Which act prohibited interstate commerce of adulterated or misbranded drugs?

• A. Biologics Control Act 1902
• B. Kefauver-Harris Amendments 1962
• C. Durham-Humphrey Amendments 1962
• D. Pure Food and Drug Act 1906

Answer: (D)

The key idea here is federal regulation of the safety and labeling of products moving across state lines. The Pure Food and Drug Act of 1906 established that drugs sold in interstate commerce could not be adulterated or misbranded, and it gave the government authority to inspect and seize those products that violated labeling and safety standards. This act is the foundation for preventing unsafe or falsely advertised drugs from reaching consumers.

The other acts address different issues. The Biologics Control Act of 1902 focused on biological products rather than all drugs. The Durham-Humphrey Amendments of 1962 clarified which medicines require a prescription and how they can be dispensed, not the adulteration/misbranding problem. The Kefauver-Harris Amendments of 1962 strengthened safety and efficacy requirements for new drugs, but the specific prohibition on adulterated or misbranded drugs moving in interstate commerce traces back to the 1906 act.