A dangerous drug is defined as a drug that bears the Rx legend and is not listed in Schedules I–V or Penalty Groups 1–4. Which option best reflects this definition?

• A. A drug that bears the Rx legend and is not listed in Schedules I–V or Penalty Groups 1–4
• B. A drug listed in Schedules I–V
• C. A drug over-the-counter
• D. A drug used in dietary supplements

Answer: (A)

The key idea is identifying a drug that is prescription-only but not a scheduled or penalty-group controlled substance. A dangerous drug is defined as one that bears the Rx legend (meaning it requires a prescription to obtain) and is not listed in Schedules I–V or Penalty Groups 1–4 (so it isn’t a controlled substance). The option that states exactly this combination—Rx-labeled and not listed in the schedules or penalty groups—matches the definition precisely.

Why the other options don’t fit: a drug listed in Schedules I–V or Penalty Groups 1–4 is a controlled substance, not a dangerous drug by this definition; an over-the-counter drug does not bear an Rx legend; a drug used in dietary supplements is not Rx-labeled.