On the terrestrial toxicity of the fungicide imazalil (enilconazole) to the earthworm species Eisenia foetida.

The toxicity of imazalil (enilconazole), of its sulfate salt, and of a principal environmental transformation product to the earthworm species Eisenia foetida was determined. The 48-hr contact test and the 14-day artificial soil test as described by OECD guideline 207 were carried out. Concentrations of the parent substance in earthworm tissues at the end of the exposure in soil were determined by gas chromatography.

Excretion and biotransformation of cisapride in rats after oral administration.

The excretion and biotransformation of cisapride, a novel gastrokinetic drug, were studied after single (10, 40, and 160 mg/kg) and repeated (10 mg/kg/day) po administration to rats, using three different radiolabels. In fasted rats, cisapride was absorbed almost completely, except for the 160 mg/kg dose. Cisapride was metabolized extensively to at least 30 metabolites.

Excretion and biotransformation of cisapride in dogs and humans after oral administration.

The excretion and biotransformation of cisapride, a novel gastrokinetic drug, were studied after a single po dose of [14C]cisapride in dogs and humans. The excretion of radioactivity amounted to 97% within 4 days after a 1 mg/kg dose in dogs (72% in feces and 25% in urine). After a 10-mg dose in humans, 44% was excreted in the 0-24-hr urine and 37% in the 0-35-hr feces; excretion was complete within 4 days.

Excretion and biotransformation of alfentanil and sufentanil in rats and dogs.

The excretion and biotransformation of alfentanil (ALF) and sufentanil (SUF), two recent analogues of the synthetic opioid fentanyl, were studied after single iv administration of the tritium-labeled drugs in male rats and dogs. The drugs were almost completely metabolized in the two species, which resulted in a large number of metabolites. The excretion of the metabolites was rapid and exceeded 95% within 4 days, except for that of ALF metabolites in dogs (about 85%).

Excretion and biotransformation of ketanserin after oral and intravenous administration in rats and dogs.

The excretion and biotransformation of ketanserin, a novel serotonin S2-receptor blocking agent used in hypertension and related diseases, were studied after single po (1 or 10 mg/kg) and iv (2.5 mg/kg) administration in rats and dogs, using two different radiolabels. Orally administered ketanserin was well absorbed and almost completely metabolized in both species.