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Clorsulon pharmacokinetics in sheep and goats following oral and intravenous administration.

Clorsulon was measured in plasma and urine of sheep and goats after administration of a single intravenous (i.v.) and after a single oral dose of 7 mg/kg. A three-compartment model with elimination occurring from the central compartment was determined to best describe the i.v. data, whereas a one-compartment model with a single exponential absorption phase best described the oral plasma data. The bioavailability of orally administered clorsulon was approximately 55% in goats and 60% in sheep. Peak plasma concentrations occurred at 14 h and 15 h after oral administration in goats and sheep, respectively. Absorption from the gastro-intestinal tract effectively prolonged the elimination of clorsulon by increasing the elimination half-life from 17 to 28 h in sheep and from 12 to 23 h in goats for the i.v. and oral routes, respectively. In both goats and sheep, approximately 50% of the i.v. dose was recovered in urine as parent drug at 48 h after administration, whereas 41% and 30% of the dose was recovered after oral administration for goats and sheep, respectively. The elimination rate constant (kel) in goats was nearly twice as large as the value determined in sheep, and the urea under the i.v. plasma curve in goats was only 63% of the value in sheep indicating that goats are more effective in their capacity to eliminate clorsulon than are sheep. These differences in drug disposition between sheep and goats may account for the reduced efficacy of clorsulon reported in goats.