A dose indicator device for a pressurised metered dose inhaler comprising: a base suitable for mounting to an upper end of a dispensing container of a pressurised metered dose inhaler, an annular inner wheel, an annular outer wheel, a drive member, a transmission cog and a flexible cover. The drive member, annular inner wheel and annular outer wheel being concentrically mounted on the base to be rotatable about a first axis of rotation. The transmission cog being mounted on the base between the annular inner wheel and the annular outer wheel to be rotatable about a second axis of rotation parallel to the first axis of rotation. The annular inner wheel comprising a plurality of primary indexing teeth on an inner annular surface thereof and one or more secondary indexing teeth on an outer annular surface thereof. The annular outer wheel comprising a plurality of indexing teeth on an inner annular surface thereof. The transmission cog comprising a plurality of gear teeth on an outer annular face thereof which, in use, can engage the indexing teeth of the annular outer wheel and which can also be engaged by the one or more secondary indexing teeth of the annular inner wheel. The drive member being mounted within the annular inner wheel. The drive member comprising a body having one or more drive arms which, in use, can engage the primary indexing teeth of the annular inner wheel. The flexible cover being flexible downwardly wherein, in use, downward movement of the drive member is accompanied by rotation of the drive member about the first axis of rotation said rotation causing rotation of the annular inner wheel by interengagement of the drive arms of the drive member and the primary indexing teeth of the annular inner wheel.
