The monitoring device (1) comprises a platelet (2) with an electronic circuit (3) for detecting and recording an extraction movement of pills (4) belonging to a blister (5), and a unit (6) for fixing the blister to the platelet. The platelet is formed of a support comprising a conductor a circuit for forming interrupters that are opened when the pills are manually extracted by the user. The conductor comprises a printed yarn of a metal conductor, where the yarn comprises conductive portions along a conductive path. The monitoring device (1) comprises a platelet (2) with an electronic circuit (3) for detecting and recording an extraction movement of pills (4) belonging to a blister (5), and a unit (6) for fixing the blister to the platelet. The platelet is formed of a support comprising a conductor a circuit for forming interrupters that are opened when the pills are manually extracted by the user. The conductor comprises a printed yarn of a metal conductor, where the yarn comprises conductive portions along a conductive path. The conductive path is each time arranged for providing a high resistance along the parallel portion. The support is formed of a thin, flexible and foldable transparent plastic sheet. Frangible portions are regularly provided on sides to correspond to a pill. Four breakage points of the conductive portions are provided with the corresponding pill at the edge of frangible portion such that the frangible portion, the platelet and the point of breakage of the conductive portion are simultaneously broken when the pill is extracted. The electronic circuit comprises total impedance measuring unit of the conductive part for providing the extraction movement of the pill. The conductive portion forms a U shaped spring with a puller on an edge of the frangible portion. The breakage points are situated at a distance (1-3 mm) of the frangible portion outside the support, and are formed by two inlets at a level of the U shaped bar and other two at a level o
