A dose indicating device (9) for a metered dose inhaler (1) including: an inner wheel (11), an annular outer wheel (12), an actuator (45) and a housing (70)； the inner wheel (11) including a plurality of primary indexing teeth (22) and a flexible drive arm (23)； the outer annular wheel (12) including a plurality of secondary indexing teeth (33) on an outer face of the outer annular wheel； the inner wheel and the outer ring wheel being located at least partially inside the housing such that the inner wheel and the outer ring wheel are rotatable about a common longitudinal axis of rotation； the actuator being mobile in a plane perpendicular to the axis of longitudinal rotation to engage the primary indexing teeth of the inner wheel to rotate the inner wheel； the housing being fixed relative to the axis of longitudinal rotation and including a deflector (59)； the deflector being configured in such a way that, at the rotation of the inner wheel, the flexible actuating arm is intermittently deflected by the deflector and therefore comes into contact with the secondary indexing teeth in order to rotate the annular outer wheel around the axis of rotation； where the housing further includes a first flexible constraint (57) that engages the inner wheel to restrict rotation of the inner wheel when it is not rotated by the actuator and a second flexible restriction (55) that engages the annular outer wheel to restrict the rotation of the outer annular wheel when it is not rotated by the inner wheel； and where the second flexible constraint can engage with the secondary indexing teeth of the annular outer wheel； where the housing includes a mounting hole for the inner wheel that allows the inner wheel to rotate therein relative to the housing； and where the inner wheel includes a plurality of indentations on an outer face of the inner wheel that are engaged by the first flexible constraint and where the plurality of indentations forms the support surface of the inner wheel in t
