Drug residues in food animals. III. Plasma and tissue kinetics of potassium penicillin G in young cross-bred swine |
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Authors: | H. DWIGHT MERCER RICHARD H. TESKE PATRICIA E. LONG DAVID II. SIIOWALTER HENRY H. BRYANT |
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Affiliation: | Division of Veterinary Medical Research, Bureau of Veterinary Medicine, and Bureau of Food and Drugs, Food and Drug Administration, Beltsville, Maryland 20705, U.S.A. |
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Abstract: | Twenty-two young cross-bred swine were treated either intravenously or orally with potassium penicillin G. The pharmacokinetics of penicillin G were determined in plasma and tissues. The plasma half-life of penicillin G in swine was found to be 19.45±1.69 min, and the distribution and elimination kinetics were found to fit a classical two-compartment model. The volume of distribution was found to be 0.53±0.12 1/kg, and the body clearance was found to be 19.06±5.06 ml/min/kg which exceeded the effective renal plasma flow of 16.50±2.73 ml/min/kg, suggesting that the drug was eliminated both by tubular excretion and glomerular filtration. The elimination rate constants (Beta) for the major organs were as follows: muscle, 0.00343 min-1; lung, 0.0310 min-1; fat, 0.0394 min-1; and kidney, 0.0213 min-1, which compared favorably with the elimination rate constant found in plasma (0.0320 min-1). These values were found to be significantly similar at the level of P < 0.005 in muscle, spleen and fat, and at a level of P < 0.025 in lung tissue. The data indicates that blood plasma would be a satisfactory body fluid for estimating this drug in tissue. |
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