title: Pharmacokinetics and bioavailability of a long-acting formulation of cephalexin after intramuscular administration to cats.
abstract: The pharmacokinetic profile and bioavailability of a long-acting formulation of cephalexin after intramuscular administration to cats was investigated. Single intravenous (cephalexin lysine salt) and intramuscular (20% cephalexin monohydrate suspension) were administered to five cats at a dose rate of 10 mg/kg. Serum disposition curves were analyzed by noncompartmental approaches. After intravenous administration, volume of distribution (V(z)), total body clearance (Cl(t)), elimination constant (λ(z)), elimination half-life (t(½)(λ)) and mean residence time (MRT) were: 0.33±0.03 L/kg; 0.14±0.02 L/hkg, 0.42±0.05 h(-1), 1.68±0.20 h and 2.11±0.25 h, respectively. Peak serum concentration (C(max)), time to peak serum concentration (T(max)) and bioavailability after intramuscular administration were 15.67±1.95 μg/mL, 2.00±0.61 h and 83.33±8.74%, respectively.
authors.affiliation: Cátedra de Farmacología, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Chorroarín 280 (1427), Buenos Aires, Argentina. Electronic address: albarell@fvet.uba.ar.
authors.forename: G A
authors.initials: GA
authors.lastname: Albarellos
authors.affiliation: Cátedra de Farmacología, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Chorroarín 280 (1427), Buenos Aires, Argentina.
authors.forename: L
authors.initials: L
authors.lastname: Montoya
authors.affiliation: Cátedra de Farmacología, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Chorroarín 280 (1427), Buenos Aires, Argentina.
authors.forename: P C
authors.initials: PC
authors.lastname: Quaine
authors.affiliation: Cátedra de Farmacología, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, 60 y 118, Buenos Aires, Argentina.
authors.forename: M F
authors.initials: MF
authors.lastname: Landoni
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D001682:Biological Availability; D002415:Cats; D002506:Cephalexin / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D003692:Delayed-Action Preparations / Q000008:administration & dosage / Q000493:pharmacokinetics; D007273:Injections, Intramuscular / Q000662:veterinary; D007275:Injections, Intravenous / Q000662:veterinary
chemical_list: D000900:Anti-Bacterial Agents; D003692:Delayed-Action Preparations; D002506:Cephalexin