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Drug test phases

Drug testing phases

QuestionAnswer
Phase I 20-100 Patients
Phase I Time: several months
Phase I Purpose: Mainly safety
Phase II up to several hundred patients
Phase II Time: Several months to 2 years
Phase II Purpose: Short-term safety but mainly effectiveness.
Phase III Several hundred to several thousand
Phase III Time: one to four years
Phase III Purpose: Safety, dosage, and effectiveness.
Created by: AC
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