Thanks for your question. I'm sorry to hear about your cat’s reaction to methimazole. Managing hyperthyroidism in cats can be tricky, especially when dealing with medication sensitivities. Methimazole is commonly prescribed for hyperthyroidism, but some cats do have adverse reactions, which can range from mild side effects like vomiting or decreased appetite to more severe reactions such as liver problems or blood disorders.
Since you've identified a reaction to the medication, it's important to stop administering it and consult a veterinarian for guidance on alternative treatments. There are other options available, such as a prescription-only diet formulated to manage hyperthyroidism or considering radioiodine therapy, which can be curative.
In the meantime, make sure your cat stays comfortable and hydrated. Monitor their behavior and appetite closely. Watch for signs of a serious issue, such as persistent vomiting, significant weight loss, jaundice (yellowing of the skin or eyes), or very rapid heart rate, and seek emergency care if any of these occur.
I recommend booking a video consult with Dial A Vet so we can discuss the situation in more detail and find the best management plan for your feline friend. Having a personalized approach will ensure your cat gets back to feeling its best!
June 26, 2025
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