Precursor to metabolite: Nordiazepam to Oxazepam

Nordiazepam is converted to Oxazepam by CYP3A4.

The pair

Nordiazepam — Long-acting active metabolite of diazepam and several other benzodiazepines; accumulation can prolong sedation.
Oxazepam — Short-acting benzodiazepine cleared by glucuronidation; favored in liver disease.

Anything that inhibits or induces CYP3A4 shifts the balance between Nordiazepam and Oxazepam.