Abstract: A dosage inhalator is provided for dispensing to a patient a pharmacologically active compound suspended in a fluid. The dosage inhalator includes a carrier having portions for carrying, by intermittent movement, predetermined and reproducible unit doses of the active compound to a conduit through which it is delivered; a maneuverer for actuating the intermittent movement of the carrier, the maneuverer being movable between first and second predetermined positions by a user of the inhalator; and a member for disrupting the movement of the maneuverer upon exhaustion of the active compound in the storage means. The carrier is actuated by a ratchet mechanism including a spring-biased pawl, the maneuverer includes a lever that is reciprocally displaceable between two distinct positions, and the movement of the ratchet mechanism is limited by the displacement of the lever.