Pharmacokinetics of gentamicin after intravenous and subcutaneous injection in obese cats.
Six adult domestic shorthair obese cats were given 3-mg/kg gentamicin sulfate by rapid i.v. and by s.c. injection in a cross-over design. The plasma concentration-time data were analyzed using statistical moment theory with no assumption of a specific compartmental model. Means +/- SD for the half-life, which was calculated from the terminal slope of the log concentration-time curve, were 1.37 +/- 0.24 and 1.24 +/- 0.22 h following i.v. and s.c. injection, respectively. The apparent volume of distribution at steady state was 118.55 +/- 19.83 ml/kg, and total body clearance was 1.07 +/- 0.25 ml/kg/min. Bioavailability was 83.58 +/- 14.83% after s.c. administration. The calculated s.c. dose in obese cats to produce an average steady-state concentration of 4 micrograms/ml is 2.5 mg/kg every 8 h compared to 3 mg/kg in normal-weight cats.
Wright
L C
LC
Department of Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, AL 36849-5520.
Horton
C R
CR
Jernigan
A D
AD
Wilson
R C
RC
Clark
C H
CH
D000818:Animals; D001682:Biological Availability; D002371:Cat Diseases / Q000378:metabolism*; D002415:Cats; D005260:Female; D005839:Gentamicins / Q000008:administration & dosage / Q000493:pharmacokinetics*; D007275:Injections, Intravenous / Q000662:veterinary; D007279:Injections, Subcutaneous / Q000662:veterinary; D008297:Male; D009765:Obesity / Q000378:metabolism / Q000662:veterinary*; D012189:Retrospective Studies
D005839:Gentamicins