Phase II Trial:SFAF
the second stage of the evaluation of a new drug
in humans; these trials evaluate drug efficacy, involve more participants
(often several hundred) and typically last longer than Phase I studies.
Phase II trials may be divided into Phase IIa (pilot trials in patients
with the disease to be treated) and phase IIb (well-controlled efficacy
trials). Typically Phase II trials are done only if Phase I trials have
shown the drug to be safe, but sometimes Phase I and Phase II studies
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