NAV

Metamizole

Overview

Description
A drug used to treat severe and persistent fever and pain.
Description
A drug used to treat severe and persistent fever and pain.
DrugBank ID
DB04817
Type
Small Molecule
US Approved
NO
Other Approved
YES
Clinical Trials
Phase 0
0
Phase 1
3
Phase 2
8
Phase 3
11
Phase 4
20
Mechanism of Action

Identification

Summary

Metamizole is an antipyretic and analgesic drug used to relieve severe and persistent fever and pain.

Generic Name
Metamizole
DrugBank Accession Number
DB04817
Background

Metamizole (dipyrone) is a pyrazolone derivative that belongs to the group of nonacid nonopioids. It is considered a potent analgesic and antipyretic with favourable gastrointestinal tolerability.2 Metamizole was formerly marketed in the US as Dimethone tablets and injection, Protemp oral liquid, and other drug products, and was withdrawn due to its association with potentially fatal agranulocytosis. Approvals of the NDA's for metamizole drug products were withdrawn on June 27, 1977 (see the Federal Register of June 17, 1977, 42 FR 30893).9 In 1963, metamizole was withdrawn from the Canadian market and banned in the UK, France, Sweden, Norway and Australia.1 Metamizole is still used in certain countries in Europe, Asia and South America.1

Type
Small Molecule
Groups
Approved, Investigational, Withdrawn
Structure

Structure for Metamizole (DB04817)

Weight
Average: 311.36
Monoisotopic: 311.093977213
Chemical Formula
C13H17N3O4S
Synonyms
  • Dipyrone
  • Metamizol

Pharmacology

Indication

Metamizole is banned in several countries, where it was previously used as a powerful analgesic and fever reducer. In countries where it is still available, metamizole is indicated for acute severe pain after injuries or surgeries, colic, tumor pain, and acute or severe pain symptoms, as well as high fever if other treatments are unsuccessful.1

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Associated Conditions
Indication TypeIndicationCombined Product DetailsApproval LevelAge GroupPatient CharacteristicsDose Form
Symptomatic treatment ofSevere pain••••••••••••
Symptomatic treatment ofSevere fever••••••••••••
Contraindications & Blackbox Warnings
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Pharmacodynamics

Metamizole is a strong analgesic and antipyretic with spasmolytic properties. It has weak anti-inflammatory or antithrombotic properties and does not follow the same mechanism of action as conventional non-steroidal anti-inflammatory drugs (NSAIDs).1 Metamizole can lead to agranulocytosis, a life-threatening side effect where a patient’s neutrophil count falls below 500 cells per microliter.1 It has been shown that metamizole-induced agranulocytosis is caused by the development of drug-dependent anti-neutrophil antibodies requiring covalent binding of neutrophils to metamizole and its metabolites.2

Mechanism of action

The mechanism of action of metamizole is not fully understood. Its active metabolites, 4-methyl-amino-antipyrine (MAA) and 4-amino-antipyrine (AA), inhibit prostaglandin E2 (PGE2)-induced hyperalgesia.7 It has been suggested that the anti-hyperalgesic effect of MAA is mediated by guanosine 3',5'-cyclic monophosphate (cGMP) activation and ATP-sensitive potassium channel opening, while the effects of AA are associated with the activation of cannabinoid receptor type 1 (CB1).7 Metamizole is classified in some sources as a weak non-steroidal anti-inflammatory drug (NSAID);2 however, evidence suggests that its analgesic effects do not depend on its anti-inflammatory properties.7 Although the inhibition of cyclooxygenase (COX) 2 may play a role in the central nervous system effects of metamizole,7 reports suggest that metamizole inhibits COX-3 with a higher affinity compared to COX-1 or COX-2.6,8

TargetActionsOrganism
AProstaglandin G/H synthase 1
inhibitor
Humans
Absorption

Metamizole is hydrolyzed to 4-methyl-amino-antipyrine (MAA) in gastric juice and is mostly absorbed in this form. MAA bioavailability differs based on the administration route. In patients given metamizole tablets, the bioavailability of MAA is 85%, in patients given drops, 89%, in patients given suppositories, 54%, and in patients given an intramuscular injection, 87%.3 There is a linear relationship between metamizole oral dose and MAA Cmax. After oral doses ranging between 0.75 and 3 g, the tmax is reached at 1.4-2.0 hours.3

Volume of distribution

Metamizole is quickly metabolized into 4-methyl-amino-antipyrine (MAA), its active metabolite. MAA has a volume of distribution of 1.15 L/kg.3

Protein binding

The protein binding of metamizole and its metabolites is low, with an average of 60% for the metabolites 4-methyl-amino-antipyrine, 4-formyl-amino-antipyrine, 4-amino-antipyrine and 4-acetyl-amino-antipyrine.3,4

Metabolism

Metamizole undergoes rapid hydrolysis to the active moiety 4-methyl-amino-antipyrine (MAA). MAA is then metabolized to 4-formyl-amino-antipyrine (FAA) via c-oxidation and 4-amino-antipyrine (AA) via N-demethylation. The N-demethylation of MAA is mainly mediated by CYP3A4, although CYP2B6, CYP2C8 and CYP2C9 may also be involved.2 FAA is an end metabolite, while AA is acetylated by N-acetyl-transferase to form 4-acetyl-amino-antipyrine (AAA).3 The unchanged drug may be present in plasma following the intravenous administration of metamizole; however, following oral administration, it cannot be detected in plasma or urine.3

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Route of elimination

After intravenous or oral administration, 90% of metamizole is recovered in urine, while 10% is recovered in feces.3 Approximately 60% of four metamizole metabolites (4-methyl-amino-antipyrine, 4-formyl-amino-antipyrine, 4-amino-antipyrine and 4-acetyl-amino-antipyrine) are excreted through urine.3

Half-life

In vitro, the half-life of metamizole is 16 minutes. The half-life of 4-methyl-amino-antipyrine (MAA), its active metabolite, ranges from 2.6 to 3.5 hours.3

Clearance

The clearance of 4-methyl-amino-antipyrine (MAA), the active metabolite of metamizole, ranges from 110 mL/min to 180 mL/min after oral administration.3

Adverse Effects
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Toxicity

A metamizole overdose (7.5 g) may lead to gastrointestinal toxicity. If less than an hour has passed since metamizole ingestion, gastrointestinal decontamination and supportive measures are suggested as overdose treatment.5 Metamizole can also cause myelotoxicity, leading to drug-induced agranulocytosis.2,6

Pathways
Not Available
Pharmacogenomic Effects/ADRs
Not Available

Interactions

Drug Interactions
This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.
DrugInteraction
Integrate drug-drug
interactions in your software
AbacavirMetamizole may decrease the excretion rate of Abacavir which could result in a higher serum level.
AcebutololMetamizole may decrease the antihypertensive activities of Acebutolol.
AceclofenacThe risk or severity of nephrotoxicity can be increased when Metamizole is combined with Aceclofenac.
AcemetacinThe risk or severity of nephrotoxicity can be increased when Metamizole is combined with Acemetacin.
AcetaminophenMetamizole may decrease the excretion rate of Acetaminophen which could result in a higher serum level.
Food Interactions
Not Available

Products

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Product Ingredients
IngredientUNIICASInChI Key
Metamizole magnesiumMS156427256150-97-6NHMUJYOBLYTIKO-UHFFFAOYSA-L
Metamizole sodiumVSU62Z74ON68-89-3DJGAAPFSPWAYTJ-UHFFFAOYSA-M
Metamizole sodium monohydrate6429L0L52Y5907-38-0UNZIDPIPYUMVPA-UHFFFAOYSA-M
International/Other Brands
Algocalmin /Algozone /Analgin /Dimethone /Dipirona /Neo-Melubrina /Novalgin /Optalgin /Protemp /Pyralgin
Mixture Products
NameIngredientsDosageRouteLabellerMarketing StartMarketing EndRegionImage
ANALSIKMetamizole sodium(500 mg) +Diazepam(2 mg)Tablet, film coatedOralSanbe Farma2019-08-202024-06-02Indonesia flag
ANTIALGINA®Metamizole sodium(300 mg) +Caffeine(30 mg) +Isometheptene mucate(30 mg)Tablet, film coatedOralTECNOQUIMICAS S.A.2007-04-24Not applicableColombia flag
ANTIALGINA®Metamizole sodium(300 mg) +Caffeine(30 mg) +Isometheptene(50 mg)SolutionOralTECNOFAR TQ S.A.S2007-03-062015-02-27Colombia flag
BUSCAPINA® COMPOSITUM AMPOLLASMetamizole sodium(2.5 g) +Butylscopolamine bromide(0.02 g)SolutionIntramuscular; IntravenousBOEHRINGER INGELHEIM ESPAŃA S.A.2006-11-102020-06-01Colombia flag
CAFETRIN ®Metamizole(300 mg) +Caffeine(30 mg) +Isometheptene mucate(30 mg)Tablet, coatedOralLABORATORIOS RICH MONDS S.A.S2018-05-11Not applicableColombia flag

Categories

ATC Codes
N02BB72 — Metamizole sodium, combinations with psycholepticsN02BB02 — Metamizole sodiumN02BB52 — Metamizole sodium, combinations excl. psycholeptics
Drug Categories
Classification
Not classified
Affected organisms
  • Humans and other mammals

Chemical Identifiers

UNII
934T64RMNJ
CAS number
50567-35-6
InChI Key
LVWZTYCIRDMTEY-UHFFFAOYSA-N
InChI
InChI=1S/C13H17N3O4S/c1-10-12(14(2)9-21(18,19)20)13(17)16(15(10)3)11-7-5-4-6-8-11/h4-8H,9H2,1-3H3,(H,18,19,20)
IUPAC Name
[(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)(methyl)amino]methanesulfonic acid
SMILES
CN(CS(O)(=O)=O)C1=C(C)N(C)N(C1=O)C1=CC=CC=C1

References

General References
  1. Cascorbi I: The Uncertainties of Metamizole Use. Clin Pharmacol Ther. 2021 Jun;109(6):1373-1375. doi: 10.1002/cpt.2258. [Article]
  2. Lutz M: Metamizole (Dipyrone) and the Liver: A Review of the Literature. J Clin Pharmacol. 2019 Nov;59(11):1433-1442. doi: 10.1002/jcph.1512. Epub 2019 Aug 21. [Article]
  3. Levy M, Zylber-Katz E, Rosenkranz B: Clinical pharmacokinetics of dipyrone and its metabolites. Clin Pharmacokinet. 1995 Mar;28(3):216-34. doi: 10.2165/00003088-199528030-00004. [Article]
  4. Zylber-Katz E, Granit L, Levy M: Plasma protein binding of dipyrone metabolites in man. Eur J Clin Pharmacol. 1985;29(1):67-71. doi: 10.1007/BF00547371. [Article]
  5. Bentur Y, Cohen O: Dipyrone overdose. J Toxicol Clin Toxicol. 2004;42(3):261-5. doi: 10.1081/clt-120037425. [Article]
  6. Jasiecka A, Maslanka T, Jaroszewski JJ: Pharmacological characteristics of metamizole. Pol J Vet Sci. 2014;17(1):207-14. doi: 10.2478/pjvs-2014-0030. [Article]
  7. dos Santos GG, Dias EV, Teixeira JM, Athie MC, Bonet IJ, Tambeli CH, Parada CA: The analgesic effect of dipyrone in peripheral tissue involves two different mechanisms: neuronal K(ATP) channel opening and CB(1) receptor activation. Eur J Pharmacol. 2014 Oct 15;741:124-31. doi: 10.1016/j.ejphar.2014.07.019. Epub 2014 Jul 21. [Article]
  8. Chandrasekharan NV, Dai H, Roos KL, Evanson NK, Tomsik J, Elton TS, Simmons DL: COX-3, a cyclooxygenase-1 variant inhibited by acetaminophen and other analgesic/antipyretic drugs: cloning, structure, and expression. Proc Natl Acad Sci U S A. 2002 Oct 15;99(21):13926-31. Epub 2002 Sep 19. [Article]
  9. FDA Federal Register: List of Drug Products That Have Been Withdrawn or Removed From the Market for Reasons of Safety or Effectiveness [Link]
External Links
KEGG Drug
D08188
PubChem Compound
522325
PubChem Substance
46509035
ChemSpider
3000
BindingDB
235671
RxNav
3523
ChEBI
62088
ChEMBL
CHEMBL461522
ZINC
ZINC000001782155
Therapeutic Targets Database
DNC000568
PharmGKB
PA166128206
Wikipedia
Metamizole

Clinical Trials

Clinical Trials
Clinical Trial & Rare Diseases Add-on Data Package
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PhaseStatusPurposeConditionsCountStart DateWhy Stopped100+ additional columns
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Not AvailableCompletedNot AvailableAnesthesia Morbidity/Obesity, Morbid/Opioids Use/Pharmacological Action (PA)/Postoperative pain1somestatusstop reasonjust information to hide
Not AvailableCompletedNot AvailableAnesthetics Adverse Reaction/Anxiety/Craniotomy/Postoperative pain1somestatusstop reasonjust information to hide
Not AvailableCompletedNot AvailablePostoperative pain1somestatusstop reasonjust information to hide
Not AvailableCompletedBasic SciencePlatelet Aggregation1somestatusstop reasonjust information to hide
Not AvailableCompletedDiagnosticLumbar Disc Disease1somestatusstop reasonjust information to hide

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Pharmacoeconomics

Manufacturers
Not Available
Packagers
  • Zhejiang Haisen Pharmaceutical Co. Ltd.
Dosage Forms
FormRouteStrength
Injection, solutionIntramuscular; Intravenous2.5 g/5ml
Injection, solutionParenteral1000 mg
SyrupOral50 mg/mL
SyrupOral250 mg/5ml
TabletOral
SolutionOral
SolutionIntramuscular1.000 g
TabletOral500.00 mg
SolutionParenteral1.0000 g
Solution / dropsOral15 ml
TabletOral500 mg/1
SuppositoryRectal1000 MG
SolutionParenteral20.000 mg
SolutionParenteral
SuppositoryRectal
SolutionIntramuscular; Intravenous
SolutionIntravenous
SyrupOral3 g
TabletOral5 g
Injection, solutionIntramuscular; Intravenous
SolutionIntramuscular; Intravenous
SolutionParenteral2.5 g
InjectionParenteral1 g
SolutionIntramuscular1 g
Tablet, coatedOral500 mg
SolutionParenteral2000 mg
InjectionIntramuscular; Intravenous2 g
SolutionIntramuscular; Intravenous2 g
SolutionParenteral2 g
SolutionIntramuscular; Intravenous1 g
SolutionIntramuscular; Intravenous; Subcutaneous2.5 g
InjectionIntramuscular; Intravenous2500 mg
TabletOral0.5 g
SolutionParenteral2.50 g
SolutionIntramuscular1.0 g
TabletOral
InjectionParenteral
Capsule, coatedOral
Tablet, coatedOral
TabletOral5.00 g
Injection, solutionIntramuscular; Intravenous1000 mg/2ml
SyrupOral
TabletOral10 mg
InjectionIntravenous
SolutionOral0.5 g
SolutionIntramuscular200.000 mg
SolutionIntramuscular2.5 g
SolutionIntravenous; Parenteral2.5 g
SolutionParenteral1 g
SolutionParenteral2.000 g
Injection, solutionParenteral1.0 g
Tablet, film coatedOral1000 mg
SolutionOral500 MG/ML
Injection, solutionParenteral500 mg/ml
Tablet, film coatedOral500 MG
Injection, solutionParenteral7.5 mg
Injection
Injection500 mg
Solution / dropsOral
Tablet, film coatedOral2 mg
TabletOral5 mg
TabletOral25.000 g
TabletOral5.000 g
SolutionIntramuscular
SolutionOral300 mg
SolutionOral96 mg
Tablet, film coatedOral50 mg
Tablet
Tablet, film coatedOral500 mg
Tablet; tablet, film coatedOral
InjectionIntramuscular; Intravenous1 gr/2ml
InjectionIntramuscular; Intravenous2.5 gr/5ml
Solution / drops; suspension / drops250 mg/ml
Ointment
Injection, solutionIntramuscular; Intravenous1 gr/2ml
Injection500 mg/ml
SuppositoryRectal300 mg
Injection, solutionIntramuscular; Intravenous500 mg/ml
Injection, solutionParenteral2.5 G
SyrupOral250 mg/ml
Injection, solutionIntramuscular; Intravenous1 G/2ML
Solution / dropsOral500 MG/ML
SuppositoryRectal1 G
TabletOral500 MG
SolutionIntramuscular; Intravenous2.5 g
SolutionOral500 MG
Injection, solutionParenteral1 G/2ML
InjectionIntramuscular; Intravenous
InjectionIntramuscular; Intravenous1 g/2ml
SolutionParenteral50.000 mg
SolutionOral5.0 g
TabletOral500.000 mg
Tablet, coatedOral850 mg
SolutionParenteral0.020 g
Injection1 g
Injection2 g
SolutionParenteral0.02 g
SolutionOral500.000 mg
SolutionOral500.00000 mg
Tablet, film coatedOral
Tablet, sugar coatedOral
SolutionParenteral500 mg
SolutionParenteral1.000 g
Prices
Not Available
Patents
Not Available

Properties

State
Solid
Experimental Properties
Not Available
Predicted Properties
PropertyValueSource
Water Solubility2.53 mg/mLALOGPS
logP-0.4ALOGPS
logP-0.82Chemaxon
logS-2.1ALOGPS
pKa (Strongest Acidic)-1.4Chemaxon
pKa (Strongest Basic)-0.54Chemaxon
Physiological Charge-1Chemaxon
Hydrogen Acceptor Count6Chemaxon
Hydrogen Donor Count1Chemaxon
Polar Surface Area81.16 Å2Chemaxon
Rotatable Bond Count4Chemaxon
Refractivity80.04 m3·mol-1Chemaxon
Polarizability31.41 Å3Chemaxon
Number of Rings2Chemaxon
Bioavailability1Chemaxon
Rule of FiveYesChemaxon
Ghose FilterNoChemaxon
Veber's RuleNoChemaxon
MDDR-like RuleNoChemaxon
Predicted ADMET Features
PropertyValueProbability
Human Intestinal Absorption+0.7868
Blood Brain Barrier+0.8896
Caco-2 permeable-0.5869
P-glycoprotein substrateNon-substrate0.8148
P-glycoprotein inhibitor INon-inhibitor0.828
P-glycoprotein inhibitor IINon-inhibitor0.8107
Renal organic cation transporterNon-inhibitor0.921
CYP450 2C9 substrateNon-substrate0.8588
CYP450 2D6 substrateNon-substrate0.7959
CYP450 3A4 substrateSubstrate0.6035
CYP450 1A2 substrateNon-inhibitor0.7153
CYP450 2C9 inhibitorNon-inhibitor0.7064
CYP450 2D6 inhibitorNon-inhibitor0.8562
CYP450 2C19 inhibitorNon-inhibitor0.6768
CYP450 3A4 inhibitorNon-inhibitor0.9297
CYP450 inhibitory promiscuityLow CYP Inhibitory Promiscuity0.8506
Ames testAMES toxic0.7763
CarcinogenicityCarcinogens0.8197
BiodegradationReady biodegradable0.7192
Rat acute toxicity2.6224 LD50, mol/kgNot applicable
hERG inhibition (predictor I)Weak inhibitor0.8411
hERG inhibition (predictor II)Non-inhibitor0.6724
ADMET data is predicted usingadmetSAR, a free tool for evaluating chemical ADMET properties. (23092397)

Spectra

Mass Spec (NIST)
Not Available
Spectra
SpectrumSpectrum TypeSplash Key
Predicted MS/MS Spectrum - 10V, Negative (Annotated)Predicted LC-MS/MSsplash10-03di-1009000000-431728299201b0fb868d
Predicted MS/MS Spectrum - 10V, Positive (Annotated)Predicted LC-MS/MSsplash10-03di-0019000000-b8d7405e368fa22b6915
Predicted MS/MS Spectrum - 20V, Negative (Annotated)Predicted LC-MS/MSsplash10-01q9-9004000000-79f614717a7a99cafbbd
Predicted MS/MS Spectrum - 20V, Positive (Annotated)Predicted LC-MS/MSsplash10-014i-0390000000-eb45759e184b23c05705
Predicted MS/MS Spectrum - 40V, Negative (Annotated)Predicted LC-MS/MSsplash10-001l-9220000000-2c0ed857809190b300d8
Predicted MS/MS Spectrum - 40V, Positive (Annotated)Predicted LC-MS/MSsplash10-000f-3930000000-f710a44ca4cfcfa52e2a
Predicted 1H NMR Spectrum1D NMRNot Applicable
Predicted 13C NMR Spectrum1D NMRNot Applicable
Chromatographic Properties
Collision Cross Sections (CCS)
AdductCCS Value (Å2)Source typeSource
[M-H]-172.57713
predicted
DeepCCS 1.0 (2019)
[M+H]+174.93513
predicted
DeepCCS 1.0 (2019)
[M+Na]+181.58745
predicted
DeepCCS 1.0 (2019)

Targets

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Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Inhibitor
General Function
Dual cyclooxygenase and peroxidase that plays an important role in the biosynthesis pathway of prostanoids, a class of C20 oxylipins mainly derived from arachidonate ((5Z,8Z,11Z,14Z)-eicosatetraenoate, AA, C20:4(n-6)), with a particular role in the inflammatory response. The cyclooxygenase activity oxygenates AA to the hydroperoxy endoperoxide prostaglandin G2 (PGG2), and the peroxidase activity reduces PGG2 to the hydroxy endoperoxide prostaglandin H2 (PGH2), the precursor of all 2-series prostaglandins and thromboxanes. This complex transformation is initiated by abstraction of hydrogen at carbon 13 (with S-stereochemistry), followed by insertion of molecular O2 to form the endoperoxide bridge between carbon 9 and 11 that defines prostaglandins. The insertion of a second molecule of O2 (bis-oxygenase activity) yields a hydroperoxy group in PGG2 that is then reduced to PGH2 by two electrons (PubMed:7947975). Involved in the constitutive production of prostanoids in particular in the stomach and platelets. In gastric epithelial cells, it is a key step in the generation of prostaglandins, such as prostaglandin E2 (PGE2), which plays an important role in cytoprotection. In platelets, it is involved in the generation of thromboxane A2 (TXA2), which promotes platelet activation and aggregation, vasoconstriction and proliferation of vascular smooth muscle cells (Probable). Can also use linoleate (LA, (9Z,12Z)-octadecadienoate, C18:2(n-6)) as substrate and produce hydroxyoctadecadienoates (HODEs) in a regio- and stereospecific manner, being (9R)-HODE ((9R)-hydroxy-(10E,12Z)-octadecadienoate) and (13S)-HODE ((13S)-hydroxy-(9Z,11E)-octadecadienoate) its major products (By similarity)
Specific Function
heme binding
Gene Name
PTGS1
Uniprot ID
P23219
Uniprot Name
Prostaglandin G/H synthase 1
Molecular Weight
68685.82 Da
References
  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [Article]
  2. Zhou Y, Zhang Y, Zhao D, Yu X, Shen X, Zhou Y, Wang S, Qiu Y, Chen Y, Zhu F: TTD: Therapeutic Target Database describing target druggability information. Nucleic Acids Res. 2024 Jan 5;52(D1):D1465-D1477. doi: 10.1093/nar/gkad751. [Article]

Enzymes

Kind
Protein
Organism
Humans
Pharmacological action
Unknown
Actions
Inducer
General Function
A cytochrome P450 monooxygenase involved in the metabolism of endocannabinoids and steroids (PubMed:12865317, PubMed:21289075). Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (NADPH--hemoprotein reductase). Catalyzes the epoxidation of double bonds of arachidonoylethanolamide (anandamide) to 8,9-, 11,12-, and 14,15-epoxyeicosatrienoic acid ethanolamides (EpETrE-EAs), potentially modulating endocannabinoid system signaling (PubMed:21289075). Hydroxylates steroid hormones, including testosterone at C-16 and estrogens at C-2 (PubMed:12865317, PubMed:21289075). Plays a role in the oxidative metabolism of xenobiotics, including plant lipids and drugs (PubMed:11695850, PubMed:22909231). Acts as a 1,4-cineole 2-exo-monooxygenase (PubMed:11695850)
Specific Function
anandamide 11,12 epoxidase activity
Gene Name
CYP2B6
Uniprot ID
P20813
Uniprot Name
Cytochrome P450 2B6
Molecular Weight
56277.81 Da
References
  1. Saussele T, Burk O, Blievernicht JK, Klein K, Nussler A, Nussler N, Hengstler JG, Eichelbaum M, Schwab M, Zanger UM: Selective induction of human hepatic cytochromes P450 2B6 and 3A4 by metamizole. Clin Pharmacol Ther. 2007 Sep;82(3):265-74. doi: 10.1038/sj.clpt.6100138. Epub 2007 Mar 7. [Article]
Kind
Protein
Organism
Humans
Pharmacological action
Unknown
Actions
Inducer
General Function
A cytochrome P450 monooxygenase involved in the metabolism of sterols, steroid hormones, retinoids and fatty acids (PubMed:10681376, PubMed:11093772, PubMed:11555828, PubMed:12865317, PubMed:14559847, PubMed:15373842, PubMed:15764715, PubMed:19965576, PubMed:20702771, PubMed:21490593, PubMed:21576599). Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (NADPH--hemoprotein reductase). Catalyzes the hydroxylation of carbon-hydrogen bonds (PubMed:12865317, PubMed:14559847, PubMed:15373842, PubMed:15764715, PubMed:21490593, PubMed:21576599, PubMed:2732228). Exhibits high catalytic activity for the formation of hydroxyestrogens from estrone (E1) and 17beta-estradiol (E2), namely 2-hydroxy E1 and E2, as well as D-ring hydroxylated E1 and E2 at the C-16 position (PubMed:11555828, PubMed:12865317, PubMed:14559847). Plays a role in the metabolism of androgens, particularly in oxidative deactivation of testosterone (PubMed:15373842, PubMed:15764715, PubMed:22773874, PubMed:2732228). Metabolizes testosterone to less biologically active 2beta- and 6beta-hydroxytestosterones (PubMed:15373842, PubMed:15764715, PubMed:2732228). Contributes to the formation of hydroxycholesterols (oxysterols), particularly A-ring hydroxylated cholesterol at the C-4beta position, and side chain hydroxylated cholesterol at the C-25 position, likely contributing to cholesterol degradation and bile acid biosynthesis (PubMed:21576599). Catalyzes bisallylic hydroxylation of polyunsaturated fatty acids (PUFA) (PubMed:9435160). Catalyzes the epoxidation of double bonds of PUFA with a preference for the last double bond (PubMed:19965576). Metabolizes endocannabinoid arachidonoylethanolamide (anandamide) to 8,9-, 11,12-, and 14,15-epoxyeicosatrienoic acid ethanolamides (EpETrE-EAs), potentially modulating endocannabinoid system signaling (PubMed:20702771). Plays a role in the metabolism of retinoids. Displays high catalytic activity for oxidation of all-trans-retinol to all-trans-retinal, a rate-limiting step for the biosynthesis of all-trans-retinoic acid (atRA) (PubMed:10681376). Further metabolizes atRA toward 4-hydroxyretinoate and may play a role in hepatic atRA clearance (PubMed:11093772). Responsible for oxidative metabolism of xenobiotics. Acts as a 2-exo-monooxygenase for plant lipid 1,8-cineole (eucalyptol) (PubMed:11159812). Metabolizes the majority of the administered drugs. Catalyzes sulfoxidation of the anthelmintics albendazole and fenbendazole (PubMed:10759686). Hydroxylates antimalarial drug quinine (PubMed:8968357). Acts as a 1,4-cineole 2-exo-monooxygenase (PubMed:11695850). Also involved in vitamin D catabolism and calcium homeostasis. Catalyzes the inactivation of the active hormone calcitriol (1-alpha,25-dihydroxyvitamin D(3)) (PubMed:29461981)
Specific Function
1,8-cineole 2-exo-monooxygenase activity
Gene Name
CYP3A4
Uniprot ID
P08684
Uniprot Name
Cytochrome P450 3A4
Molecular Weight
57342.67 Da
References
  1. Saussele T, Burk O, Blievernicht JK, Klein K, Nussler A, Nussler N, Hengstler JG, Eichelbaum M, Schwab M, Zanger UM: Selective induction of human hepatic cytochromes P450 2B6 and 3A4 by metamizole. Clin Pharmacol Ther. 2007 Sep;82(3):265-74. doi: 10.1038/sj.clpt.6100138. Epub 2007 Mar 7. [Article]

Drug created at September 11, 2007 20:09 / Updated at March 26, 2025 14:34