Zolpidem Phenyl-4-carboxylic acid-D₄, 100 μg/mL

A stable-labeled internal standard is suitable for quantitation of Zolpidem Phenyl-4-carboxylic acid levels in urine or other matrices by LC/MS or GC/MS for testing applications in clinical toxicology, forensic analysis, or urine drug testing. Zolpidem Phenyl-4-carboxylic acid is the major urinary metabolite of zolpidem, accounting for 51% of an administered dose. Literature references indicate the metabolite can be found in urine for 2-3 days following ingestion of a single therapeutic dose of zolpidem.¹ Zolpidem, marketed as Ambien or Stilnox, is a nonbenzodiazepine used for the short-term treatment of insomnia.

Recommended Storage Condition
Freeze (-20°C)