Phenomena and Processes

Half-Life

The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity.

MeSH Record

Classification

Broader headings

Related Concepts

Knowledge Graph

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MeSH Record

Synonyms

4 entry terms
  • Halflife
  • Half Life
  • Half-Lifes
  • Halflifes

MeSH Record

Indexing Annotation

usually NIM

MeSH Record

History Note

74(71)

MeSH Record

Previous Indexing

  • Time (1966-1970)
  • specific radioisotope, substance, or cell

MeSH Hierarchy

Tree Number

  1. G01w.910w.405w

AMA Style

References

  1. National Library of Medicine. Half-Life. Medical Subject Headings (MeSH). 2026. Unique ID D006207. http://id.nlm.nih.gov/mesh/2026/D006207
  2. Half-Life. In: Wikipedia. https://en.wikipedia.org/wiki/Half-life
  3. Half-Life. In: Wikidata. https://www.wikidata.org/wiki/Q47270