The in vitro uptake of [C-14]evernimicin ([C-14]SCH 27899) by primary cultu
res of rat alveolar macrophages and hepatocytes was determined. Both cell p
opulations exhibited linear rates of uptake. However, the initial rate of d
rug uptake by alveolar macrophages was about threefold higher than that by
hepatocytes. These findings demonstrate that [C-14]evernimicin is taken up
by rat alveolar macrophages, supporting the likelihood that the drug is abl
e to reach sites of infection.