title: Pharmacokinetics of tinidazole and metronidazole in women after single large oral doses.
abstract: Serum concentrations of tinidazole and metronidazole have been measured in healthy female volunteers who received a single dose of 2 g. of each drug in a cross-over study. Bioassays against T. vaginalis showed that metronidazole achieved higher peak concentrations (mean 81 mug./ml.) than did tinidazole (mean 67 mug./ml.), while assays for unchanged drug showed higher peak concentrations of tinidazole )mean 51 mug./ml;) than of metronidazole (mean 40 mug./ml9). This discrepancy is probably due to the presence in the serum of active metabolites of metronidazole. The longer half-life of tinidazole led to significantly higher serum concentrations (by bioassay and chemical assay) of tinidazole than of metronidazole from 6 hrs onwards.
mesh_terms: D000284:Administration, Oral; D001393:Azoles / Q000097:blood; D001682:Biological Availability; D002986:Clinical Trials as Topic; D005260:Female; D006207:Half-Life; D006801:Humans; D007700:Kinetics; D008795:Metronidazole / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D009593:Nitroimidazoles / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D014011:Tinidazole / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D001393:Azoles; D009593:Nitroimidazoles; D014011:Tinidazole; D008795:Metronidazole