Neutrophilia after Maropitant (Cerenia) in cats

The FDA has received 110 reports of neutrophilia in cats after Maropitant. That is 2.9% of all reports for this medicine, compared with 0.7% across reports for all cat medicines, so it is reported unusually often with this medicine.

110Reports

81%Marked serious

13%Recovered

30%Died or euthanised

1 daysTypical onset

How soon it started

Same day

36 38%

1–2 days

26 28%

3–7 days

12 13%

1–4 weeks

5 5.3%

Over a month

15 16%

How the animals did

Recovered

14 13%

Still unwell when reported

45 41%

Died

7 6.4%

Euthanised

26 24%

Not known

18 16%

Problems reported at the same time

72 65%

52 47%

45 41%

43 39%

43 39%

37 34%

33 30%

30 27%

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 neutrophilia in cats?: 110 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).

Neutrophilia with similar medicines

Neutrophilia after Mirtazapine (Mirataz) 38 reports · 2.0% of its reports

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