title: Comparison of pharmacokinetics of sodium and lysine cephalexin in calves.
abstract: The pharmacokinetics of sodium and lysine cephalexins were investigated after intravenous and intramuscular administration of a single dose rate of 30 mg.kg-1 body weight in calves. The data for the two salts administered intravenously were pooled, the resulting pharmacokinetic disposition of cephalexin indicating a distribution half-time (t1/2 alpha) and an elimination half-time (t1/2 beta) of 9.78 and 62.0 min, respectively. Following intramuscular administration some pharmacokinetic differences were recorded between the cephalexin preparations: lysine cephalexin was more rapidly eliminated (t1/2kel = 55.2 min) than sodium cephalexin (t1/2kel = 89.8 min), although the peak blood level was higher and attained after a longer time with lysine cephalexin.
mesh_terms: D000818:Animals; D002417:Cattle / Q000097:blood*; D002506:Cephalexin / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood*; D007273:Injections, Intramuscular / Q000662:veterinary; D007275:Injections, Intravenous / Q000662:veterinary; D007700:Kinetics; D008297:Male
chemical_list: C022152:lysine cephalexin; D002506:Cephalexin