Carprofen

كتاب Carprofen


الكاتب: Multiple References

The arylpropionate anti-inflammatory drug, carprofen, was administered intravenously as the racemate at a dose rate of 0.7 mg kg -~ body weight to six Friesian bull calves aged 16-17 weeks. Anti-inflammatory and pharmacokinetic properties were investigated using a tissue cage model of inflammation based on intracaveal injection of the mild irritant, carrageenin. Carprofen displayed enantioselective pharmacokinetics, with the R(-) enantiomer predominating in plasma at all measuring times. Elimination half-life and mean residence time were shorter and volume of distribution and clearance were greater for the S(+) than for the R(-) enanfiomer. Penetration of both enantiomers into transudate (non-stimulated tissue cage) was poor but penetration into exudate (carrageenin-sfimulated tissue cage) was good. Carprofen failed to reduce exudate concentration of prostaglandin E., and the reductions in 12-hydroxyeicosatetraenoic acid were non-significant at most sampling times. The long elimination half-life of both R(-) and S(+) carprofen enantiomers and their ready penetration into and slow clearance from inflammatory exudate indicate that the drug is likely to have a long duration of action in calves. The mechanism of action is unknown but it is unlikely to involve inhibition of either cyclooxygenase or 12-1ipoxygenase.



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