Comparative pharmacokinetics of diaveridine in pigs and chickens following single intravenous and oral administration.

Comparative pharmacokinetic profiles of diaveridine following single intravenous and oral dose of 10 mg/kg body weight in healthy pigs and chickens were investigated, respectively. Concentrations of diaveridine in plasma samples were determined using a validated high-performance liquid chromatography-ultraviolet (HPLC-UV) method. The concentration-time data were subjected to noncompartmental kinetic analysis by WinNonlin program. The corresponding pharmacokinetic parameters in pigs or chickens after single intravenous administration were as follows, respectively: t1/2ß (elimination half-life) 0.74 ± 0.28 and 3.44 ± 1.07 h; Vd (apparent volume of distribution) 2.70 ± 0.99 and 3.86 ± 0.92 L/kg; ClB (body clearance) 2.59 ± 0.62 and 0.80 ± 0.14 L/h/kg; and AUC0-∞ (area under the blood concentration vs. time curve) 4.11 ± 1.13 and 12.87 ± 2.60 µg∙h/mL. The corresponding pharmacokinetic parameters in pigs or chickens after oral administration were as follows, respectively: t1/2ß 1.78 ± 0.41 and 2.91 ± 0.57 h; Cmax (maximum concentration) 0.43 ± 0.24 and 1.45 ± 0.57 µg/mL; Tmax (time to reach Cmax ) 1.04 ± 0.67 and 3.25 ± 0.71 h; and AUC0-∞ 1.33 ± 0.55 and 9.28 ± 2.69 µg∙h/mL. The oral bioavailability (F) of diaveridine in pigs or chickens was determined to be 34.6% and 72.2%, respectively. There were significant differences between the pharmacokinetics profiles in these two species.