Clinical trials1,2 have four phases, which proceed sequentially. Not all drugs make it to the end of the process (if a drug ‘fails’ a phase 1 trial, there is little point in running it through phase 2!).
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Clinical trials1,2 have four phases, which proceed sequentially. Not all drugs make it to the end of the process (if a drug ‘fails’ a phase 1 trial, there is little point in running it through phase 2!).