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  • Title: Pharmacokinetics of phenolsulfonphthalein in horse and pony mares.
    Author: Hinchcliff KW, McGuirk SM, MacWilliams PS.
    Journal: Am J Vet Res; 1987 Aug; 48(8):1256-60. PubMed ID: 3631717.
    Abstract:
    Pharmacokinetics of phenolsulfonphthalein (PSP) in horse and pony mares was determined after injection of 1 mg/kg of body weight, IV. A plasma PSP concentration vs time curve was described adequately in horses and ponies by an open, 2-compartment model. There were significant differences in the elimination phase parameters, apparent volume of distribution at steady state, and apparent volume of distribution of horses and ponies. The harmonic mean elimination half-life of PSP in horses was significantly longer (P less than 0.001) than that in the ponies (16.4 and 10.0 minutes, respectively). The mean plasma clearance of PSP in horses was significantly (P less than 0.05) less than that in ponies (0.00554 and 0.00701 L/min/kg, respectively). There was no difference between horses and ponies in the metabolic clearance of PSP. The fraction of the administered dose of PSP excreted in the urine in the first 15 minutes was not significantly different between horses and ponies.
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