The Food and Drug Administration (FDA) is amending its regulations describing postmarketing reporting requirements to implement certain provisions of the Food and Drug Administration Modernization Act of 1997 (the Modernization Act). The changes apply to drug products that are life supporting, life sustaining, or intended for use in the prevention of a serious disease or condition and that were not originally derived from human tissue and replaced by a recombinant product. The final rule implements provisions of the Modernization Act by requiring an applicant who is the sole manufacturer of one of these products to notify FDA at least 6 months before discontinuing manufacture of the drug product.