What is a legend drug?

• A. A drug that is a vaccine.
• B. A drug that requires a prescription.
• C. A drug that has no side effects.
• D. A drug that is used as a food additive.

Answer: (B)

Legend drugs are medicines that must be prescribed by a licensed veterinarian and dispensed by a pharmacist. They carry an Rx-only or Legend designation because federal law restricts their use to follow a veterinarian’s order, ensuring proper dosage, administration, and monitoring. That’s why the correct choice is the one that states the drug requires a prescription. Other options describe vaccines, assume no side effects, or depict something that isn’t a medicine at all (a food additive), none of which define what makes a drug a legend drug.