Pharmacokinetic of Florfenicol After Administration in Sheep

Abstract

Florfenicol a monofluorinated analogue of tiamphenicol, has antibacterial activity against a broad spectrum of bacterial strains, including enteric bacteria that are resistant to chloramphenicol and tiamphenicol. Pharmacokinetic parameters of florfenikol were determined in sheep after administration a sing intravenous (İV) doses 30 mg/kg body weight. Florfenicol concentrations in plasma were determined by a validated high-performance liquid chromatography (HPLC) methods with UV dedection at a wavelength of 223 nm. Blood samples were obtained at 5., 10., 15., 20., 30., 45. minutes ile 1., 1.5, 2., 3., 4., 6., 8., 10., 12., 14., 18., 24., 30. hours after injection. Plasma concentration–time data after iv administration were best described by a two –compartment open model. Concentrations of the drug in plasma were determined by HPLC. The pharmacokinetic parameters were as follows: elimination half life (t½) was 3.34±0.25 hours, mean residence time (MRT) was 3.68 ±0.07 hours, mean volume of distribition at steady-state (Vdss) was. 0.97±0.07 kg/l, total body cleance (CL) 0.26 ±0.008 l/h/kg, area under curve (AUC) 113.13±3.45 μg.saat/ml after iv injections of 30 mg/kg doses weight.

Keywords

• Pharmacokinetic,Florfenicol,Sheep

Koyunlara Uygulanan Florfenikolün Farmakokinetiği

Abstract

Florfenikol; tiamfenikol ve kloramfenikole dirençli enterik bakterileri de içine alan geniş spektrumlu ve tiamfenikolün tek florlu yapısal analoğudur. Bu araştırmada 30 mg/kg tek doz İV yol ile uygulanan florfenikolün koyunlardaki farmakokinetik parametreleri belirlendi. Florfenikolün plazmadaki konsantrasyonları, UV detektörü bulunan, dalga boyu 223 nm olan yüksek performanslı likit kromatografi (HPLC) de belirlendi. İlaç uygulamasını takiben 5., 10., 15., 20., 30., 45. dakikalar ile 1., 1.5, 2., 3., 4., 6., 8., 10., 12., 14., 18., 24., 30. saatlerde kan örnekleri alındı. İV uygulamadan sonra HPLC tarafından belirlenen plazmadaki ilaç konsantrasyonlarından elde edilen plazma-zaman konsantrasyon verileri iki kompartmanlı modele göre değerlendirildi. İV uygulama yolu ile 30 mg/kg uygulanan florfenikolün farmakokinetik parametreleri ise eliminasyon yarılama ömrü (t½) 3.34±0.25 saat, ortalama kanda kalış zamanı (MRT) 3.68±0.07 saat, denge halindeki dağılım hacmi (Vdss) 0.97±0.07 kg/l, vücut klirensi (Cl) 0.26 ±0.008 l/h/kg, eğrinin altında kalan (AUC 0-∞) ise 113.13±3.45 μg.h/ml olarak bulunmuştur.

Keywords

• Farmakokinetik,Florfenikol,Koyun

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