Abstract

Hepatic side-chain oxidation of hexobarbital was estimated in rats before, during, and after administration of sodium phenobarbital in increasing dosage for 1 to 84 days. The half-life of the enzyme was virtually the same during and after drug administration. These results indicate that phenobarbital increases synthesis of the enzyme, and they illustrate the estimation of enzyme degradation by analysis of the change in enzyme level from one steady state to another.