An inhaler comprising a housing to receive a strip having a plurality of blisters, each blister having a puncturable lid and containing a dose of medicament for inhalation by a user, a mouthpiece through which a dose of medicament is inhaled by a user, a cap to cover the mouthpiece and, a blister piercing element to pierce the lid of a blister is disclosed. The cap is rotatable to drive the strip to sequentially move each blister into alignment with the blister piercing element and an actuator is operable in response to rotation of the cap to cause the blister piercing element to puncture the lid of an aligned blister such that, when a user inhales through the mouthpiece, an airflow through the blister is generated to entrain the dose contained therein and carry it out of the blister and via the mouthpiece into the user's airway.