Why might a study drug fail to proceed from Phase 2 to Phase 3 clinical trials?
A) The drug produced too many adverse effects.
B) The drug did not appear to be effective.
C) The drug was not more effective than drugs already on the market.
D) All of these answers are correct.

Question

Quizplus · Accepted Answer

All three reasons are common causes for a study drug to fail to proceed from Phase 2 to Phase 3 clinical trials. The drug may produce too many adverse effects, not prove to be effective, or not demonstrate greater effectiveness than drugs already on the market.

Why Might a Study Drug Fail to Proceed from Phase