A manually operated inhalation device (15) adapted in such a way that the dispensing of a dose of medication from a reservoir (18) disposed in the device (15) is activated by pressing a button or lever (17), said device also comprising inhaling a mechanical return blocking device, whereby said button or lever (17) is further connected to said mechanical return blocking device, whereby said mechanical return locking device comprises two cooperating and reciprocally movable parts (1 , 17): - a first part (1) in which, parallel to a longitudinal axis, at least one set of tracks is provided comprising a first track and a second track, and the second track comprising one or more retention elements (4) and a slide guide arranged at one end of the second track； - a second cooperating part (17) in which a leg element (10) is provided comprising a coupling section (11) for coupling with the tracks provided in the first part (1), and said leg element being pushed (10) towards the first part (1) and the coupling section (11) being adapted to move in the direction of the longitudinal axis； and also the retaining elements (4) allow the coupling section (11) of the leg element (10) to move in a first direction towards the slide guide, but blocking the movement in the second opposite direction, and that the coupling section (11) of the leg element (10) slides over the slide guide, whereby the coupling section (11) and, therefore, the leg element (10) are directed from the second track To the first clue.Un dispositivo de inhalación accionado manualmente (15) adaptado de tal manera que la dispensación de una dosis de medicamento desde un depósito (18) dispuesto en el dispositivo (15) se activa presionando un botón o palanca (17), comprendiendo además dicho dispositivo de inhalación un dispositivo de bloqueo de retorno mecánico, por lo que dicho botón o palanca (17) está conectado además a dicho dispositivo de bloqueo de retorno mecánico, por lo que dicho dispositivo de bloqueo de re
