Urinary screening for alprazolam, triazolam, and their metabolites with the EMIT d.a.u. benzodiazepine metabolite assay.

Alprazolam (Xanax) and triazolam (Halcion) are relatively new triazolobenzodiazepines that are anxiolytic and hypnotic. This study assesses the reactivity of these drugs and their major metabolites in the EMIT d.a.u. benzodiazepine metabolite assay. Analytical standards of drugs and metabolites and urine specimens from patients receiving these drugs were analyzed by EMIT. Alprazolam and alpha-OH alprazolam gave an equivalent response to the EMIT low calibrator between 0.2 and 0.3 microgram/mL. Triazolam and alpha-OH triazolam were reactive between 0.3 and 0.5 microgram/mL. The assay was positive in 24 out of 27 random urine specimens from alprazolam-treated patients and in 8 out of 19 urine specimens from triazolam-treated patients. Positive urine results were confirmed by measuring the major urinary metabolites alpha-OH alprazolam and alpha-OH triazolam by HPLC. The study demonstrates that the EMIT assay can detect significant amounts of alprazolam and metabolites in the urine. The assay was negative in 58% of the specimens from individuals receiving triazolam, however.