A clinical trial is done to find out if a medicine or treatment is safe and works well for treating a certain condition or disease.
A medicine or treatment must go through three phases before it is approved for use by the U.S. Food and Drug Administration (FDA). A fourth phase happens after the medicine or treatment has been approved.
New combinations of approved medicines can be studied in phase II, phase III, or phase IV trials.
Current as of: April 29, 2020
Author: Healthwise Staff
E. Gregory Thompson MD - Internal Medicine
Kathleen Romito MD - Family Medicine
Michael Seth Rabin MD - Medical Oncology
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