A dose indicator device for a pressurized metered dose inhaler comprises an inner wheel, annular outer wheel, actuator and housing；the inner wheel comprising primary indexing teeth and a flexible drive arm；the outer wheel comprising secondary indexing teeth on an outer face of the outer wheel；the inner wheel and outer wheel located at least partially within the housing such that the inner wheel and outer wheel are rotatable about a common longitudinal axis of rotation；the actuator movable in a plane perpendicular to the axis of rotation to engage the primary indexing teeth to rotate the inner wheel；the housing being fixed relative to the axis of rotation and comprising a deflector；the deflector configured such that, on rotation of the inner wheel, the drive arm is intermittently deflected and brought into contact with the secondary indexing teeth to rotate the outer wheel about the axis of rotation.
