Date published: 2025-11-3

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Fomepizole (CAS 7554-65-6)

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Alternate Names:
4-Methylpyrazole; Antizol
Application:
Fomepizole is an alcohol dehydrogenase inhibitor
CAS Number:
7554-65-6
Purity:
≥97%
Molecular Weight:
82.10
Molecular Formula:
C4H6N2
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Fomepizole is an ADH(alcohol dehydrogenase) inhibitor. This can be used as an antidote in methanol and ethylene glycol poisoning. Also inhibits CYP2E1 activity. In addition, 4-methylpyrazole inhibits the enzyme glycol dehydrogenase which breaks down glycols into harmless components. This leads to an accumulation of toxic intermediate products that are converted back into glycols.


Fomepizole (CAS 7554-65-6) References

  1. Role of fomepizole in the management of ethylene glycol toxicity.  |  Druteika, DP., et al. 2002. Pharmacotherapy. 22: 365-72. PMID: 11899949
  2. Fomepizole as an antidote for ethylene glycol poisoning.  |  Battistella, M. 2002. Ann Pharmacother. 36: 1085-9. PMID: 12022913
  3. Fomepizole: a critical assessment of current dosing recommendations.  |  Bestic, M., et al. 2009. J Clin Pharmacol. 49: 130-7. PMID: 19004845
  4. Fomepizole for the treatment of pediatric ethylene and diethylene glycol, butoxyethanol, and methanol poisonings.  |  Brent, J. 2010. Clin Toxicol (Phila). 48: 401-6. PMID: 20586570
  5. Use of fomepizole, n-acetylcysteine, and hemodialysis for massive acetaminophen overdose.  |  Woolum, JA., et al. 2020. Am J Emerg Med. 38: 692.e5-692.e7. PMID: 31785980
  6. Fomepizole to treat disulfiram-ethanol reaction: a case series.  |  Schicchi, A., et al. 2020. Clin Toxicol (Phila). 58: 922-925. PMID: 31878796
  7. Fomepizole dosing during continuous renal replacement therapy - an observational study.  |  Lao, YE., et al. 2022. Clin Toxicol (Phila). 60: 451-457. PMID: 34585641
  8. Fomepizole as an adjunct in acetylcysteine treated acetaminophen overdose patients: a case series.  |  Link, SL., et al. 2022. Clin Toxicol (Phila). 60: 472-477. PMID: 34709101
  9. Use of fomepizole (4-methylpyrazole) for acetaminophen poisoning: A scoping review.  |  Pourbagher-Shahri, AM., et al. 2022. Toxicol Lett. 355: 47-61. PMID: 34785186
  10. Comparing N-acetylcysteine and 4-methylpyrazole as antidotes for acetaminophen overdose.  |  Akakpo, JY., et al. 2022. Arch Toxicol. 96: 453-465. PMID: 34978586
  11. Fomepizole should not be used more liberally in paracetamol overdose.  |  Dear, JW. 2023. Br J Clin Pharmacol. 89: 599-601. PMID: 36471568
  12. Fomepizole should be used more liberally in paracetamol overdose.  |  Filip, AB. and Mullins, ME. 2023. Br J Clin Pharmacol. 89: 594-598. PMID: 36471569
  13. Fomepizole as an emerging adjunct in treating severe acetaminophen toxicity: a case report and a brief review.  |  Kusnik, A., et al. 2022. J Gastrointestin Liver Dis. 31: 481-482. PMID: 36535058

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Fomepizole, 1 g

sc-252838
1 g
$74.00

What is the solubility of this product?

Asked by: hawkeye11
Thank you for your question. This molecule is soluble in water, alcohol and mineral acid. Unfortunately, the exact amounts of product to solvent is not characterized.
Answered by: Technical Support
Date published: 2017-01-24
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Rated 5 out of 5 by from QuangQuang, LS. et al. (PubMed 12074936) reported that pretreatment of CD-1 mice with Fomepizole blocks toxicity from the gamma-hydroxybutyrate precursor, 1,4-butanediol. -SCBT Publication Review
Date published: 2015-03-14
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Fomepizole is rated 5.0 out of 5 by 1.
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