Abstract
Estimating parameters such as pulmonary drug disposition and deposited dose, as well as determining the influence of pulmonary pharmacokinetics (PK) on drug efficacy and safety, are critical factors for the development of inhaled drug products and help to achieve a better understanding of the drugs’ fate in the lungs. Pulmonary disposition and PK have remained poorly understood due to the difficulty to access pulmonary fluids, compared to other biological fluids, such as plasma, for direct or surrogate measurement of the concentration of the active compounds and their metabolites in the lung. The use of the isolated perfused lung model (IPL) has become more common, and it is considered a useful tool to increase understanding in this area since it offers the possibility of controlling the administration and easier sampling of perfusate and lavage fluid. The model also provides an opportunity to study the relationship between PK and pharmacodynamics. This review describes the fundamentals of the IPL model, such as preparation and setting up the method, species selection, drug administration, and lung viability investigation. Besides, different applications of the IPL model like pharmacodynamic studies, pharmacokinetic parameters studies such as absorption, distribution, and metabolism, and evaluation of inhaled formulation have also been reviewed.
Keywords: Pulmonary Drug delivery, Pulmonary Drug disposition, Inhaled formulations, Isolated perfused lung (IPL) model, Pulmonary pharmacokinetics.
Graphical Abstract
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