Blood problems after Mirtazapine (Mirataz) in cats

106 reports to the FDA describe blood problems in cats given Mirtazapine. That is 5.6% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

106Reports

83%Marked serious

8.5%Recovered

34%Died or euthanised

7 daysTypical onset

How soon it started

Same day

12 13%

1–2 days

24 25%

3–7 days

16 17%

1–4 weeks

30 32%

Over a month

13 14%

How the animals did

Recovered

9 8.5%

Still unwell when reported

45 42%

Died

7 6.6%

Euthanised

29 27%

Not known

16 15%

Problems reported at the same time

70 66%

49 46%

48 45%

36 34%

36 34%

31 29%

30 28%

30 28%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Mirtazapine stimulates appetite (cats: ointment applied to the ear).

Products with this ingredient include Mirataz. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Questions owners ask

Can Mirtazapine cause blood problems in cats?: 106 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 7 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).

Blood problems with similar medicines

Blood problems after Maropitant (Cerenia) 244 reports · 6.3% of its reports
Blood problems after Capromorelin (Entyce) 38 reports · 4.6% of its reports

All reported side effects of Mirtazapine in cats · Medicines most reported with blood problems