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What is the purpose of Phase IIIa trials?

  1. To explore additional disease indications

  2. To prove the drug's safety and efficacy

  3. To test the drug on animals

  4. To study the drug's long-term effects

The correct answer is: To prove the drug's safety and efficacy

Phase IIIa trials are designed to test the safety and efficacy of a drug in a larger group of people, usually spanning across multiple locations. They are meant to provide additional evidence of a drug's effectiveness and safety before it is released to the market. A To explore additional disease indications - While Phase IIIa trials may expand the use of a drug to other indications, it is not the primary purpose. The main goal is to prove the drug's safety and efficacy. C: To test the drug on animals - Phase IIIa trials are specifically conducted on humans and do not involve animal testing. Animal testing is typically done in earlier stages of drug development. D: To study the drug's long-term effects - While long-term effects may be observed during Phase IIIa trials, the primary purpose is to prove the drug's safety and efficacy. Long-term effects are studied in Phase IV post-marketing