An inhaler for inhalation of a medicament from a pierced capsule has a swirling or emptying chamber (29) where the capsule is emptied by inhalation action of an operator. A rotary magazine (23) for a multi-unit dose inhaler is also disclosed, which holds a number of capsules containing a medicament in a number of recesses arranged around the periphery of the magazine. The capsules are held in place by pins (101) or plugs at both ends. Either the capsules are pierced before being loaded into the magazine (23) or they are pierced by the pins (101) when they are loaded into the magazine (23). In either case a seal may be provided around the ends of the capsules near the holes which are plugged to keep them fresh. When a recess is rotated to a particular position (41) within the magazine (23) then it releases its capsule. Contents of a capsule are drawn out during inhalation when the capsule is in the swirling chamber (29). A motor can be used to operate the magazine.