Inhaled drug delivery is also termed as pulmonary drug delivery. It is the inhalation of drug formulation through the mouth and further deposition of the inhaled pharmacological agent in lower airways is the main purpose of this drug delivery rate. The inhalation therapies involved the use of leaves from plants, vapours from aromatic plants, balsams and myhrr. Delivery of drugs directly to the site of action reduces the dose needed to produce a pharmacological effect.
In recent years, the possibility of utilizing the pulmonary route for the systemic delivery of peptides and other molecules that are not absorbed through the gastrointestinal tract has also been explored.