Iobitridol

Iobitridol (trade name Xenetix) is a pharmaceutical drug used as a radiocontrast agent in X-ray imaging.[1] It is injected into blood vessels, joints, or body cavities such as the uterus, and filtered out by the kidneys.[2] Its most common adverse effect is nausea. Severe allergic reactions are rare.[1][2]

Iobitridol
Clinical data
Trade namesXenetix
AHFS/Drugs.comUK Drug Information
Routes of
administration		Intravenous, joint injection, instillation into body cavities
ATC code
Legal status
Legal status
  • UK: POM (Prescription only)
Pharmacokinetic data
Protein binding~2%
Metabolismnone
Elimination half-life1.8 hours
Excretionunchanged via kidneys
Identifiers
  • 1-N,3-N-bis(2,3-dihydroxypropyl)-5-[3-hydroxy-2-(hydroxymethyl)propanamido]-2,4,6-triiodo-1-N,3-N-dimethylbenzene-1,3-dicarboxamide
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC20H28I3N3O9
Molar mass835.169 g·mol−1
3D model (JSmol)
  • CN(CC(CO)O)C(=O)c1c(c(c(c(c1I)NC(=O)C(CO)CO)I)C(=O)N(C)CC(CO)O)I
  • InChI=1S/C20H28I3N3O9/c1-25(3-10(31)7-29)19(34)12-14(21)13(20(35)26(2)4-11(32)8-30)16(23)17(15(12)22)24-18(33)9(5-27)6-28/h9-11,27-32H,3-8H2,1-2H3,(H,24,33) ☒N
  • Key:YLPBXIKWXNRACS-UHFFFAOYSA-N ☒N
 ☒NcheckY (what is this?)  (verify)

The drug received its first marketing approval in 1994 in France[3] and is approved for use in many European countries including the UK,[4] but not in the US.[1] It is manufactured by Guerbet.[3]

Medical uses

Iobitridol is used for intravenous urography (imaging of the urinary system via a vein), angiography (imaging of blood vessels), angiocardiography (heart and coronary arteries), arthrography (joints), hysterosalpingography (uterus and Fallopian tubes), and imaging of the cranium and the whole body.[2] It is approved for use in adults and children.[5]

Contraindications

The drug is contraindicated in people with manifest hyperthyreosis because of its iodine content. It must not be used to image the uterus or Fallopian tubes in pregnant women.[2][6]

Adverse effects

Iobitridol is generally well tolerated.[5] The only side effect observed in more than 1% of patients is nausea. Rare side effects (in fewer than 1 per 10.000 people) include anaphylaxis (severe allergic reactions), circulatory collapse, kidney failure, thyroid-related effects, and skin reactions such as Stevens–Johnson syndrome. Rare side effects in brain imaging include convulsions, transient sight disorders, memory loss, and coma.[2][6]

Overdose

Overdosing is unlikely. It is managed by rehydration therapy and monitoring of the kidney function for at least three days. If necessary, iobitridol can be removed from the body by haemodialysis.[2][6]

Interactions

Drug interactions are the same as with other iodine-containing contrast agents: patients taking diuretics are at a higher risk of developing kidney failure under iobitridol unless they receive a water and electrolyte infusion before imaging.[2] As the diabetes drug metformin is eliminated via the kidneys, it is recommended that people with severe kidney impairment should pause metformin during and after they are given iobitridol.[7]

Certain antihypertensive (blood pressure lowering) drugs such as beta-blockers, ACE inhibitors, and sartans can prevent the heart from compensating for low blood pressure, with an increased risk of circulatory collapse. Iodine-131, a radioactive isotope used for thyroid imaging (scintigraphy) and therapy of thyroid cancers, can be less effective when used within several weeks after the application of iobitridol because of residual iodine in the body.[2]

Interleukin 2 cancer therapy has been thought to result in more severe side effects than iobitridol,[2] but a 2009 literature search has found no such risk.[8]

Pharmacology

Mechanism of action
CT scan of three brain metastases from breast cancer. Before (left image) and after (right image) injection of an iodinated contrast agent similar to iobitridol.
Further information: Iodinated contrast

Iobitridol is an iodine-containing radiocontrast agent.[2][5] The iodine atoms readily absorb X-rays, resulting in better contrast in radiography images.[9] The quality of images made with this drug is equally good as with other low– or medium–osmolarity iodinated contrast agents such as iopamidol or iohexol.[5]

Pharmacokinetics

After intravenous infusion, iobitridol is distributed in the circulatory system and the interstitium. The substance is only marginally bound to blood plasma proteins (to about 2%) and membrane proteins because the hydrophilic side chains of the molecule efficiently mask the central iodinated benzene ring. It is not metabolized but eliminated in the unchanged form via the kidneys by glomerular filtration without active secretion or reabsorption. The elimination half-life is 1.8 hours.[2][5]

In people with kidney failure, the substance is instead eliminated via the bile duct.[2]

Chemistry

Of the molecular mass, 45.6% is contributed by the three iodine atoms. Iobitridol is nonionic but water-soluble,[1] having some OH groups in its side chains designed to mask the central hydrophobic benzene ring.[5]

The solution has a low osmolarity of 695 (Xenetix 300) or 915 mOsm/kg H2O (Xenetix 350), which means it causes fewer allergic and allergy-like reactions, as well as less extravasation (leakage of blood vessels) than contrast agents with higher osmolarities.[2][5][10]

References
  1. Cheng KT (2004). "5-(3-Hydroxy-2-hydroxymethyl-propionamido)-N,N´-dimethyl-N,N´-bis-(2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide". Molecular Imaging and Contrast Agent Database (MICAD) [Internet]. PMID 20641966.
  2. Haberfeld H, ed. (2020). Austria-Codex (in German). Vienna: Österreichischer Apothekerverlag. Xenetix 300 (300 mg Jod/ml)-Parenterale Röntgenkontrastmittellösung.
  3. "Xenetix / ScanBag by Xenetix (Iobitridol)". Guerbet. Retrieved 2021-03-19.
  4. "Iobitridol: List of nationally authorised medicinal products - PSUSA/00001761/201904" (PDF). European Medicines Agency. 2020-04-03.
  5. McCormack PL (February 2013). "Iobitridol: a review of its use as a contrast medium in diagnostic imaging". Clinical Drug Investigation. 33 (2): 155–66. doi:10.1007/s40261-013-0055-3. PMID 23341290.
  6. Xenetix 300 (300 mgI/ml) Solution for Injection: UK Drug Information. Accessed 2021-03-18.
  7. American College of Radiology (2021). "ACR Manual on Contrast Media" (PDF). pp. 45–46.
  8. Boehm I (September 2009). "Is interleukin-2 therapy still a risk factor for adverse reactions in concert with iodinated contrast medium injection?". Acta Radiologica. 50 (7): 752–3. doi:10.1080/02841850903061452. PMID 19629773. S2CID 44833077.
  9. Bae KT (July 2010). "Intravenous contrast medium administration and scan timing at CT: considerations and approaches". Radiology. 256 (1): 32–61. doi:10.1148/radiol.10090908. PMID 20574084.
  10. Haberfeld H, ed. (2020). Austria-Codex (in German). Vienna: Österreichischer Apothekerverlag. Xenetix 350 (350 mg Jod/ml)-Parenterale Röntgenkontrastmittellösung.
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