Inhalation device

A tamper resistant closure closing an opening of a container, the container defining an outer peripheral wall (97) adjacent the opening and presenting at least one inner ledge below the opening, the closure comprising a cylindrical skirt portion (92) having a lip (93) on its outer periphery, whereby when assembled the lip forms a snap fit with the ledge to hold the closure in place. The closure can be used to close the reservoir (56) of an inhalation device comprising a body (55) defining a reservoir (56) for medicament in the form of a powder, an outlet (57) through which a user can inhale, and a dosing member (53) with at least one metering recess formed therein. The dosing member (53) is moveable between a first position in which the at least one metering recess communicated with the reservoir (56) to receive a dose of powder therefrom and a second position in which the at least one metering recess communicates with the outlet (57) to permit the user to inhale the dose.