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In some countries, this medicine may only be approved for veterinary use.



ATC (Anatomical Therapeutic Chemical Classification)


CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Categories

Antithyroid agent

Imidazole derivative

Chemical Names

1-Metyl-1,3-dihydro-2H-imidazole-2-tione (Ph. Eur.)

1-Metyl-2-mercaptoimidazole (WHO)

1-Metylimidazole-2-tiol (BAN)

2H-Imidazole-2-tione, 1,3-dihydro-1-metyl- (USAN)

Foreign Names

  • Thiamazolum (Latin)
  • Thiamazol (German)
  • Thiamazol (French)
  • Tiamazol (Spanish)

Generic Names

  • Thiamazole (OS: BAN, JAN, DCF)
  • Tiamazolo (OS: DCIT)
  • Mercazolyl (IS)
  • Methimazole (IS)
  • Methylmercaptoimidazole (IS)
  • Methymazole (IS)
  • NSC 38608 (IS)
  • UNII-554Z48XN5E (IS)
  • Methimazole (PH: USP 37)
  • Metimazolo (PH: F.U. IX)
  • Thiamazole (PH: BP 2015, JP XVI, Ph. Eur. 8)
  • Thiamazolum (PH: Ph. Eur. 8)

Brand Names

  • Athyrazol
    Jadran, Bosnia & Herzegowina; Jadran, Croatia (Hrvatska); Salus, Slovenia
  • Based
    Panion & BF, Taiwan
  • Bromazolo (Thiamazole and Dibromotyrosine)
    Baldacci, Italy
  • Favistan
    Bosnalijek, Bosnia & Herzegowina; Temmler, Germany
  • Felidale (veterinary use)
    Dechra, United Kingdom; Dechra, Ireland; Dechra, Netherlands
  • Felimazole (veterinary use)
    Dechra, Austria; Dechra, Finland; Dechra, United Kingdom; Dechra, Ireland; Dechra, Netherlands; Dechra, Norway; Dechra, Sweden; Dechra Veterinary Products, Belgium; Dechra Veterinary Products, France; Dermcare-Vet, Australia; Lilly, Italy; MSD Animal Health, Switzerland; Selecta, Germany
  • Ganglioside
    Armstrong, Mexico
  • Hontan
    Ying Yuan, Taiwan
  • Jia Qi Ya
    Qilu, China
  • Lica
    Swiss Pharm, Taiwan
  • Mercaptizol
    Taro, Israel
  • Mercazole
    Chugai Pharmaceutical, Japan
  • Mercazolyl-Zdorovye
    Zdorovie, Georgia
  • Methimazole Johnson
    Johnson, Taiwan
  • Methimazole Yung Shin
    Yung Shin, Thailand
  • Methizol
    Update, Taiwan
  • Methizol SD
    mibe, Germany
  • Metibasol
    Sanóbia, Portugal
  • Metimazol
    Lafrancol, Colombia
  • Metizol
    ICN, Bulgaria; ICN, Poland; SIA Meda Pharma, Lithuania
  • Metlina
    Metlen, Colombia
  • Metothyrin
    PannonPharma, Hungary
  • Northyx
    Centrix, United States
  • Strumazol
    Organon, Netherlands; Organon, Philippines; Takeda, Belgium
  • Tab-Zole
    Swiss Export, Lebanon
  • Tapazol
    Biolabfarma, Brazil; Grupo Farma, Colombia; Grupo Farma, Ecuador; Siegfried, Mexico; Cipa, Peru
  • Tapazole
    A. Menarini, Philippines; DKSH, Thailand; Monarch, United States; Paladin, Canada; Pharmaline, Lebanon; Teofarma, Italy
  • Tapdin
    MedChoice, Philippines
  • Thacapzol
    Recip, Sweden
  • Thiafeline (veterinary use)
    AST, Netherlands; Le Vet Beheer, Ireland
  • Thiamazol Aristo
    Aristo Pharma, Germany
  • Thiamazol Henning
    Henning Berlin, Germany
  • Thiamazol HEXAL
    Hexal, Germany
  • Thiamazol Lindopharm
    Aristo Pharma, Germany
  • Thiamazol Sandoz
    Sandoz, Austria
  • Thiamazole Merck
    Merck, Lithuania
  • Thimazol
    Shun Hwa, Taiwan
  • Thycapzol
    Sandoz, Denmark
  • Thyromazol
    Abdi Ibrahim, Turkey
  • Thyrozol
    Merck, Chile; Merck, Czech Republic; Merck, Estonia; Merck, Indonesia; Merck, Lithuania; Merck, Poland; Merck, Romania; Merck, Serbia; Merck, Singapore; Merck KGaA, Latvia; Merck KGaA, Vietnam; Merck Serono, China; Merck Serono, Germany; Merck Serono, France; Merck Serono, Russian Federation; Serono, Tunisia; Merck, Peru
  • Tiarotec
    Tecnofarma, Mexico
  • Tiastat
    Bosnalijek, Serbia
  • Timazol
    Sriprasit, Malaysia; Sriprasit Pharma, Thailand
  • Tirodril
    Estedi, Spain
  • Tirozol
    Merck, Georgia
  • Unimazole
    Uni-Pharma, Greece

International Drug Name Search


BANBritish Approved Name
DCFDénomination Commune Française
DCITDenominazione Comune Italiana
ISInofficial Synonym
JANJapanese Accepted Name
OSOfficial Synonym
PHPharmacopoeia Name
Ph. Eur.European Pharmacopoeia
Rec.INNRecommended International Nonproprietary Name (World Health Organization)
USANUnited States Adopted Name
WHOWorld Health Organization

Click for further information on drug naming conventions and International Nonproprietary Names.

Important Notice: The international database is in BETA release. This means it is still under development and may contain inaccuracies. It is not intended as a substitute for the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of any medication in any country is safe, appropriate or effective for you. Consult with your healthcare professional before taking any medication.