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There is provided a medicament cartridge for use in an inhalation device comprising a carrier having a plurality of medicament retainers in a concentric circular path arrangement. Typically, the carrier is substantially planar. There is also provided an inhalation device comprising a housing having

There is provided a medicament cartridge for use in an inhalation device comprising a carrier having a plurality of medicament retainers in a concentric circular path arrangement. Typically, the carrier is substantially planar. There is also provided an inhalation device comprising a housing having an air inlet, an air outlet, an airway therebetween and a medicament carrier having a plurality of medicament retainers in a concentric circular path arrangement. A mover is provided for moving the medicament carrier relative to the housing so as to bring successive medicament retainers individually into communication with the airway.

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There is provided a medicament cartridge for use in an inhalation device comprising a carrier having a plurality of medicament retainers in a concentric circular path arrangement. Typically, the carrier is substantially planar. There is also provided an inhalation device comprising a housing having

There is provided a medicament cartridge for use in an inhalation device comprising a carrier having a plurality of medicament retainers in a concentric circular path arrangement. Typically, the carrier is substantially planar. There is also provided an inhalation device comprising a housing having an air inlet, an air outlet, an airway therebetween and a medicament carrier having a plurality of medicament retainers in a concentric circular path arrangement. A mover is provided for moving the medicament carrier relative to the housing so as to bring successive medicament retainers individually into communication with the airway. of the MDI inhaler; (d) a collapsible one-way inhalation valve assembly disposed between the first volume in the second volume for allowing one-way flow of gas from the first volume through the second volume to the inhalation/exhalation opening; (e) an exhalation valve assembly disposed in a wall of the housing for allowing one-way flow of gas exhaled to the inhalation/exhalation opening from the second volume to the outside atmosphere; the housing including a first foldable side section including a first fold line and a second foldable side section including a second fold line, the first foldable side section including a first side panel connected along a third fold line to a top panel and a second side panel connected along a fourth fold line to a bottom panel, the second foldable side section including a third side panel connected along a fifth fold line to the bottom panel and a fourth side panel connected along a sixth fold line to the top panel, wherein simultaneously pressing the first and second foldable side sections inward on fold the first and second foldable sections along the first and second fold line, respectively, to expand the housing, the inhalation valve assembly including an inhalation flap and a valve seat, whereby exhalation by the patient through the inhalation/exhalation opening presses the inhalation flap against the valve seat to prevent flow of exhaled gas into the first volume, inhalation by the patient through the inhalation/exhalation opening causing a portion of the inhalation flap to move away from the valve seat to provide a path for flow of gas from the first volume into a second volume between the inhalation valve assembly and inhalation/exhalation opening. 3. The medication inhalation apparatus of claim 2 wherein the first and second fold lines are substantially straight when the housing is in a collapsed configuration. 4. The medical inhalation apparatus of claim 3 wherein the third, fourth, fifth, and sixth fold lines are arcuate. 5. The medical inhalation apparatus of claim 3 wherein curvature of the third, fourth, fifth and sixth fold lines causes bending of the first, second, third, and fourth side panels as they are pressed together to expand the housing such that the first, second, third, and fourth side panels remain bent and retain the housing in the expanded configuration when pressure is no longer being applied to press the first and second foldable side sections inward. 6. The medication inhalation apparatus of claim 2 wherein the inhalation valve assembly forms a wall separating the first volume from the second volume when the housing and the inhalation valve assembly are in the expanded configuration. 7. The medical inhalation apparatus of claim 2 wherein the inhalation valve assembly includes a first panel connected by a seventh fold line to an outlet end edge of the bottom panel, a first generally trapezoidal panel connected by an eighth fold line to the first panel, a second generally trapezoidal panel connected by a ninth fold line to the first generally trapezoidal panel, and an adhesive tab connected by a tenth fold line to the second generally trapezoidal panel the first and second generally trapezoidal panels each including foldable sealing panels which are engaged by the first and second foldable side sections to form seals to prevent inhaled gas from bypassing the inhalation valve assembly. 8. The medical inhalation apparatus of claim 2 wherein the inhalation valve assembly includes first and second foldable sealing panels which are engaged by the first and second foldable side sections, respectively, such that the first and second sealing panels fold against and form seals with the first and second foldable side sections, respectively, to prevent inhaled gas and exhaled gas from bypassing the inhalation valve assembly. 9. The medication inhalation apparatus of claim 2 wherein the housing and the inhalation of assembly are integral and are composed of a single