Enhancing effect of bucolome on biliary excretion of ouabain and digoxin in the rat.

The effect of bucolome (1-cyclohexyl-5-n-butyl-2,4,6-trioxoperhydropyrimidine) on the biliary excretion of intravenously administered ouabain and digoxin was examined in rats. The intravenously administered [3H] ouabain (0.1 mg/100 g b wt) was more rapidly excreted in the bile in female rats than in males. Intraperitoneal administration of bucolome induced a two fold increase in bile flow rate, accompanied by a significant increase in biliary recovery of ouabain during first 10 min (by 100% in males and 50% in females) resulting in significantly higher 60-min total biliary recoveries in both sexes. In female rats 80% of radioactivity was recovered in the bile as an unmetabolized form after 10 min of intravenous administration of [3H] digoxin. Biliary excretion of the parent drug, digoxin, was also enhanced by intraperitoneal administration of bucolome. Although the underlying mechanism(s) remains unknown, it was shown that biliary excretion of both ouabain and digoxin was enhanced by bucolome, as was previously shown for ouabain in male rats.