Key product information

• Purpose: Used for long-term management or to stabilize a cat's thyroid.
• Active ingredient: Methimazole (also known as thiamazole).
• Available strengths: It typically comes in 1.25 mg, 2.5 mg, and 5 mg sugar-coated tablets.
• Administration rule: Tablets must be given whole and should never be broken or crushed, as the outer coating prevents human exposure to the medication during handling.

Common side effects
Most side effects occur within the first few weeks of starting treatment and can include:

• Vomiting or diarrhea
• Loss of appetite (anorexia)
• Lethargy or depression
• Facial scratching (pruritus)

Safety Warnings

• Human Safety: Thiamazole is a suspected human teratogen; pregnant or lactating women must wear single-use gloves when handling the medicine, treated cat litter, or vomit.
• Cat Safety: Do not use in cats with primary liver disease, diabetes mellitus, or certain blood disorders.