Diazepam is a benzodiazepine used to treat a number of symptoms from anxiety and panic attacks to insomnia. This stable-labeled internal standard is suited for quantitation of diazepam levels in urine, serum, or plasma by LC/MS or GC/MS for urine drug testing, clinical toxicology, forensic analysis, or isotope dilution methods. Diazepam, a benzodiazpine frequently abused recreationally, is sold under the trade name Valium?.