Disposition Kinetics of Amoxicillin in Healthy, Hepatopathic and Nephropathic Conditions in Chicken after Single Oral Administration

Fifteen broiler chickens (COBB 400) of 42 days of age weighing 1.8 to 2.0 kg were equally divided into 3 groups, each consisting of 5 birds. Hepatopathy was induced by oral administration of paracetamol while nephropathy was induced by intravenous administration of uranyl nitrate. Kinetic study was investigated in healthy, hepatopathic and nephropathic birds following single oral administration of amoxicillin at 40 mg kg-1. Blood samples were collected at different time schedule. Plasma concentrations of amoxicillin in healthy, hepatopathic and nephropathic birds were 41.90 ± 5.59, 9.93 ± 0.76 and 38.75 ± 6.08 μg ml-1, respectively at 1 hr; 15.34 ± 1.99, 18.57 ± 1.66 and 67.40 ± 2.62 μg ml-1, respectively at 4 hr and 2.03 ± 0.28, 15.54 ± 0.82 and 30.63 ± 1.58 μg ml-1, respectively at 24 hr. Maximum plasma concentration was detected at 1 hr in healthy birds (41.90 ± 5.59 μg ml-1 ), at 8 hr in hepatopathic birds (23.51 ± 1.64 μg ml-1) and at 4 hr in nephropathic birds (67.40 ± 2.62 μg ml-1). The drug could not be detected in plasma beyond 24 hr in healthy, 72 hr in both hepatopathic and nephropathic birds. The concentration of amoxicillin was significantly (P < 0.01) higher in most of the samples of hepatopathic and nephropathic birds compared to healthy birds. Significant higher values (P < 0.01) of t1/2 K, AUC, and MRT and lower values of K and ClB in the hepatopathic and nephropathic birds in comparison to healthy birds were observed.