Clinical Trial, Phase III (also known as Clinical Trial, Phase 3): Work that is a report of a pre-planned, usually controlled, clinical study of the safety and efficacy of diagnostic, therapeutic, or prophylactic drugs, devices, or techniques after phase II trials. A large enough group of patients is studied and closel

NIH MeSH · D017428Publication Characteristics

Clinical Trial, Phase III

Also known asClinical Trial, Phase 3

Definition

Work that is a report of a pre-planned, usually controlled, clinical study of the safety and efficacy of diagnostic, therapeutic, or prophylactic drugs, devices, or techniques after phase II trials. A large enough group of patients is studied and closely monitored by physicians for adverse response to long-term exposure, over a period of about three years in either the United States or a foreign country.

MeSH classification

  • V03.175.250.300

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Common questions about Clinical Trial, Phase III

What does Clinical Trial, Phase III mean in medicine?
Work that is a report of a pre-planned, usually controlled, clinical study of the safety and efficacy of diagnostic, therapeutic, or prophylactic drugs, devices, or techniques after phase II trials. A large enough group of patients is studied and closely monitored by physicians for adverse response to long-term exposure, over a period of about three years in either the United States or a foreign country. This definition is taken from the National Library of Medicine's MeSH (Medical Subject Headings) 2026 release, which is the standard vocabulary used to index PubMed and most medical literature.
Is Clinical Trial, Phase III known by any other names?
Yes. Clinical Trial, Phase III is also referred to as Clinical Trial, Phase 3 in different clinical, research and patient-facing contexts. The MeSH descriptor groups all of these synonyms under a single canonical concept so research and records stay consistent.
Where does Clinical Trial, Phase III sit in the medical classification?
Clinical Trial, Phase III falls under the broader medical category "Publication Characteristics" in the MeSH hierarchy (tree numbers: V03.175.250.300). Browsing the related concepts on this page takes you to neighbouring topics in the same branch of medicine.
Where can I get a plain-language explanation of Clinical Trial, Phase III?
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Source: NIH MeSH 2026 (D017428) — National Library of Medicine, public domain. View official MeSH record ↗