Final answer:
Diazepam (Valium®) accumulates with repeated administration. It is a benzodiazepine that can lead to tolerance and dependence if used for an extended period of time.
Step-by-step explanation:
The benzodiazepine that accumulates with repeated administration is diazepam (Valium®). Benzodiazepines are central nervous system depressants used to sedate, induce sleep, prevent seizures, and relieve anxiety. They can lead to tolerance and dependence if used for an extended period of time. Repeated use of diazepam can result in the drug building up in the body, leading to increased levels and potential adverse effects.