Clinical Trial, Phase II (also known as Clinical Trial, Phase 2): 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 based on several hundred volunteers, including a limited number of patients, a

NIH MeSH · D017427Publication Characteristics

Clinical Trial, Phase II

Also known asClinical Trial, Phase 2

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 based on several hundred volunteers, including a limited number of patients, and conducted over a period of about two years in either the United States or a foreign country.

MeSH classification

  • V03.175.250.200

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Common questions about Clinical Trial, Phase II

What does Clinical Trial, Phase II 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 based on several hundred volunteers, including a limited number of patients, and conducted over a period of about two 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 II known by any other names?
Yes. Clinical Trial, Phase II is also referred to as Clinical Trial, Phase 2 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 II sit in the medical classification?
Clinical Trial, Phase II falls under the broader medical category "Publication Characteristics" in the MeSH hierarchy (tree numbers: V03.175.250.200). 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 II?
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Source: NIH MeSH 2026 (D017427) — National Library of Medicine, public domain. View official MeSH record ↗