Participating in Clinical Trials

Frequently Asked Questions

30. Why would a clinical trial be stopped early?

Clinical trials can be stopped any time in any phase of testing for several reasons.

  • Early results may show that the experimental product works much better than the others. In these cases, researchers would offer the experimental product to the control group.
  • The study may find no difference between the control group and experimental group, so further testing is useless.
  • The IRB or the Data and Safety Monitoring Committee may find a problem with the way the researchers are running the trial.
  • There may be too many dangerous side effects.