title: Monthly variations in the clearance of antipyrine in the rat.
abstract: The variation in the pharmacokinetics of antipyrine was determined in synchronized rats over a period of 12 consecutive months. The mean values +/- SE (range) for the serum half-life, apparent volume of distribution and total body clearance of antipyrine were: 2.5 +/- 0.6 (1.6-4.9) h, 868.7 +/- 203.9 (590-1275) ml/kg and 269.2 +/- 14.7 (165-516) ml/h/kg respectively. The magnitude of the variation was three fold for the serum half-life and body clearance and two fold for the apparent volume of distribution. A new gas-liquid chromatographic assay for antipyrine is also described.
mesh_terms: D000818:Animals; D000983:Antipyrine / Q000378:metabolism*; D006207:Half-Life; D008099:Liver / Q000378:metabolism; D008297:Male; D008657:Metabolic Clearance Rate; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
chemical_list: D000983:Antipyrine