Precursor to metabolite: Diazepam to Temazepam

Diazepam is converted to Temazepam by CYP3A4.

The pair

Diazepam — Rapid-onset, long-acting benzodiazepine for seizures, alcohol withdrawal, and muscle spasm.
Temazepam — Intermediate benzodiazepine used mainly as a hypnotic.

Anything that inhibits or induces CYP3A4 shifts the balance between Diazepam and Temazepam.