Itraconazole diffusion in sputum was studied in 11 cystic fibrosis patients
,vith allergic bronchopulmonary aspergillosis. There was a high interindivi
dual variability in sputum itraconazole concentration and sputum/ serum dru
g concentration ratio. Three children had sputum drug concentrations before
oral administration that were lower than the itraconazole MIC at which 90%
of Aspergillus fumigatus strains were inhibited, although their serum drug
concentrations were within the therapeutic range.