Methimazole
- CAS No.
- 60-56-0
- Chemical Name:
- Methimazole
- Synonyms
- THIAMAZOLE;2-MERCAPTO-1-METHYLIMIDAZOLE;1-METHYL-1H-IMIDAZOLE-2-THIOL;1,3-dihydro-1-methyl-2H-Imidazole-2-thione;TAPAZOLE;Mercazole;Thiamazol;Thimazole;METHIAZOLE;1-Methyl-1H-iMidazole-2(3H)-thione
- CBNumber:
- CB9220870
- Molecular Formula:
- C4H6N2S
- Molecular Weight:
- 114.17
- MDL Number:
- MFCD00179321
- MOL File:
- 60-56-0.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Product description | Number | Pack Size | Price |
| Thiamazole European Pharmacopoeia (EP) Reference Standard | Y0000336 | 30 mg | $175 |
| Methimazole pharmaceutical secondary standard, certified reference material | PHR3037 | 500MG | $201 |
| 2-Mercapto-1-methylimidazole ≥99% | 301507 | 5g | $128 |
| Methimazole United States Pharmacopeia (USP) Reference Standard | 1411005 | 200mg | $455 |
| 2-Mercapto-1-methylimidazole >98.0%(HPLC)(T) | M0868 | 25g | $107 |
| More product size | |||
| Melting point | 144-147 °C (lit.) |
|---|---|
| Boiling point | 280 °C |
| Density | 1.176 (estimate) |
| refractive index | 1.5000 (estimate) |
| Flash point | 280°C |
| storage temp. | 2-8°C |
| solubility | 200g/l |
| pka | 12.37±0.50(Predicted) |
| form | Crystalline Powder |
| color | White to slightly cream or pale buff |
| Water Solubility | soluble |
| Merck | 14,5971 |
| BRN | 108646 |
| InChI | 1S/C4H6N2S/c1-6-3-2-5-4(6)7/h2-3H,1H3,(H,5,7) |
| InChIKey | PMRYVIKBURPHAH-UHFFFAOYSA-N |
| SMILES | CN1C=CNC1=S |
| CAS DataBase Reference | 60-56-0(CAS DataBase Reference) |
| EWG's Food Scores | 1 |
| FDA UNII | 554Z48XN5E |
| Proposition 65 List | Methimazole |
| ATC code | H03BB02,H03BB52 |
| NIST Chemistry Reference | Methimazole(60-56-0) |
| IARC | 3 (Vol. 79) 2001 |
| EPA Substance Registry System | Methimazole (60-56-0) |
| UNSPSC Code | 41116107 |
| NACRES | NA.24 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |   GHS07,GHS08 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Warning | |||||||||
| Hazard statements | H302-H317-H319-H361fd | |||||||||
| Precautionary statements | P202-P280-P301+P312-P302+P352-P305+P351+P338-P308+P313 | |||||||||
| PPE | Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges | |||||||||
| Hazard Codes | Xn | |||||||||
| Risk Statements | 43-62-63-22 | |||||||||
| Safety Statements | 26-27-36-45-36/37 | |||||||||
| WGK Germany | 3 | |||||||||
| RTECS | NI8615000 | |||||||||
| TSCA | TSCA listed | |||||||||
| HS Code | 29332990 | |||||||||
| Storage Class | 11 - Combustible Solids | |||||||||
| Hazard Classifications | Acute Tox. 4 Oral Eye Irrit. 2 Repr. 2 Skin Sens. 1 |
|||||||||
| Hazardous Substances Data | 60-56-0(Hazardous Substances Data) | |||||||||
| REACH Registrations | Active | |||||||||
| NFPA 704 |
|
Methimazole price More Price(64)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | Y0000336 | Thiamazole European Pharmacopoeia (EP) Reference Standard | 60-56-0 | 30 mg | $175 | 2026-04-30 | Buy |
| Sigma-Aldrich | PHR3037 | Methimazole pharmaceutical secondary standard, certified reference material | 60-56-0 | 500MG | $201 | 2026-04-30 | Buy |
| Sigma-Aldrich | 301507 | 2-Mercapto-1-methylimidazole ≥99% | 60-56-0 | 5g | $128 | 2026-04-30 | Buy |
| Sigma-Aldrich | 1411005 | Methimazole United States Pharmacopeia (USP) Reference Standard | 60-56-0 | 200mg | $455 | 2026-04-30 | Buy |
| TCI Chemical | M0868 | 2-Mercapto-1-methylimidazole >98.0%(HPLC)(T) | 60-56-0 | 25g | $107 | 2026-04-30 | Buy |
Methimazole Chemical Properties,Uses,Production
description
Methimazole is an antithyroid medication used in the therapy of hyperthyroidism and Graves disease. It works by making it harder for the body to make thyroid hormone.
It is also known as thiamazole, is a thioamide and a thyroid hormone antagonist which acts by inhibiting the incorporation of iodine into tyrosyl residues of thyroglobulin and, thus, lowering thyroid hormone levels.
It resembles propylthiouracil both in chemical structure and activity.
Methimazole is primarily used for the treatment of hyperthyroidism, by inhibiting the peroxidase system, hindering thyroxine (T4) and tri-triiodothyronine (T3) synthesis, animal experiments show that it can inhibit B lymphocytes synthesizing antibodies, and reduce levels of thyroid stimulating antibodies in blood circulating it can make suppressing T cell function return to normal, it is applicable to hyperthyroidism caused by a variety of factors . Like other various drugs (propylthiouracil), it also has some adverse reactions while it is taken, Including hematologic adverse reactions, primarily neutropenia, hematopoietic dysfunction or disorder, thrombocytopenia, reduction of prothrombin or factor VII ; long-term medication can also cause liver damage,such as cholestatic jaundice and toxic hepatitis ; other skin reactions such as hair loss, itching, rash, dermatitis, lupus erythematosus, as well as some other rare adverse reactions. Also methimazole allows prothrombin time to prolong , and increases serum alkaline phosphatase, aspartate aminotransferase (AST) and alanine aminotransferase (ALT)and causes blood bilirubin and blood lactate dehydrogenase increasing. Therefore, patients in the medication should regularly take blood tests, liver function tests and peripheral blood leukocytes.
The above information is edited by the Chemicalbook of Tian Ye.
Chemical properties
leaf-shaped crystalline (ethanol), melting point 146-148 ℃, boiling point 280 ℃ (decomposition), soluble in water, soluble in alcohol, chloroform, slightly soluble in ether, benzene.
Uses
Carbimazole intermediates.
anti-thyroid drugs.
Production methods
React amino acetal with methyl isothiocyanate to genarate this product. The product can also be produced from thiocyanate and N-substituted amino acetal.
Chemical Properties
White Solid
Originator
Favistan ,Asta
Uses
Methimazole also directly disrupts thyroxine and triiodothyronin sysnthesis in the thyroid gland, and it is used for the same indications as propylthiouracil and methylthiouracil to treat hyperfunctioning thyroid glands in patients with Basedow’s disease.
Uses
2-Mercapto-1-methylimidazole was employed as hydrophobic charge-induction chromatography ligand for antibody purification. It was also used in preparation of nitrile functionalized methimazole-based room temperature ionic liquids.
Uses
Methimazole is a thiourea antithyroid agent that prevents iodine organification, thus inhibiting the synthesis of thyroxine. Antihyperthyroid
Definition
ChEBI: Methimazole is a member of the class of imidazoles that it imidazole-2-thione in which a methyl group replaces the hydrogen which is attached to a nitrogen. It has a role as an antithyroid drug.
Manufacturing Process
2 Methods of preparation of thiamazole:
1. To 2,2-diethoxyethylamine methylisothiocyanate was added and mixed after then 1-(2,2-diethoxy-ethyl)-3-methylthiourea was obtained.
The reaction of the 1-(2,2-diethoxyethyl)-3-methylthiourea with sulfuric acid yield thiamazole.
2. 1,1-Diethoxyethane was treated by bromine in the presence CaCO3 and 2- bromo-1,1-diethoxyethane was obtained.
Then to the 2-bromo-1,1-diethoxyethane methylamine was added, mixed and reaction mixture was heated to 120°-130°C in autoclave. As the result (2,2- diethoxyethyl)methylamine was obtained.
(2,2-Diethoxyethyl)methylamine reacted with potassium thiocyanate in the presence of hydrochloric acid and give the thiamazole, yellow crystallic precipitate, melting point 144°-147°C.
brand name
Tapazole (Jones); Tapazole (King) .
Therapeutic Function
Thyroid inhibitor
General Description
Methimazole, 1-methylimidazole-2-thiol (Tapazole), occurs as a white to off-white, crystallinepowder with a characteristic odor and is freely soluble inwater. A 2% aqueous solution has a pH of 6.7 to 6.9. It shouldbe packaged in well-closed, light-resistant containers.
Biochem/physiol Actions
Methimazole is a thiourea antithyroid agent that prevents iodine organification, thus inhibiting the synthesis of thyroxine.
Clinical Use
Methimazole is indicated in the treatment of hyperthyroidism.It is more potent than propylthiouracil. The side effectsare similar to those of propylthiouracil. As with otherantithyroid drugs, patients using this drug should be undermedical supervision. Also, like the other antithyroid drugs,methimazole is most effective if the total daily dose is subdividedand given at 8-hour intervals.
Safety Profile
Poison by subcutaneous route. Moderately toxic by ingestion and intraperitoneal routes. Human teratogenic effects. An experimental teratogen. Experimental reproductive effects. Questionable carcinogen with experimental neoplastigenic data. Human mutation data reported. An antithyroid drug. When heated to decomposition it emits very toxic fumes of NOx and SOx. See also MERCAPTANS.
Synthesis
Methimazole, 1-methyl-2-imidazolthiol (25.2.5), is synthesized by reacting aminoacetic aldehyde diethylacetal with methylisothiocyanate and subsequent hydrolysis of the acetal group of the resulting disubstituted urea derivative 25.2.4 by a solution of sulfuric acid, during which a simultaneous cyclization reaction takes place, forming the imidazole ring of the desired methimazole .
Veterinary Drugs and Treatments
Methimazole is considered by most clinicians to be the agent
of choice when using drugs to treat feline hyperthyroidism.
Propylthiouracil has significantly higher incidences of adverse
reactions
when compared to methimazole and is rarely used today.
Transdermal methimazole (in PLO gel; 2.5 mg twice daily) has been
used with some therapeutic success in cats that do not tolerate oral
dosing. Efficacy may require four or more weeks to detect. Studies
are ongoing.
Methimazole appears to be useful for the prophylactic prevention
of cisplatin induced nephrotoxicity in dogs.
Purification Methods
Crystallise it from EtOH. UV: at 251nm (H2O), 260nm (EtOH) and 267nm (CHCl3). [Lawson max & Morley J Chem Soc 1103 1956, Beilstein 24 H 17, 24 III/IV 61.]
References
[1] Patent: CN105541724, 2016, A. Location in patent: Paragraph 0029; 0031; 0032
Methimazole Preparation Products And Raw materials
Raw materials
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Preparation Products
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Wuhan Fortuna Chemical Co., Ltd | +86-27-59207850 | info@fortunachem.com | China | 5983 | 58 |
| Hebei Chuanghai Biotechnology Co., Ltd | +8615531151365 | mina@chuanghaibio.com | China | 18126 | 58 |
| Henan Suikang Pharmaceutical Co.,Ltd. | +86-18239973690 | sales@suikangpharm.com | China | 311 | 58 |
| Hebei Zhuanglai Chemical Trading Co Ltd | +86-16264648883 | niki@zlchemi.com | China | 7245 | 58 |
| Moxin Chemicals | +86-17320513646 +8617320513646 | anna@molcoo.com | China | 10000 | 58 |
| Henan Tianfu Chemical Co.,Ltd. | +86-0371-55170693 +86-19937530512 | info@tianfuchem.com | China | 21588 | 55 |
| Shanghai Time Chemicals CO., Ltd. | +86-021-57951555 +8617317452075 | jack.li@time-chemicals.com | China | 1803 | 55 |
| Nanjing ChemLin Chemical Industry Co., Ltd. | 025-83697070 | product@chemlin.com.cn | CHINA | 3009 | 60 |
| ATK CHEMICAL COMPANY LIMITED | +undefined-21-51877795 | ivan@atkchemical.com | China | 33024 | 60 |
| Hefei TNJ Chemical Industry Co.,Ltd. | +86-0551-65418679 +8618949832763 | info@tnjchem.com | China | 2988 | 55 |
Related articles
- Methimazole: an antithyroid medication
- Methimazole is an antithyroid medication which is now considered the first line agent for medical therapy of hyperthyroidism a....
- Apr 2，2025
View Lastest Price from Methimazole manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-05-29 | Methimazole
60-56-0
|
$56.00 | 99.21% | 10g | TargetMol Chemicals Inc. | ||
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2026-05-29 | Methimazole
60-56-0
|
$56.00 | 99.21% | 10g | TargetMol Chemicals Inc. | ||
 |
2026-05-29 | Methimazole
60-56-0
|
$56.00 | 99.21% | 10g | TargetMol Chemicals Inc. |
-
- Methimazole
60-56-0
- $56.00
- 99.21%
- TargetMol Chemicals Inc.
-
- Methimazole
60-56-0
- $56.00
- 99.21%
- TargetMol Chemicals Inc.
-
- Methimazole
60-56-0
- $56.00
- 99.21%
- TargetMol Chemicals Inc.
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