Chemical Component Summary

Name4-methyl-1H-pyrazole
Identifiers4-methyl-1H-pyrazole
FormulaC4 H6 N2
Molecular Weight82.10
TypeNON-POLYMER
Isomeric SMILESCc1cn[nH]c1
InChIInChI=1S/C4H6N2/c1-4-2-5-6-3-4/h2-3H,1H3,(H,5,6)
InChIKeyRIKMMFOAQPJVMX-UHFFFAOYSA-N

Chemical Details

Formal Charge0
Atom Count12
Chiral Atom Count0
Chiral Atomsn/a
Bond Count12
Aromatic Bond Count5
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB01213 Different stereochemistry
NameFomepizole
Groups
  • approved
  • vet_approved
DescriptionFomepizole is used as an antidote in confirmed or suspected methanol or ethylene glycol poisoning. Fomepizole is a competitive inhibitor of alcohol dehydrogenase, the enzyme that catalyzes the initial steps in the metabolism of ethylene glycol and methanol to their toxic metabolites.
Synonyms
  • 4-Methylpyrazol
  • 4-methylpyrazole
  • Antizol
  • Fomepizol
  • Fomepizole
Brand Names
  • Antizol
  • Fomepizole
  • Fomepizole for Injection
Affected OrganismHumans and other mammals
IndicationAntizol is indicated as an antidote for ethylene glycol (such as antifreeze) or methanol poisoning, or for use in suspected ethylene glycol or methanol ingestion, either alone or in combination with hemodialysis
PharmacologyFomepizole is a competitive inhibitor of alcohol dehydrogenase, the enzyme that catalyzes the initial steps in the metabolism of ethylene glycol and methanol to their toxic metabolites. Ethylene glycol is first metabolized to glycoaldehyde which then undergoes further oxidation to glycolate, glyoxylate, and oxalate. It is glycolate and oxalate that are primarily responsible for the metabolic acidosis and renal damage that are seen in ethylene glycol poisoning. {01}{03} Methanol is first metabolized to formaldehyde and then undergoes subsequent oxidation via formaldehyde dehydrogenase to become formic acid. It is formic acid that is primarily responsible for the metabolic acidosis and visual disturbances that are associated with methanol poisoning.
Mechanism of actionAntizol (fomepizole) is a competitive inhibitor of alcohol dehydrogenase. Alcohol dehydrogenase catalyzes the oxidation of ethanol to acetaldehyde. Alcohol dehydrogenase also catalyzes the initial steps in the metabolism of ethylene glycol and methanol to their toxic metabolites.
Route of administrationIntravenous
Categories
  • Antidotes
  • Azoles
  • Chemical Actions and Uses
  • Cytochrome P-450 CYP2A6 Inhibitors
  • Cytochrome P-450 CYP2E1 Inhibitors
ATC-CodeV03AB34
AHFS-Code92:00.00
CAS number7554-65-6
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682