Leucocytosis after Maropitant (Cerenia) in dogs

723 reports to the FDA describe leucocytosis in dogs given Maropitant. That is 6.1% of all reports for this medicine, compared with 1.0% across reports for all dog medicines, so it is reported unusually often with this medicine.

723Reports

75%Marked serious

7.6%Recovered

47%Died or euthanised

4 daysTypical onset

How soon it started

Same day

139 23%

1–2 days

117 20%

3–7 days

110 18%

1–4 weeks

120 20%

Over a month

112 19%

How the animals did

Recovered

53 7.3%

Recovered with lasting effects

2 0.3%

Still unwell when reported

242 33%

Died

134 19%

Euthanised

206 28%

Not known

86 12%

Problems reported at the same time

439 61%

434 60%

417 58%

353 49%

339 47%

311 43%

290 40%

283 39%

Age of the animals

Under 1 year

1–3 years

138

4–7 years

184

8–11 years

218

12+ years

100

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 leucocytosis in dogs?: 723 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 4 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).

Leucocytosis with similar medicines

Leucocytosis after Capromorelin (Entyce) 66 reports · 4.4% of its reports
Leucocytosis after Mirtazapine (Mirataz) 31 reports · 11% of its reports

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