A radioactive gas that is inhaled and helps test for lung problems or blood flow problems in other areas of the body.


An inhaled radionuclide used to measure lung function and organ blood flow.


Xenon-133 is an inhaled radionuclide used for lung imaging, imaging blood flow in the brain, and to assess pulmonary function.



Inhalation of Xenon Xe 133 Gas has proved valuable for the evaluation of pulmonary function and for imaging the lungs. It may also be applied to assessment of cerebral flow.


Xenon Xe 133 is a readily diffusible gas which is neither utilized nor produced by the body. It passes through cell membranes and freely exchanges between blood and tissue. It tends to concentrate more in body fat than in blood, plasma, water or protein solutions.

Mechanism of action

Xenon-133 is used for the diagnostic evaluation of pulmonary function and imaging, as well as assessment of cerebral blood flow. In the concentrations used for diagnostic purposes it is physiologically inactive.


Inhaled Xenon Xe 133 Gas will enter the alveolar wall and enter the pulmonary venous circulation via the capillaries.

Protein binding

Information currently not available.

Volume of distribution

Information currently not available.


Information currently not available.

Half life

Half Life 5.245 days

Route of elimination

Most of the Xenon Xe 133 that enters the circulation from a single breath is returned to the lungs and exhaled after a single pass through the peripheral circulation.


Information currently not available.

Adverse Effects


Information currently not available.

Food Interactions

    Information currently not available.


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  • Paracetamol(acetaminophen)
  • Paxil(paroxetine)
  • Pamelor(nortriptyline)
  • Panadol(acetaminophen)
  • Patanol(olopatadine ophthalmic)
  • Pataday(olopatadine ophthalmic)
  • Parnate(tranylcypromine)
  • Pazeo(olopatadine ophthalmic)
1 References
  1. 1 . FDA label Link