An inhaler device

An inhaler device 2 comprising an actuation mechanism having an indexing system 22,24 for advancing a medicament carrier comprising a base with a plurality of medicament pockets or blisters and a peelable lidding sheet covering the blisters. An opening system 30 for peeling the lidding sheet from the medicament carrier to open a blister, and a common actuator 10,42 for the indexing system and the opening system. Wherein the common actuator 10,42 is movable 34 between a first position and a second position via an intermediate position, and wherein the progression of the opening system 30 is disproportional to the progression of the indexing system 12,24 during movement of the common actuator 10, 42. The speed of movement of the opening system 30 relative to the actuator may vary 10,42. The opening system 30 may be delayed until operation of indexing 22,24 is 30% complete. The movement of the common actuator 10,42 from a first position results in advancement of the indexing system 22,24, and wherein only movement of the actuator 10,42 beyond the intermediate position results in actuation of the opening system 30. In another aspect the mechanism comprises first and second indexers, wherein the progression of the first indexer is disproportional to the progression of the second indexer.