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Determination of oral rifampin pharmacokinetic parameters in Mexicans and comparison with other populations: absence of evidence for interethnic variability.

Oral pharmacokinetics of rifampin were studied in eight Mexican young healthy male volunteers after administration of a 600 mg oral dose. After an overnight fast, subjects received medication and blood samples were drawn at selected times over a 24-h period. Rifampin plasma levels were determined by HPLC. Pharmacokinetic parameters (mean +/- SEM) were: Cmax 13.514 +/- 1.775 micrograms/ml, tmax 1.88 +/- 0.30 h, AUC 73.61 +/- 9.48 micrograms.h/ml and half-life 2.98 +/- 0.29 h. Results were compared with those obtained for other populations under similar conditions in order to explore the possibility of interethnic variability, since it has been reported that rifampin pharmacokinetics in Indonesian subjects differ from those found in Europeans. Pharmacokinetic data found in Mexicans were comparable with those observed in British, Indian, Japanese and Italian individuals. As the pharmacokinetics of rifampin seem to be similar in different populations, it is concluded that ethnic origin does not appear to play an important role. Therefore, dosing regimens designed for Caucasians can be extrapolated for other populations.