Final answer:
The Federal Food, Drug, and Cosmetic Act (FD&C Act) of 1938 required adequate directions of use to be included with drug products, ensuring consumer protection through clear usage instructions.
Step-by-step explanation:
The amendment that required adequate directions of use to be included with drug products was part of the Federal Food, Drug, and Cosmetic Act (FD&C Act) of 1938. This significant legislation followed the 1906 Pure Food and Drug Act. The FD&C Act brought about comprehensive regulations ensuring that drugs were not only safe but also that they included clear instructions for use to protect the consumer. The FD&C Act has been amended multiple times to adapt to evolving health and safety standards, such as the FDAAA of 2007, which focused on postmarket safety, risk assessment, and surveillance of marketed drugs.
The Food and Drug Administration Amendments Act (FDAAA) of 2007 required drugs to have adequate directions for use. This means that drugs must include clear instructions on how to use them safely and effectively. These directions help ensure that consumers understand how to properly and safely use the medication.