ABSTRACT
The lungs have been extensively used for medicinal and recreational purposes for hundreds or even thousands of years. Pulmonary drug delivery refers to a noninvasive route of administration for delivering drugs to the body via the lungs for local and systemic effects by inhalation. The human lungs have the capacity to actively exchange various materials between the external environment and the interior of the body. This ability of the lungs makes them a very convenient and safe route for administration of a number of drugs that are considered unsuitable for administration via other routes, such as oral and parenteral routes.
