FDA approved HIV drugs for use in patients with access to existing drugs . Isentress , by Merck & Co. , is the first of new class of drugs to get approval . `` Its mechanism of action is particularly important in that it blocks the ability of the virus to integrate itself into the genes of cells , '' Fauci said . More testing necessary before it is approved for new HIV patients , children . Drug works by blocking different genes involved in HIV infection .
FDA approved HIV drugs for use in patients with access to existing drugs . Isentress , by Merck & Co. , is the first of new class of drugs to get approval . More testing necessary before it is approved for new HIV patients , children . Drug works by blocking different genes involved in HIV infection .