Final answer:
The Food and Drug Administration Amendments Act (FDAAA) of 2007 added the effectiveness requirement to the safety requirement from the original FDCA.
Step-by-step explanation:
The federal statute that added the effectiveness requirement to the safety requirement from the original Federal Food, Drug, and Cosmetic Act (FDCA) is the Food and Drug Administration Amendments Act (FDAAA) of 2007. This act strengthened the FDA's ability to regulate drugs by requiring manufacturers to demonstrate that their products are not only safe, but also effective for their intended use.