The invention provides an inhaler of the non-reservoir kind (i.e. one which operates by dispensing individually packaged doses) characterised by the feature that a moisture-proof barrier--which may optionally comprise substantially or partly an external region of the inhaler-encloses the dose-storage region of the inhaler without enclosing the doses individually, and incorporates a similarly moisture-proof aperture through which the medicament doses can, in use, be individually dispensed. The invention also provides a method of filling such an inhaler.