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 .
FDA approves HIV drug for use in adults with resistance to existing treatments . 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 enzymes involved in HIV replication .