Breath actuated dry powder inhaler

An inhaler actuated by the inhalation of the user and operable with a source of pressurized air comprising:

• a housing;
• a primary air chamber wherein air is pressurized by the user;
• a secondary air chamber communicating with said primary air chamber wherein said pressurized air is stored for use after exiting the primary air chamber;
• a transfer valve wherein said transfer valve controls passage of the pressurized air stored from said secondary air chamber;
• a mouthpiece;
• a passageway communicating said mouthpiece with said transfer valve;
• a dosing container contained in said housing containing at least one dose of medicament;
• a conduit in said housing allowing communication between the transfer valve and the dose container;
• and
• means for dispensing medicament, said means being activated by a user's inhalation without other manual action which creates a vacuum in said housing thereby actuating the transfer valve releasing said pressurized air from the secondary air chamber to the conduit to the dose container expelling said dose of medicament into and out of the mouthpiece thereby administering a dose of medicament from the dose container to the user.