid, which from a container that is accommodated in a housing or is formed by this itself, distributable by advancing a received in the receptacle plunger. In this case, serving as a measure of the pressure exerted by the piston on the housing reaction force is measured and fed to a control for a drive of the piston. The control compares the measured reaction force with a predetermined reference force and controls the drive of the piston taking into account the comparison result. The reference force is a nominal value for the reaction force, and it is actual comparison between the measured reaction force and its target value performed a direct nominal /. Furthermore, the invention relates to a device which is particularly suitable for carrying out this method.