Phase III clinical trial

This tests a new drug on a larger number of patients after it has been shown to be effective in a phase II trial. Phase III trials often enroll large numbers of people and may be conducted at many centres nationally or internationally. These phase III studies allow researchers to determine the tolerance and the effectiveness of the product and therefore to assess the benefit/risk ratio of the drug. 
Seventy to 90 percent of drugs entering phase III will be candidates for a marketing approval application.

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