Vocalising after Methimazole in cats

85 reports to the FDA describe vocalising in cats given Methimazole. That is 4.8% of all reports for this medicine, compared with 3.1% across reports for all cat medicines, so it is reported unusually often with this medicine.

85Reports

55%Marked serious

27%Recovered

21%Died or euthanised

14 daysTypical onset

How soon it started

Same day

15 23%

1–2 days

2 3.0%

3–7 days

6 9.1%

1–4 weeks

15 23%

Over a month

28 42%

How the animals did

Recovered

21 25%

Recovered with lasting effects

2 2.4%

Still unwell when reported

25 29%

Died

8 9.4%

Euthanised

10 12%

Not known

19 22%

Problems reported at the same time

29 34%

22 26%

20 24%

18 21%

17 20%

17 20%

16 19%

Restlessness or agitation

13 15%

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 vocalising in cats?: 85 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 14 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).

Vocalising with similar medicines

Vocalising after Velagliflozin (Senvelgo) 29 reports · 0.6% of its reports
Vocalising after Bexagliflozin (Bexacat) 39 reports · 1.0% of its reports
Vocalising after Insulin 94 reports · 2.5% of its reports

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