Which act is associated with the prescription versus non-prescription classification and is sometimes called the amendment of 1951?

• A. Harrison Act 1914
• B. Durham-Humphrey Amendment of 1951
• C. Food, Drug, and Cosmetic Act of 1938
• D. Pure Food and Drug Act of 1906

Answer: (B)

The idea being tested is how drugs are categorized for use: whether they require a medical prescription or can be sold over the counter. The Durham-Humphrey Amendment of 1951 is the one that formalized this distinction, creating two classes of drugs—prescription (Rx) and non-prescription (OTC). It established that drugs dispensed only with a physician’s prescription must bear labeling that supports proper use and safety, and it allowed oral prescriptions and refills under a doctor’s order. This amendment clarified how pharmacists can supply medicines and reinforced the supervision that certain drugs require. The other laws shape regulation in different ways—earlier acts focused on truthful labeling or safety and premarket control, while the Harrison Act targeted narcotics taxation, not the Rx vs OTC framework.