To: Robert K. who wrote (14182 ) 7/20/2000 12:12:54 AM From: Bluegreen Respond to of 17367 Bob, why are they putting these beagles through all of this when all they have to do is ask Stockdoc the big secrets of Genta???? I hope at least you AND GEORGE<g> realize what little ANYONE knows of Gentamycin's mode of action OR ITS FULL CAPABILTIES!!!!! Notice the T word as in Toxicological???? As you know I could go on and on but I think I have made my point>>>>>>>>>>>: Antimicrob Agents Chemother 2000 Jun;44(6):1443-7 Pharmacokinetics of gentamicin C(1), C(1a), and C(2) in beagles after a single intravenous dose. Isoherranen N, Lavy E, Soback S Kimron Veterinary Institute, Beit Dagan, Hebrew University of Jerusalem, Jerusalem, Israel. The pharmacokinetics of gentamicin C(1), C(2), and C(1a) were studied in six beagles after administration of gentamicin at 4 mg/kg of body weight as a single intravenous bolus dose. Plasma concentrations of the gentamicin components were analyzed with a novel high-performance liquid chromatography method capable of identifying and quantifying each of the components. The pharmacokinetic analysis of the plasma concentration-versus-time data was performed using the noncompartmental approach. The results indicated significant differences in the pharmacokinetic characteristics between the gentamicin components C(1), C(1a), and C(2). The mean residence times of gentamicin C(1), C(1a), and C(2) were 81+/-13, 84+/-12, and 79+/-13 min (mean +/- standard deviation), respectively. The half-lives of the respective components were 64+/-12, 66+/-12 and 63+/-12 min. Clearance (CL) of gentamicin C(1), 4.62+/-0.71 ml min(-1) kg(-1), was significantly higher (P = 0.0156) than CL of gentamicin C(1a), 1.81+/-0.26 ml min(-1) kg(-1), and C(2), 1.82+/-0.25 ml min(-1) kg(-1). Similarly, the volume of distribution at steady state (V(ss)) of gentamicin C(1), 0.36+/-0.04 liter kg(-1), was significantly higher (P = 0.0156) than the V(ss) of gentamicin C(1a), 0.14+/-0.01 liter kg(-1), and C(2), 0.15+/-0.02 liter kg(-1). Tissue binding was considered the most likely cause for the difference. The difference may have clinical and toxicological significance.<<<<<<<<<