2. Metabolic Enzyme/Protease
  3. Cytochrome P450
  4. Fomepizole

Fomepizole  (Synonyms: 4-Methylpyrazole)

Cat. No.: HY-B0876 Purity: 99.67%
COA Handling Instructions

Molarity Calculator

Fomepizole (4-Methylpyrazole) is a potent cytochrome P450 (CYP2E1) inhibitor. Fomepizole is a competitive inhibitor of the enzyme alcohol dehydrogenase. Fomepizole blocks further conversion of methanol and ethylene glycol to toxic metabolites. Fomepizole has the potential for an antidote for ethylene glycol or methanol poisoning.

For research use only. We do not sell to patients.

Fomepizole Chemical Structure

Fomepizole Chemical Structure

CAS No. : 7554-65-6

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10 mM * 1 mL in DMSO
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10 mM * 1 mL in DMSO USD 61 In-stock
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Based on 3 publication(s) in Google Scholar

Other Forms of Fomepizole:

Fomepizole Related Antibodies

Top Publications Citing Use of Products

View All Cytochrome P450 Isoform Specific Products:

View All Isoforms
CYP1 CYP2 CYP3 CYP4 CYP11 CYP17 Aromatase/CYP19A1 CYP26 CYP51 CYP2D6 CYP3A4 CYP17A1

  • Biological Activity

  • Purity & Documentation

  • References

  • Customer Review

Description

Fomepizole (4-Methylpyrazole) is a potent cytochrome P450 (CYP2E1) inhibitor. Fomepizole is a competitive inhibitor of the enzyme alcohol dehydrogenase. Fomepizole blocks further conversion of methanol and ethylene glycol to toxic metabolites. Fomepizole has the potential for an antidote for ethylene glycol or methanol poisoning[1][2][3].

IC50 & Target[3]

CYP2E1

 

In Vivo

Pretreatment with Fomepizole (4-Methylpyrazole; 25 mg/kg; IP) prolongs ethanol neurobehavioral toxicity in CD-1 mice[4]

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Model: Male CD-1 mice weighing 18-25 g[4]
Dosage: 25 mg/kg
Administration: IP; single dose
Result: Decreased the dose of ethanol (1-5 g/kg; IP) at which 50% of the animals failed a particular outcome test (toxic dose 50; TD50).
Clinical Trial
Molecular Weight

82.10

Formula

C4H6N2
CAS No.
Appearance

<13°C Solid,>13°C Liquid

Color

Off-white to light yellow

SMILES

CC1=CNN=C1
Shipping

Room temperature in continental US; may vary elsewhere.
Storage
Pure form -20°C 3 years
4°C 2 years
In solvent -80°C 6 months
-20°C 1 month
Solvent & Solubility
In Vitro: 

H2O : 100 mg/mL (1218.03 mM; Need ultrasonic)

DMSO : ≥ 100 mg/mL (1218.03 mM; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

*"≥" means soluble, but saturation unknown.

Preparing
Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 12.1803 mL 60.9013 mL 121.8027 mL
5 mM 2.4361 mL 12.1803 mL 24.3605 mL
View the Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

  • Molarity Calculator

  • Dilution Calculator

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Mass
=
Concentration
×
Volume
×
Molecular Weight *

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start)

C1

×
Volume (start)

V1

=
Concentration (final)

C2

×
Volume (final)

V2

In Vivo:

Select the appropriate dissolution method based on your experimental animal and administration route.

For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for in vivo experiments, it is recommended to prepare freshly and use it on the same day.
The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.

  • Protocol 1

    Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

    Solubility: ≥ 2.5 mg/mL (30.45 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.

    Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.
  • Protocol 2

    Add each solvent one by one:  10% DMSO    90% (20% SBE-β-CD in Saline)

    Solubility: ≥ 2.5 mg/mL (30.45 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 900 μL 20% SBE-β-CD in Saline, and mix evenly.

    Preparation of 20% SBE-β-CD in Saline (4°C, storage for one week): 2 g SBE-β-CD powder is dissolved in 10 mL Saline, completely dissolve until clear.

For the following dissolution methods, please prepare the working solution directly. It is recommended to prepare fresh solutions and use them promptly within a short period of time.
The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.

  • Protocol 1

    Add each solvent one by one:  PBS

    Solubility: 140 mg/mL (1705.24 mM); Clear solution; Need ultrasonic

In Vivo Dissolution Calculator
Please enter the basic information of animal experiments:

Dosage

mg/kg

Animal weight
(per animal)

g

Dosing volume
(per animal)

μL

Number of animals

Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
Calculation results:
Working solution concentration: mg/mL
This product has good water solubility, please refer to the measured solubility data in water/PBS/Saline for details.
The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only.If necessary, please contact MedChemExpress (MCE).
Purity & Documentation

Purity: 99.67%

COA (250 KB) HNMR (115 KB) RP-HPLC (190 KB)

Handling Instructions (2659 KB)
References

Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

Optional Solvent Concentration Solvent Mass 1 mg 5 mg 10 mg 25 mg
H2O / DMSO 1 mM 12.1803 mL 60.9013 mL 121.8027 mL 304.5067 mL
5 mM 2.4361 mL 12.1803 mL 24.3605 mL 60.9013 mL
10 mM 1.2180 mL 6.0901 mL 12.1803 mL 30.4507 mL
15 mM 0.8120 mL 4.0601 mL 8.1202 mL 20.3004 mL
20 mM 0.6090 mL 3.0451 mL 6.0901 mL 15.2253 mL
25 mM 0.4872 mL 2.4361 mL 4.8721 mL 12.1803 mL
30 mM 0.4060 mL 2.0300 mL 4.0601 mL 10.1502 mL
40 mM 0.3045 mL 1.5225 mL 3.0451 mL 7.6127 mL
50 mM 0.2436 mL 1.2180 mL 2.4361 mL 6.0901 mL
60 mM 0.2030 mL 1.0150 mL 2.0300 mL 5.0751 mL
80 mM 0.1523 mL 0.7613 mL 1.5225 mL 3.8063 mL
100 mM 0.1218 mL 0.6090 mL 1.2180 mL 3.0451 mL

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

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Fomepizole Related Classifications

Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

Keywords:

Fomepizole7554-65-64-MethylpyrazoleCytochrome P450CYPsalcoholdehydrogenasemethanolethyleneglycolantidoteInhibitorinhibitorinhibit

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