An aerosol drug delivery apparatus is provided. The apparatus may include a reservoir constructed to contain a predetermined dose of a liquid drug, an aerosol generator in communication with the reservoir, and a power source arranged to deliver power to the aerosol generator in order to produce an aerosolized form of the dose that can be administered to a patient. The apparatus may maintain consistent aerosol drug delivery treatments, for example, by way of a breath measuring mechanism that monitors the patient's breathing pattern during the administration of the dose and a controller configured to vary the power level at which the power source during the administration of the dose based on the monitored breathing pattern.
