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. Said dosage key (5) while being pressed is only temporarily engaged with said transportation mechanism such that a metering cycle while be completed and the transportation mechanism and/or the metering means will be reset even if said dosage key (5) will be held in depressed condition.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；定量元件，用於重複地從該貯存器定出一粉末劑量；一輸送機構，用於將該定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，定量出單一粉末劑量，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。該劑量鍵當被按下時，僅暫時地與該輸送機構嚙合，如此同時完成一定量循環，且該輸送機構和/或定量元件將會重新設定，即使該劑量鍵被保持在按下之狀況。
