Lexicon · NucLex for innovators
Radiopharmaceutical
Fully specified name: Radiopharmaceutical (concept)
A medicinal preparation containing a radionuclide and used for a medical purpose.
- Scope note
- Separate radionuclide, chemical form, formulation, and use.
- Synonyms
- None recorded as true synonyms in this context.
- Monograph
- Radiopharmaceutical identity (planned; brief only)
- External mappings
- None recorded. In W0 no mapping to SNOMED CT® or any external authority is asserted for this entry. A future mapping record will carry source system, identifier, version, relation type, evidence, author, confidence where meaningful, and review state.
- Formal status
- Editorial entry only. It is not part of any released ontology and a prose edit here changes no formal definition.
Draft. This entry is an unreviewed draft. Its sources have not been checked by a named person and no domain reviewer has approved it. Treat every claim as provisional.
Notes
A radiopharmaceutical is a drug whose active component includes a radionuclide, an atom with an unstable nucleus that emits radiation as it decays. Some radiopharmaceuticals are a radionuclide in a simple chemical form. Many are a radionuclide attached, directly or through a chelator, to a targeting molecule such as a small molecule, a peptide, or an antibody. The radiation may be used to form an image, to deliver a therapeutic dose, or both.
Four things are routinely conflated in everyday speech and must be separate records in an ontology. The radionuclide answers "which atom, with which decay properties." The chemical form answers "which molecule carries it, and how is it attached." The formulation answers "what is in the vial, at what concentration, with which excipients, and with what quality attributes." The use answers "for which purpose, by which route, in which setting." Two preparations can share a radionuclide and a targeting molecule and still differ in formulation; two preparations can share a trade name across jurisdictions and differ in approved use.
Physicians usually name an agent by its clinical role, radiochemists by its structure and labeling chemistry, pharmacists by its product identity, and regulators by its authorized indication. NucLex records these as distinct facets of one entity so that each community's statement can be linked without loss. This entry asserts no indication for any product.