Abstract
1. Trimethadione (TMO) has the properties required of probe drugs for the evaluation of hepatic oxidizing capacity in vivo. 2. TMO is demethylated to dimethadione (DMO), its only metabolite, in the liver after oral administration. 3. In rats with various types of hepatic intoxicated-, induced- and partially hepatectomized-rats, the serum DMO/TMO ratios, which were measured on blood samples obtained by a single collection 2 hr after oral administration of TMO, correlated well with the degree of hepatic damage or induction. 4. This finding suggests that TMO may be used as a probe drug in the rapid determination of the functional reserve mass of the liver as well as the hepatic oxidizing capacity.
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