Which benzodiazepine is not commonly detected in urine drug screens?

Lorazepam is not commonly detected in routine urine drug screens because most standard tests are designed to detect benzodiazepines that have a longer half-life or are more prevalent in the general population. While lorazepam is indeed a benzodiazepine, it is often metabolized differently compared to others such as diazepam or clonazepam, and its metabolites may not be included in standard panels.

In practice, many urine drug screens are primarily focused on detecting the most commonly abused benzodiazepines, and lorazepam, due to its shorter half-life and rapid elimination from the body, may not appear as frequently as other benzodiazepines. Additionally, some standard screens target specific metabolites that are not produced in significant quantities by the metabolism of lorazepam, leading to its frequent absence in results.

Chlordiazepoxide, diazepam, and clonazepam are more likely to be included in standard urine drug monitoring because of their duration of activity and more extensive use in prescriptions, making their metabolites more detectable in urine tests.