The invention relates to an inhalation device for powdered drugs to be received by a patient by an inhalation-caused air stream, comprising at least one powder reservoir, metering means for repeatedly metering a powder dose from the reservoir, a transportation mechanism for moving said metering means from a filling position for receiving a powder dose into an emptying position for releasing said powder dose into a powder channel, at least one activating device for manual operation by the patient, said activating device being operatively connected to said transportation mechanism such that upon operation a single powder dose is being metered, said activating device comprising a dosage key (5) acting on said transportation mechanism when pressed by the patient. The inhalation device further comprises an advancing mechanism for advancing a counter means each time the inhalation device has been activated by the patient so that a powder dose has been released into the powder channel. The counter means comprises a mechanical index coupled to a locking mechanism blocking the dosage key (5) and/or the activating device and/or the transportation mechanism after a predetermined number of metering cycles after detection of the index. Moreover, the locking mechanism includes a locking lever (7) for positive engagement with the dosage key (5) and/or the activating device and/or the transportation mechanism in the blocked condition. The inhalation device (1) is characterized in that the locking lever includes signaling means integrally formed therewith engaging the index after said predetermined number of metering cycles.本發明有關一種藉由病人吸入引起之氣流，接受粉狀藥物之吸入裝置，其包含至少一種粉末貯存器；計量元件，用於重複地從該貯存器定出一粉末劑量；一輸送機構，用於將該計量元件從接受粉末劑量之充填位置，推至釋出該粉末劑量進入粉末通道之排空位置；以及至少一種作動裝置，用於供病人手動操作，該作動裝置係可操作地連接至該輸送機構，如此，操作時，計量出單一粉末劑量，該作動裝置包含一劑量鍵，當由病人按下時，作用在該輸送機構上。該吸入裝置進一步包含一推進機構，用於在每一次經由病人作動該吸入裝置時，推進一計數元件，如此藥粉劑量被釋出進入該粉末通道。該計數元件包含一偶合至一鎖定機構之機械指數件，該鎖定機構會在一預定的計量循環後，偵測該指數件後，阻斷該劑量鍵和/或該作動裝置和
