The inhaler (1) for inhaling a formulation (2) from capsules (3) that each contain a dose of the formulation. The capsules are each emptied in a capsule chamber (4) by being set in motion by a stream of air flowing through the capsule chamber. The stream of air can be generated by the inhalation of a user or patient and or can be generated actively by the inhaler. The capsule chamber (4) can be filled, emptied, cleaned, and or tilted and opened lengthwise. A mouthpiece (10) is provided on a housing upper part (15) of the inhaler body.