The present invention provides a metered dose inhaler including an ejection
mechanism with at least one chamber for containing a medicament. The
ejection mechanism is configured to effect controlled ejection of the
medicament from the chamber. The inhaler further includes a controller
configured to send electronic signals to the ejection mechanism to direct
ejection of medicament from such chamber, and configured to selectively
alter dosage of the medicament by selected changes in such electronic
signal.
