HIV/AIDS Glossary

Phase 3 Trial

The third step in testing an experimental drug (or other treatment) in humans. Phase 3 trials are conducted to confirm and expand on safety and effectiveness results from Phase 1 and 2 trials, to compare the drug to standard therapies for the disease or condition being studied, and to evaluate the overall risks and benefits of the drug. This trial phase recruits a large group of people with the disease or condition, usually ranging from 1,000 to 3,000 participants. The Food and Drug Administration (FDA) reviews results from Phase 3 trials when considering a drug for approval.

Related Term(s): Clinical Trial, Food and Drug Administration, Phase 1 Trial, Phase 2 Trial, Phase 4 Trial, Preclinical


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The fourth step of a clinical trial

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