An inhaler for delivering dry-powder medicament to a patient from an open blister pocket of a blister pack. The inhaler includes a housing for enclosing used and unused portions of the blister pack together with a medicament dispensing mechanism. The inhaler also includes a manifold through which air can be drawn in use of the inhaler, the manifold including an air inlet for receiving external air, at least one medicament aperture for communicating with an opened pocket of the blister pack to enable entrainment of the medicament by the air drawn through the manifold, and an air outlet for delivery of the entrained medicament to the patient. The medicament dispensing mechanism includes a guide surface for guiding the cover sheet of the unused portion of the blister pack. The manifold and the guide surface are defined by separate components of the inhaler.