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