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Home > Health Library > Phases of a Clinical Trial
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:
August 22, 2019
Author: Healthwise StaffMedical Review: E. Gregory Thompson MD - Internal MedicineKathleen Romito MD - Family MedicineMichael Seth Rabin MD - Medical Oncology
Current as of: August 22, 2019
Author: Healthwise Staff
Medical Review:E. Gregory Thompson MD - Internal Medicine & Kathleen Romito MD - Family Medicine & Michael Seth Rabin MD - Medical Oncology
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