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Res Vet Sci. 1976 Jan;20(1):24-9.

Comparison of the pharmacokinetics of penicillin G and ampicillin in the horse.


The affinity and the binding capacity of horse serum proteins for ampicillin and penicillin G were measured by equilibrium dialysis or ultrafiltration technique. From the figures thus obtained it may be concluded that in the range of therapeutic concentrations the protein-bound fraction accounts for 6 X 8-8 per cent of the total ampicillin concentration and for 52-54 per cent of the total penicillin G concentration in serum. The rate of elimination of ampicillin and penicillin G in horses was assessed by following serum concentrations after a single intravenous injection. The biological half life of ampicillin was found to be 93 min and that of penicillin G 53 min in adult horses with unimpaired circulation and intact kidney and liver function.

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