Technetium (99mTc) exametazime

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Technetium (99mTc) exametazime
Tc-99m exametazime skeletal.svg
Clinical data
Trade namesCeretec
License data
  • US: C (Risk not ruled out)
Routes of
ATC code
Legal status
Legal status
CAS Number
PubChem CID
Chemical and physical data
Molar mass383.37 g·mol−1
3D model (JSmol)
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Technetium (99mTc) exametazime is a radiopharmaceutical sold under the trade name Ceretec, and is used by nuclear medicine physicians for the detection of altered regional cerebral perfusion in stroke[1] and other cerebrovascular diseases. It can also be used for the labelling of leukocytes to localise intra-abdominal infections[2] and inflammatory bowel disease.[3] Exametazime (the part without technetium) is sometimes referred to by its chemical name of hexamethylpropyleneamine oxime or HMPAO.


One of the two enantiomers of exametazime (hexamethylpropyleneamine oxime, HMPAO)

The drug consists of exametazime as a chelating agent for the radioisotope technetium-99m. Both enantiomeric forms of exametazime are used—the drug is racemic.[4] The third stereoisomer of this structure, the meso form, is not included.


  1. ^ Moretti, J. L.; Defer, G.; Cinotti, L.; Cesaro, P.; Degos, J. D.; Vigneron, N.; Ducassou, D.; Holman, B. L. (1990). ""Luxury perfusion" with 99mTc-HMPAO and 123I-IMP SPECT imaging during the subacute phase of stroke". European journal of nuclear medicine. 16 (1): 17–22. doi:10.1007/BF01566007. PMID 2307169.
  2. ^ Weldon, M. J.; Joseph, A. E.; French, A.; Saverymuttu, S. H.; Maxwell, J. D. (1995). "Comparison of 99m technetium hexamethylpropylene-amine oxime labelled leucocyte with 111-indium tropolonate labelled granulocyte scanning and ultrasound in the diagnosis of intra-abdominal abscess". Gut. 37 (4): 557–564. doi:10.1136/gut.37.4.557. PMC 1382910. PMID 7489945.
  3. ^ Ui, K.; Yamaguchi, T. (1991). "Therapy and diagnosis of emergency shock patients". Nihon Naika Gakkai zasshi. the Journal of the Japanese Society of Internal Medicine. 80 (12): 1892–1896. PMID 1804909.
  4. ^ Monography in the European Pharmacopoeia

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