Nystagmus after Maropitant (Cerenia) in dogs

The FDA has received 192 reports of nystagmus in dogs after Maropitant. That is 1.6% of all reports for this medicine, compared with 0.3% across reports for all dog medicines, so it is reported unusually often with this medicine.

192Reports

76%Marked serious

16%Recovered

26%Died or euthanised

Same dayTypical onset

How soon it started

Same day

80 54%

1–2 days

24 16%

3–7 days

13 8.7%

1–4 weeks

14 9.4%

Over a month

18 12%

How the animals did

Recovered

29 15%

Recovered with lasting effects

1 0.5%

Still unwell when reported

77 40%

Died

24 13%

Euthanised

25 13%

Not known

36 19%

Problems reported at the same time

Wobbliness (ataxia)

79 41%

Vomiting

77 40%

Loss of appetite

65 34%

Head tilt - ear disorder

53 28%

49 26%

47 24%

41 21%

37 19%

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 nystagmus in dogs?: 192 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 the same 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).

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