Skin redness after Methimazole in cats

48 reports to the FDA describe skin redness in cats given Methimazole. That is 2.7% of all reports for this medicine, compared with 2.2% across reports for all cat medicines.

48Reports

48%Marked serious

27%Recovered

15%Died or euthanised

24 daysTypical onset

How soon it started

Same day

3 8.3%

1–2 days

2 5.6%

3–7 days

2 5.6%

1–4 weeks

16 44%

Over a month

13 36%

How the animals did

Recovered

12 25%

Recovered with lasting effects

1 2.1%

Still unwell when reported

9 19%

Died

1 2.1%

Euthanised

6 13%

Not known

19 40%

Problems reported at the same time

11 23%

11 23%

10 21%

10 21%

9 19%

7 15%

6 13%

5 10%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Methimazole treats an overactive thyroid in cats.

Questions owners ask

Can Methimazole cause skin redness in cats?: 48 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
How soon after a dose was it reported?: In half of the reports with dates, it started within 24 days of the first dose.
What should I do?: Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Skin redness with similar medicines

Skin redness after Insulin 26 reports · 0.7% of its reports

All reported side effects of Methimazole in cats · Medicines most reported with skin redness