Phase 3 trials
Multiple phase 2 studies are often required to define the appropriate patient population to study during phase 3. Once the drug is deemed a potentially safe and effective candidate in Phase 2, it is then studied in Phase 3 trials. This phase often exposes more than 1000 research subjects with the disease, and is usually performed at many clinics (sometimes well over 100) to enroll the trial (or trials). There is a focus on the effectiveness of the study drug in a variety of demographic and socioeconomic subjects with variants of the disease under study. A comparison is usually made with standard drugs available on the market. It is imperative that the drug is shown to be effective and safe in this phase.
When phase 3 trials are completed (as well as the data demonstrating safety and efficacy of the study drug), a New Drug Application (NDA) containing all manufacturing, pre-clinical, and clinical data is filed with the FDA for review. If deemed safe and effective, the FDA grants approval of the NDA, which then allows the company to market the product. This approval usually comes with strict requirements for the company to conduct additional studies to keep the NDA active (usually involving pediatric trials and additional safety trials).
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