Eosinopenia after Maropitant (Cerenia) in cats

51 reports to the FDA describe eosinopenia in cats given Maropitant. That is 1.3% of all reports for this medicine, compared with 0.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

51Reports

84%Marked serious

20%Recovered

22%Died or euthanised

1 daysTypical onset

How soon it started

Same day

21 45%

1–2 days

7 15%

3–7 days

1 2.1%

1–4 weeks

14 30%

Over a month

4 8.5%

How the animals did

Recovered

10 20%

Still unwell when reported

16 31%

Died

9 18%

Euthanised

2 3.9%

Not known

14 27%

Problems reported at the same time

33 65%

30 59%

25 49%

21 41%

21 41%

19 37%

19 37%

18 35%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Maropitant prevents vomiting and motion sickness.

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

Questions owners ask

Can Maropitant cause eosinopenia in cats?: 51 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 1 day 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).

All reported side effects of Maropitant in cats · Medicines most reported with eosinopenia