Phase II consists of efficacy trials of the drug, which are tested on volunteers of the target population. When everything goes right, the drug manufacturer discusses the development process, continued human testing, other concerns and protocols for phase III with the FDA. Phase III is the more extensive. It is at this time that the manufacture can work for the accelerated development and review of the drug. Treatment IND and parallel tracking also occur at this stage or phase. Upon completion of phase III, the manufacturer files a New Drug Application or NDA, which is reviewed for 1-2 years. At this stage, the FDA consults advisory committees of experts for advice on safety, effectiveness and labeling. If and when approved, marketing may be done with FDA-regulated labeling. FDA also collects safety information on the drug's use and adverse effects, if any. There will be occasional requests for changes in labeling...
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