An inhaler for inhalation of a formulation in powder form includes: a magazine which is rotatable and contains pre-dosed doses of the formulation in capsules, a housing which is substantially round or disc-shaped, the housing having a housing part in which the rotatable magazine is disposed, where the housing part is fixedly coupled to the rotatable magazine, and is removable from the housing in order to facilitate replacement of the magazine by inserting a new magazine.