Hyperphosphataemia after Maropitant (Cerenia) in cats

The FDA has received 114 reports of hyperphosphataemia in cats after Maropitant. That is 3.0% of all reports for this medicine, compared with 1.0% across reports for all cat medicines, so it is reported unusually often with this medicine.

114Reports

84%Marked serious

5.3%Recovered

46%Died or euthanised

2 daysTypical onset

How soon it started

Same day

24 23%

1–2 days

31 30%

3–7 days

19 18%

1–4 weeks

17 16%

Over a month

14 13%

How the animals did

Recovered

6 5.3%

Still unwell when reported

43 38%

Died

15 13%

Euthanised

38 33%

Not known

12 11%

Problems reported at the same time

103 90%

69 61%

53 46%

50 44%

41 36%

35 31%

30 26%

27 24%

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 hyperphosphataemia in cats?: 114 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 2 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).

Hyperphosphataemia with similar medicines

Hyperphosphataemia after Mirtazapine (Mirataz) 22 reports · 1.2% of its reports

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