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Pharmacoepidemiol Drug Saf. 2001 Mar-Apr;10(2):127-34.

Population screening for isoniazid acetylator phenotype.

Author information

1
Department of Pharmacology, University of Stellenbosch, Republic of South Africa.

Abstract

PURPOSE:

To establish a useful method for acetylator phenotypification and therapeutic drug monitoring of patients receiving isoniazid.

METHODS:

Sixty patients with uncomplicated pulmonary tuberculosis were given a 5-mg/kg oral dose of isoniazid each. Plasma concentrations of isoniazid and its metabolite, acetyl-isoniazid, were determined by HPLC analyses at various post-dose times. From the isoniazid concentration and the concentration ratio of acetyl-isoniazid and isoniazid (metabolic ratio), phenotypification methods were assessed.

RESULTS:

The metabolic ratios at 3 h post-dose revealed a trimodal distribution; a fast, intermediate and slow acetylator phenotype group. The 2-h and 6-h data showed different bimodal combinations of these phenotype groups. The metabolic ratio phenotypification method could be simplified by using the HPLC data directly without converting it to absolute concentrations.

CONCLUSIONS:

A single-sample test based upon the plasma isoniazid concentration, combined with the metabolic ratio of acetyl-isoniazid and isoniazid, appears to be a reliable parameter for phenotype discrimination and for bioavailability testing.

PMID:
11499851
DOI:
10.1002/pds.570
[Indexed for MEDLINE]

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