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1.
Arch. med. res ; 27(3): 349-52, 1996. tab, ilus
Article in English | LILACS | ID: lil-200335

ABSTRACT

The pharmacokinetics of oral ranitidine were studied in 24 Mexican male healthy volunteers. Subjects received a tablet containing 150 mg of ranitidine (Azantac TM, Glaxo de Mexico, Mexico, City) after an overnight fast and blood samples were drawn at several times for a period of 24 h. Ranitidine concentration in plasma was measured by high performance liquid chromatography and pharmacokinetic parameters were determined by non-compartmental analysis. Ranitide plasma concentration increased with time, reaching a maximum of (mean ñ SEM) 484 ñ 34 ng/ml in 2.7 ñ 0.2 h. Plasma levels then decayed with a terminal half-life of 4.8 ñ 0.3 h. The area under the plasma concentration against time curve was 2440 ñ 126 ngh/ml. Oral ranitidine pharmacokinetic parameters in mexicans appeared to be similar to those previously reported for caucasians


Subject(s)
Adult , Humans , Male , Chromatography , Methylene Chloride , Nizatidine , Pharmacokinetics , Plasma/drug effects , Ranitidine/pharmacokinetics
2.
Arch. med. res ; 25(4): 381-5, 1994. tab, ilus
Article in English | LILACS | ID: lil-198829

ABSTRACT

Oral pharmacokinetics of rifampin were studied in eight Mexican young healthy male volunteers after administration of a 600 mg oral dose. After and overnight fast, subjects received medication and blood samples were drawn at selected time over a 24-h period. Rifampin plasma levels were determined by HPLC. Pharmacokinetic parameters (mean ñ SEM) were: Cmax 13.514 ñ 1.775 µg/ml, tmax 1.88 ñ 0.30 h, AUC 73.61 ñ 9.48 µg.h/ml anf half-life 2.98 ñ 0.29 h. Results were compared with those obtained for the 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 Mexican were comparable with those observed in Brithis, Indian, Japanese and Italian individuals. As the parmacokinetics of rifampin seem to be similar different populations, it is concluded that ethnic origin does not a appear to play and important role. Therefore, dosing regimens designed for Caucasians can be extrapolated for other populations


Subject(s)
Ethnicity/classification , Rifampin/pharmacokinetics , Sexual Behavior, Animal/drug effects , Data Interpretation, Statistical
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