pulmonary delivery

Pulmonary delivery means breathing a drug in as a fine mist or powder so it lands inside the lungs. The lungs offer an enormous, thin, blood-rich surface — roughly the area of a tennis court folded into your chest — which makes them both a direct target for lung diseases and a fast doorway into the bloodstream.

There are two goals. For local action (asthma, COPD), drug is deposited on the airway lining so a tiny dose works right where it is needed with few body-wide side effects. For systemic action, the drug crosses the very thin alveolar membrane deep in the lung into the blood, achieving rapid onset while avoiding the gut and first-pass liver metabolism. Where particles land depends on their size: too large and they hit the throat; too small and they are exhaled; only an intermediate aerodynamic size reaches the small airways and alveoli.

Delivery requires both a suitable formulation and a device — a metered-dose inhaler, dry-powder inhaler, or nebulizer — and success hinges on the patient's breathing technique as much as the chemistry. Even with good devices, only a fraction of the emitted dose typically reaches the lung; much is lost in the mouth and throat. This makes particle engineering, device design, and patient training all central to the route.