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. 1982 Nov;71(11):1274-81.
doi: 10.1002/jps.2600711122.

Isolated Perfused Rabbit Lung as a Model for Intravascular and Intrabronchial Administration of Bronchodilator Drugs II:Isoproterenol Prodrugs

Isolated Perfused Rabbit Lung as a Model for Intravascular and Intrabronchial Administration of Bronchodilator Drugs II:Isoproterenol Prodrugs

R K Brazzell et al. J Pharm Sci. .

Abstract

The pulmonary disposition of two diester prodrugs of isoproterenol (di-p-toluoylisoproterenol and dipivaloylisoproterenol) was studied in the isolated perfused rabbit lung preparation. High-pressure liquid chromatographic methods were developed to measure diester, monoester, isoproterenol, and 3-O-methylisoproterenol from a single 1-ml perfusate sample. The prodrugs were administered directly into the circulating perfusion medium and by endotracheal instillation. Perfusate concentrations of diester, monoester, isoproterenol, and 3-O-methylisoproterenol were measured for 180 min. The diesters were rapidly eliminated from the perfusate with a subsequent increase in monoester concentrations. Isoproterenol levels were observed within minutes of prodrug administration, peaked at 60-80 min, and declined slowly thereafter. The prodrugs were rapidly absorbed following endotracheal administration with 30-50% of the diester being metabolized during the first pass through the lung.

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