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Phase I trials primarily determine how a new drug works in humans, help to predict the dosage range and involve usually between 50 and 100 healthy volunteers. Phase I trials are short and volunteers are closely monitored at the research center where the trial is being conducted.The principal objective of Phase I trials is to assess what effect the experimental drug has in the human body - what happens to the drug once released in the human body and how the human body reacts to the drug.
The goal of Phase I trials are to: