CITI Training Practice Exam

Which phase best describes a large, double-blinded study on migraine treatment with 1200 subjects?

1. Phase 1

2. Phase 2

3. Phase 3

4. Phase 4

The correct answer is: Phase 3

A large, double-blinded study with 1200 subjects on migraine treatment would fall under Phase 3 of the clinical trial process. This phase involves testing the treatment on a larger group of participants to gather more data on its safety and effectiveness. Phase 1 trials are usually smaller and are used to determine initial safety, while Phase 2 involves testing on a larger group to determine efficacy. Phase 4 trials are typically post-marketing studies that continue to gather information on the treatment's long-term effects.