Phase I is most typically which kind of study?

• A. Human Pharmacology
• B. Therapeutic Confirmatory
• C. Post-marketing surveillance
• D. Real-world evidence study

Answer: (A)

Phase I trials focus on how a drug behaves in humans and its initial safety profile. They are centered on human pharmacology—assessing pharmacokinetics (how the body processes the drug), pharmacodynamics (the drug’s effects on the body), tolerability, and determining a safe starting dose and dose range. This makes “Human Pharmacology” the best label for Phase I.

Other options describe later-stage or non-trial activities: therapeutic confirmatory studies are Phase III and test efficacy in larger patient groups; post-marketing surveillance is Phase IV, monitoring safety after approval; real-world evidence studies are observational studies outside the controlled trial setting.