Section 127(a) of the Food and Drug Administration Modernization Act of 1997 (FDAMA or Act), 111 Stat. 2328, 21 U. S. C. ง 353a, exempts "compounded drugs" from the Food and Drug Administration's standard drug approval requirements as long as the providers of those drugs abide by several restrictions, including that they refrain from advertising or promoting particular compounded drugs. Respondents, a group of licensed pharmacies that specialize in compounding drugs, sought to enjoin enforcement of the subsections of the Act dealing with advertising and solicitation, arguing that those provisions violate the First Amendment's free speech guarantee. The District Court agreed with respondents and granted their motion for summary judgment, holding that the provisions do not meet the test for acceptable government regulation of commercial speech set forth in Central Hudson Gas & Elec. Corp. v. Public Serv. Comm'n of N. Y., 447 U. S. 557, 566 (1980). The court invalidated the relevant provisions, severing them from the rest of ง 127(a).