Tobramycin in bronchial secretions.

The penetration of tobramycin sulfate (nebramycin factor 6) into normal lower respiratory tract secretions was studied in a dog model. After a 1.7 mg/kg intravenous dose of tobramycin, the antibiotic was detected promptly in bronchial secretions, but the peak bronchial secretion concentration was not usually reached until 2 h after injection (mean level 1.15 mug/ml). The maximum tobramycin concentration in bronchial fluids was equal to the mean inhibitory concentrations that have been reported for about 80% of Pseudomonas isolates.