A dry-powder inhaler comprising a housing comprising at least one air inlet to a first air passage and a second air passage extending from the first air passage and terminating in a mouthpiece; the housing thereby providing a continuous air passage through the at least one air inlet, the first and second air passages, and the mouth piece; a rigid, fixed, powdered-medicament reservoir comprising a base, the reservoir being associated with the first air passage, and together with the first air passage forming a powder chamber; wherein air passing through the powder chamber travels substantially parallel to an upper surface of the reservoir and powdered-medicament positioned on the base in the reservoir, the upper surface of the reservoir having a surface area, and the reservoir having a volume.