Pharmacokinetic changes of DA-8159, a new erectogenic, after intravenous and oral administration to rats with acute renal failure induced by uranyl nitrate.

The pharmacokinetic parameters of DA-8159, a new erectogenic, were compared after intravenous and oral administration of the drug at a dose of 30 mg/kg to control rats and rats with acute renal failure induced by uranyl nitrate (U-ARF). After intravenous administration to rats with U-ARF, the plasma concentrations of DA-8159 were higher than those in control rats. This resulted in a significantly greater area under the plasma concentration-time curve from time zero to time infinity (AUC) of DA-8159 in rats with U-ARF (304 compared with 365 microg min/ml for control rats and rats with U-ARF). The significantly greater AUC in rats with U-ARF was due to significantly slower total body clearance (Cl) of DA-8159 (98.6 compared with 82.2 ml/min/kg). The significantly slower Cl in rats with U-ARF was due to slower renal clearance (1.07 ml/min/kg compared with not calculable, due to impaired kidney function) and nonrenal clearance (97.5 compared with 82.2 ml/min/kg due to slower metabolism) than those in control rats. After oral administration of DA-8159 to rats with U-ARF, the AUC (122 compared with 172 microg min/ml) was significantly greater and Cl(R) was slower (3.47 ml/min/kg compared with not calculable) than those in control rats. The significantly greater AUC in rats with U-ARF could be due to slower Cl of DA-8159 in the rats.