What are the phases of a clinical trial?
1. Phase I. A new research treatment is given to a small number of participants and emphasizes safety. The researchers determine the best way to give the new treatment, find out the drug’s most frequent and serious side effects, and how much of it can be given safely.
2. Phase II. Determine the effect of a research treatment on the particular disease or condition being evaluated.
3. Phase III. Compare the new treatment with the standard treatment and study different populations and different dosages and combinations of drugs.
4. Phase IV. Apply the new treatment to general patient care (after FDA approval for marketing).
THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.
This tool does not provide medical advice. See additional information.