We have studied excretion of oral O-cis-retinoic acid in urine and fec
es in vigil rats and in bile in anesthetized rats, A proportion of 53
+/- 13% of the dose of 9-cis-retinoic acid administered was eliminated
through the feces in 72 hr, and the urinary excretion was negligible.
The prevalent form of elimination in feces and urine was the unchange
d compound. Low biliary excretion was, for the most part, composed of
metabolites.