Leukocytosis after Maropitant (Cerenia) in dogs

70 reports to the FDA describe leukocytosis in dogs given Maropitant. That is 0.6% of all reports for this medicine, compared with 0.0% across reports for all dog medicines, so it is reported unusually often with this medicine.

70Reports

93%Marked serious

10%Recovered

41%Died or euthanised

2 daysTypical onset

How soon it started

Same day

18 30%

1–2 days

13 21%

3–7 days

9 15%

1–4 weeks

3 4.9%

Over a month

18 30%

How the animals did

Recovered

7 10%

Still unwell when reported

26 37%

Died

7 10%

Euthanised

22 31%

Not known

8 11%

Problems reported at the same time

52 74%

44 63%

43 61%

41 59%

40 57%

34 49%

32 46%

29 41%

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 leukocytosis in dogs?: 70 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 2 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).

Leukocytosis with similar medicines

Leukocytosis after Capromorelin (Entyce) 20 reports · 1.3% of its reports

All reported side effects of Maropitant in dogs · Medicines most reported with leukocytosis