Clinical studies of drugs first involve human volunteers during which phase of drug testing?

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Clinical studies of drugs involve humans' right from the start of Phase 1 clinical trials.In Phase 1 clinical trials,small and then increasing doses of the prospective drug are administered to a limited number of healthy human volunteers,primarily to determine safety.Larger groups of humans are given the drug in Phase 2 clinical trials,but humans were involved in Phase 1 clinical trials.Phase 3 involves a large number of patients who have the condition for which the drug is indicated.Phase 4 involves postmarketing surveillance.

Clinical Studies of Drugs First Involve Human Volunteers During Which