title: Cefixime absorption kinetics after oral administration to humans.
abstract: Cefixime (CFX) absorption kinetics after oral administration to humans was studied. Four distinct models, incorporating a delay of absorption and first-order elimination kinetics, i.e. first-order absorption (M1), zero-order absorption (M0), Michaelis-Menten type absorption (MM) and Michaelis-Menten type absorption with 'an absorption window' (MM-delta t) were used to fit concentration data of CFX in 10 Chinese men following an oral dose of 400 mg. r2 and AIC were selected as measures of goodness-of-fit. The results show that the MM-delta t model provided a better fit than the other three models. The kinetic parameters were estimated as follows: Vmax' = 10.80 +/- 3.80 mg.l-1.h-1; K(m)' = 88.31 +/- 2.75 micrograms.ml-1; delta t = 4.75 +/- 0.85 h; T1/2 = 4.20 +/- 0.92 h; Tmax = 5.20 +/- 0.92 h; and Cmax = 6.04 +/- 1.70 mg.l-1.
authors.affiliation: Center of Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, Nanjing, People's Republic of China.
authors.forename: X D
authors.initials: XD
authors.lastname: Liu
authors.forename: L
authors.initials: L
authors.lastname: Xie
authors.forename: J P
authors.initials: JP
authors.lastname: Gao
authors.forename: L S
authors.initials: LS
authors.lastname: Lai
authors.forename: G Q
authors.initials: GQ
authors.lastname: Liu
mesh_terms: D000042:Absorption; D000284:Administration, Oral; D000328:Adult; D020682:Cefixime; D002439:Cefotaxime / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D002511:Cephalosporins / Q000493:pharmacokinetics*; D006801:Humans; D008297:Male; D009061:Mouth Mucosa / Q000378:metabolism
chemical_list: D002511:Cephalosporins; D020682:Cefixime; D002439:Cefotaxime