Not drinking after Methimazole in cats

42 reports to the FDA describe not drinking in cats given Methimazole. That is 2.4% of all reports for this medicine, compared with 1.1% across reports for all cat medicines, so it is reported unusually often with this medicine.

42Reports

79%Marked serious

21%Recovered

26%Died or euthanised

14 daysTypical onset

How soon it started

Same day

7 23%

1–2 days

2 6.5%

3–7 days

3 9.7%

1–4 weeks

10 32%

Over a month

9 29%

How the animals did

Recovered

9 21%

Still unwell when reported

11 26%

Died

5 12%

Euthanised

6 14%

Not known

11 26%

Problems reported at the same time

38 90%

25 60%

12 29%

12 29%

10 24%

8 19%

8 19%

8 19%

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 not drinking in cats?: 42 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).

Not drinking with similar medicines

Not drinking after Velagliflozin (Senvelgo) 30 reports · 0.6% of its reports
Not drinking after Bexagliflozin (Bexacat) 55 reports · 1.4% of its reports
Not drinking after Insulin 30 reports · 0.8% of its reports

All reported side effects of Methimazole in cats · Medicines most reported with not drinking