Diarrhea after Maropitant (Cerenia) in cats

The FDA has received 340 reports of diarrhea in cats after Maropitant. That is 8.8% of all reports for this medicine, compared with 5.1% across reports for all cat medicines, so it is reported unusually often with this medicine.

340Reports

65%Marked serious

21%Recovered

18%Died or euthanised

1 daysTypical onset

How soon it started

Same day

119 40%

1–2 days

65 22%

3–7 days

47 16%

1–4 weeks

34 11%

Over a month

36 12%

How the animals did

Recovered

71 21%

Still unwell when reported

150 44%

Died

27 7.9%

Euthanised

33 9.7%

Not known

59 17%

Problems reported at the same time

186 55%

181 53%

132 39%

65 19%

60 18%

59 17%

58 17%

Didn't work as expected

50 15%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

116

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 diarrhea in cats?: 340 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).

Diarrhea with similar medicines

Diarrhea after Mirtazapine (Mirataz) 124 reports · 6.6% of its reports
Diarrhea after Capromorelin (Entyce) 38 reports · 4.6% of its reports

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