Weakness after Maropitant (Cerenia) in cats

120 reports to the FDA describe weakness in cats given Maropitant. That is 3.1% of all reports for this medicine, compared with 1.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

120Reports

80%Marked serious

9.2%Recovered

42%Died or euthanised

1 daysTypical onset

How soon it started

Same day

41 38%

1–2 days

29 27%

3–7 days

12 11%

1–4 weeks

12 11%

Over a month

15 14%

How the animals did

Recovered

11 9.2%

Still unwell when reported

39 33%

Died

16 13%

Euthanised

34 28%

Not known

20 17%

Problems reported at the same time

54 45%

54 45%

50 42%

36 30%

35 29%

34 28%

26 22%

24 20%

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 weakness in cats?: 120 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).

Weakness with similar medicines

Weakness after Mirtazapine (Mirataz) 60 reports · 3.2% of its reports
Weakness after Capromorelin (Entyce) 32 reports · 3.9% of its reports

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