Published: Journal of Analytical Toxicology, Volume 23, Number 1, January/February 1999, pp. 29-34.
The Urinary Elimination Profiles of Diazepam and Its Metabolites,
Nordiazepam, Temazepam, and Oxazepam, in the Equine after a 10-mg Intramuscular
Dose
Amanda Marland, Pratibha Sarkar , and Randy Leavitt
A method for the extraction of diazepam and its metabolites (nordiazepam, temazepam, and oxazepam) from equine urine and serum and their quantitation and confirmation by liquid chromatography–tandem mass spectrometry is presented. Valium®, a formulation of diazepam, was administered at a dose of 10 mg intramuscularly to four standard-bred mares. Diazepam is extensively metabolized in the horse to nordiazepam, temazepam, and oxazepam. Diazepam urinary concentrations were found to be less than 6 ng/mL. Nordiazepam was found to be mainly in its glucuronide-conjugated form and was measured out to a collection time of 53–55 h. Oxazepam and temazepam were entirely conjugated, and their urinary concentrations were measured out to collection times of 121 h and 77–79 h, respectively. Diazepam and nordiazepam were measured in equine postadministration serum out to collection times of 6 and 54 h, respectively. Oxazepam and temazepam were not detected in postadministration serum.
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