A metering element for an inhalation device is provided, comprising at least one opening being configured to receive a substance, wherein the opening comprises a width and an entire height, wherein the height extends along a longitudinal axis of the metering element and the width extends across the longitudinal axis, and wherein the continuous width of the opening is less than the entire height of the opening. Furthermore, an assembly for an inhalation device is provided, comprising a metering element and a sealing member wherein a removal of substance from the metering chamber upon mechanical cooperation of the metering element with the sealing member is prevented.
