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Clin Pharmacol Ther. 1983 Aug;34(2):202-6.

Variation in amobarbital metabolism: evaluation of a simplified population study.


Kinetic constants of amobarbital metabolism were established for 52 subjects on the basis of urinary analysis extending over several days, usually 96 hr. There was no evidence of effect of age or sex on any of the constants. C-Hydroxylation was induced by cigarette smoking as much as 100%, but glucosidation was not affected. A factor influencing the constants was ethnicity of subjects (Caucasian or Oriental). This study confirms ethnic differences in amobarbital metabolism that were reported after measuring the concentration of metabolites in single samples of urine, that is, urine specimens voided during the postdistributive phase after oral drug intake. It appears that extreme simplification of sampling methods may be contemplated in the design of metabolic investigations of populations.

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