title: FDA urges buyers' clubs to stop sales of underground ddC; Roche expands premarketing access programs.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000188:drug therapy; D004345:Drug Industry; D006801:Humans; D011786:Quality Control; D014481:United States; D014486:United States Food and Drug Administration; D016047:Zalcitabine / Q000592:standards / Q000600:supply & distribution
chemical_list: D016047:Zalcitabine