The nomenclature for the isotopes incorporated in radiopharmaceuticals follows US adopted name (USAN, the US nomenclature agency) or INN (the international nomenclature agency) style. The USP Dictionary of USAN and International Drug Names
1 publishes USAN and INN, with USAN appearing in boldface type and INN in roman type. All USANs are reviewed by the INN Committee. The INN agent (if not intended to be marketed in the US) may not have a USAN. Almost all nomenclature is the same between the 2 groups. The single difference is stylistic. In INN style, the order is (1) name of the drug that contains the radioactive element, (2) isotope number, (3) element symbol, and (4) carrier name, if there is one. In USAN style, the order is (1) name of the drug that contains the radioactive element, (2) element symbol, (3) isotope number, and (4) carrier name, if there is one. In both, the isotope number appears as a superscript. The JAMA Network journals follow the INN style....