Decreased haematocrit after Maropitant (Cerenia) in cats

73 reports to the FDA describe decreased haematocrit in cats given Maropitant. That is 1.9% 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.

73Reports

75%Marked serious

5.5%Recovered

29%Died or euthanised

4 daysTypical onset

How soon it started

Same day

15 23%

1–2 days

13 20%

3–7 days

9 14%

1–4 weeks

8 12%

Over a month

20 31%

How the animals did

Recovered

4 5.5%

Still unwell when reported

34 47%

Died

5 6.8%

Euthanised

16 22%

Not known

14 19%

Problems reported at the same time

39 53%

35 48%

32 44%

25 34%

23 32%

21 29%

20 27%

19 26%

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 decreased haematocrit in cats?: 73 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).

Decreased haematocrit with similar medicines

Decreased haematocrit after Mirtazapine (Mirataz) 49 reports · 2.6% of its reports
Decreased haematocrit after Capromorelin (Entyce) 22 reports · 2.7% of its reports

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