Skip to Content

Sodium Iodide (131I)



CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Category

Diagnostic agent, thyroid function

Chemical Name

Sodium iodide (Na¹³¹I)

Foreign Names

  • Natrii iodidum (131 I) (Latin)
  • Natriumiodid (131I) (German)
  • Iodure (131I) de sodium (French)
  • Ioduro sodico (131 i) (Spanish)

Generic Names

  • Sodium Iodide I 131 (OS: USAN)
  • Natrii radio-iodati [¹³¹I], Solutio (IS)
  • Natrium radio-iodatum (IS: ¹³¹I)
  • iodure de Sodium [¹³¹I], Soluté d' (PH: Ph. Franç. 11)
  • Natrii iodidi [¹³¹I] solutio (PH: Ph. Eur. 8)
  • Natrii Radio-iodidi [¹³¹I] Injectio (PH: Ph. Int. 2)
  • Sodium Iodide [131I] capsules for diagnostic use (PH: Ph. Eur. 8)
  • Sodium Iodide I 131 Capsules/Solution (PH: USP 32)

Brand Names


ISInofficial Synonym
OSOfficial Synonym
PHPharmacopoeia Name
Rec.INNRecommended International Nonproprietary Name (World Health Organization)
USANUnited States Adopted Name

Further information on drug naming conventions: International Nonproprietary Names.

Important Notice: The international database is in BETA release. This means it is still under development and may contain inaccuracies. It is not intended as a substitute for the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of any medication in any country is safe, appropriate or effective for you. Consult with your healthcare professional before taking any medication.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.