An internal standard suitable for quantitation of etizolam levels in urine or other matrices by LC/MS or GC/MS in forensic analysis, clinical toxicology, or urine drug testing applications. Etizolam, sold under brand names such as Etilaam, Etizola, or Depas, is a benzodiazepine analog used for the short-term treatment of insomnia, anxiety, or panic attacks. Etizolam is also sold on the designer drug market with cases of abuse noted in Europe and the US.