Last update: March 28, 2014

Xenon -133

Low Risk for breastfeeding

Moderately safe. Probably compatible.
Mild risk possible. Follow up recommended.
Read the Comment.

They are radioactive isotopes of Xenon, a noble or inert gas present in the atmosphere to a small extent. It is used to measure blood flow of lungs and brain.
Theoretically, half-life span (radioactivity) of X-133 is 5 days, and, X-127 is 36 days, but, because it is an inert gas it can not be accumulated, thus its actual half-life span = 0. It is exhaled within few minutes. The mother should wait just for few minutes before resuming BF.


We do not have alternatives for Xenon -133.

Suggestions made at e-lactancia are done by APILAM´s pediatricians and pharmacists, and are based on updated scientific publications.
It is not intended to replace the relationship you have with your doctor but to compound it.

Jose Maria Paricio, Founder & President of APILAM/e-Lactancia

Your contribution is essential for this service to continue to exist. We need the generosity of people like you who believe in the benefits of breastfeeding.

Thank you for helping to protect and promote breastfeeding.

José María Paricio, founder of e-lactancia.

Other names

Xenon -133 is also known as


  1. ICRP. Radiation dose to patients from radiopharmaceuticals. Addendum 3 to ICRP Publication 53. ICRP Publication 106. Annex D. Recommendations on breast-feeding interruptions, p. 163-165. Ann ICRP. 2008 Abstract Full text (link to original source) Full text (in our servers)

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