Iodine thyroid blocking

These guidelines provide a recommendation on iodine thyroid blocking (ITB), via oral administration of stable iodine, as an urgent protective action in responding to a nuclear accident.

The scope of the guidelines is confined to public health aspects of planning and implementation of ITB before and during a radiation emergency, such as dosage and timing of ITB administration, adverse effects of stable iodine, its packaging, storage, and distribution.

Key WHO publications

  • The World Health Report
    Expert assessment of global health including statistics. Each report focuses on a particular theme.
  • International Pharmacopoeia
    Collection of quality specifications for pharmaceutical substances and dosage forms, for reference or adaptation by WHO Member States.


  • The African Health Monitor
    Web platform for data and statistics, analysis and synthesis of information to support countries establish national or sub-national health observatories.
  • Public Health Panaroma
    Lessons learned from the field, as well as original research work, to facilitate the use of evidence and good practice for public health action.