PMID: 38075Mar 1, 1979

The metabolism of N-hydroxyphentermine by rat liver microsomes

Drug Metabolism and Disposition : the Biological Fate of Chemicals
C Y Sum, A K Cho


N-Hydroxyphentermine is oxidized to 2-methyl-2-nitro-1-phenylpropane by rat liver microsome preparations. This oxidation accounts for differences noted in levels of N-hydroxyphentermine formed from phentermine in washed and unwashed microsome preparations. The reaction is inhibited by hemoglobin and catalase, whose presence in unwashed microsomes could terminate the N-oxidation of phentermine at the hydroxylamine level. The hydroxylamine-nitro-oxidation appears to be dependent on cytochrome P-450, as the reaction was induced by phenobarbital pretreatment and inhibited by carbon monoxide and 2,4-dichloro-6-phenylphenoxyethylamine.

Related Concepts

Mixed Function Oxygenases
Microsomes, Liver
Subcellular Fractions

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