A blister strip advance mechanism comprising: an indexing gear train； drive means configured to drive said indexing gear train； and a hub (230) comprising a recess shaped to engage a first blister of a blister strip, said hub being rotatable by the indexing gear train to engage the first blister in said recess and move the engaged blister strip such that a second blister is moved to a dosing position at which the second blister (130) can be emptied； wherein the indexing gear train is configured to temporarily disengage said drive means from the hub when the second blister is in said dosing position. Also: a dosing mechanism comprising said blister strip advance mechanism； an inhaler comprising said dosing mechanism； a method for advancing a blister strip and a method for dosing a medicament comprising said method for advancing a blister strip.
