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Exploring Bioethics - NIH Office of Science Education - National ...

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• Phase III: Researchers give the experimental study drug ortreatment to even larger groups <strong>of</strong> people (1,000 to 3,000) toconfirm its effectiveness, monitor side effects, compare it withcommonly used treatments, and collect information that will allowpeople to use the experimental drug or treatment safely. Controlgroups are used, and the studies are blind or double-blind.• Phase IV: Researchers conduct post-marketing studies to furtherassess the risks, benefits, and optimal use <strong>of</strong> the drug or treatment.Source: Modified from U.S. <strong>National</strong> Institutes <strong>of</strong> Health. 2007. Understandingclinical trials. Retrieved September 16, 2008, from http://clinicaltrials.gov/ct2/info/understand.12345Module 5 5-176

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