Didn't work as expected after Maropitant (Cerenia) in cats

The FDA has received 479 reports of didn't work as expected in cats after Maropitant. That is 12% of all reports for this medicine, compared with 8.7% across reports for all cat medicines.

479Reports

41%Marked serious

13%Recovered

16%Died or euthanised

1 daysTypical onset

How soon it started

Same day

148 40%

1–2 days

51 14%

3–7 days

46 13%

1–4 weeks

62 17%

Over a month

61 17%

How the animals did

Recovered

63 13%

Still unwell when reported

177 37%

Died

30 6.3%

Euthanised

45 9.4%

Not known

164 34%

Problems reported at the same time

171 36%

137 29%

98 20%

73 15%

50 10%

45 9.4%

42 8.8%

39 8.1%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

167

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 didn't work as expected in cats?: 479 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).

Didn't work as expected with similar medicines

Didn't work as expected after Mirtazapine (Mirataz) 307 reports · 16% of its reports
Didn't work as expected after Capromorelin (Entyce) 121 reports · 15% of its reports

All reported side effects of Maropitant in cats · Medicines most reported with didn't work as expected