Research & Regulation
Phase 2 Clinical Trial
Also called: Phase II, phase two
Definition
A stage of human clinical development that commonly explores efficacy signals, dose selection, and continued safety assessment.
What Phase 2 Clinical Trial means
Phase 2 studies often help determine whether a treatment concept is promising enough and sufficiently characterized to justify larger confirmatory trials.
Why the distinction matters
A successful Phase 2 result is meaningful, but it does not guarantee Phase 3 success or regulatory approval.
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Related glossary terms
Research & Regulation
Phase 1 Clinical Trial
An early stage of human clinical development that commonly emphasizes safety, tolerability, pharmacokinetics, and dose-ranging information.
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Phase 3 Clinical Trial
A later-stage clinical trial designed to provide substantial evidence about efficacy and safety in the intended population and use context.
Research & Regulation
Randomized Controlled Trial (RCT)
A study in which participants are assigned by a random process to different intervention or control groups.
Research & Regulation
Investigational
A compound, product, or use that is being studied and has not received approval for general marketing for that use.
Published September 6, 2026. BACToBasics glossary pages are educational definitions only and do not provide medical, dosing, preparation, treatment, or product-selection advice.