The present invention relates to an inhaler device for use with an elongate strip medicament carrier comprising a base with a plurality of medicament pockets or blisters and a peelable lidding sheet covering the blisters, the inhaler device comprising; an indexer movable in a first direction to advance a blister pocket into an inhalation position; an opening system for peeling the peelable lidding sheet from the base to expose medicament within each medicament pocket; the opening system comprising a peel management component movable in a first direction corresponding to said first direction of the indexer to delay the peeling action when the indexer is advanced, and in a second, opposite, direction to allow the lidding sheet to be peeled from the base; wherein the indexer and peel management component are separately driven in said first direction so that movement of the indexer does not dictate movement of the peel management component.