Which statement best describes Phase 4 trial scope?

• A. Larger, post-marketing surveillance to assess safety and efficacy in general population
• B. Smaller, pre-approval efficacy tests
• C. Only pharmacokinetics in healthy volunteers
• D. Non-human animal testing

Answer: (B)

Phase 4 trials are conducted after a drug has been approved and focus on post-marketing surveillance in the general population. They track long-term safety and real-world effectiveness, capturing rare or delayed adverse effects and evaluating how the drug performs across broader patient groups and real-world conditions. The description of smaller, pre-approval efficacy tests refers to earlier development phases (before approval), not Phase 4. Other options point to non-human animal testing (preclinical) or pharmacokinetics in healthy volunteers (Phase I).