clinical trial phase

A part of the clinical research process that answers specific questions about whether treatments that are being studied work and are safe.  Phase I trials test the best way to give a new treatment and the best dose.  Phase II trials test whether a new treatment has an effect on the disease.  Phase III trials compare the results of people taking a new treatment with the results of people taking the standard treatment.  Phase IV trials are done using thousands of people after a treatment has been approved and marketed to check for side effects that were not seen in the phase III trial.

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