Abstract: A medicine inhaler has a main body, to which a source of pressurized gas and a source of medicine are attached. By depressing a valve, compressed air enters an ejector through a main channel and atomizes medicine that is drawn into an atomization region by the compressed air. When a piston is in a lower position, into which it is biased by a spring, medicine is free to run into a dosage chamber but is sealed off from an ejection channel and the environment. When the piston is forced upward by compressed air tapped from the main channel, the dosage chamber is sealed off from the medicine source before the dosage chamber is raised to a position in which it communicates with the ejection chamber. When the piston returns to the lower position it generates a secondary puff of air, which enters the main channel to atomize and force residual medicine to the patient. A return channel is also provided to return post-atomized and condensed or improperly atomized medicine to the dosage chamber.